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INTERSTATE STANDARD

BUILDING SOLUTIONS

TEST METHODS

Moscow
Standardinform
2010

INTERSTATE STANDARD

BUILDING SOLUTIONS

Test methods

Mortars. Test methods.

GOST
5802-86

Date of introduction 07/01/86

This standard applies to mortar mixtures and mortars made with mineral binders (cement, lime, gypsum, soluble glass) used in all types of construction, except hydraulic engineering.

The standard establishes methods for determining the following properties of a mortar mixture and solution:

Mobility, average density, delamination, water-holding capacity, water separation of the mortar mixture;

The standard does not apply to heat-resistant, chemical-resistant and stress-resistant solutions.

1. GENERAL REQUIREMENTS

1.1. Determination of mobility, density of the mortar mixture and compressive strength of the mortar is mandatory for all types of mortar. Other properties of mortar mixtures and mortar are determined in cases provided for by the project or work rules.

1.2. Samples for testing the mortar mixture and making samples are taken before the mortar mixture begins to set.

1.3. Samples should be taken from the mixer at the end of the mixing process, at the place of application of the solution from Vehicle or workbox.

Samples are taken from at least three places at different depths.

The sample volume must be at least 3 liters.

1.4. The selected sample must be additionally mixed for 30 s before testing.

1.5. Testing of the mortar mixture must begin no later than 10 minutes after sampling.

1.6. Testing of hardened solutions is carried out on samples. The shape and dimensions of the samples, depending on the type of test, must correspond to those indicated in the table. 1.

Table 1

Note. During production control of mortars, which are simultaneously subject to requirements for tensile strength in bending and compression, it is allowed to determine the compressive strength of the mortar by testing halves of prism samples obtained after bending testing of prism samples in accordance with GOST 310.4.

1.7. Deviation of dimensions of molded samples along the length of cube ribs and sides cross section prisms indicated in table. 1, should not exceed 0.7 mm.

1.8. Before molding samples internal surfaces forms cover thin layer lubricants

1.9. All samples must be labeled. The marking must be indelible and must not damage the sample.

1.10. The manufactured samples are measured with a caliper with an error of up to 0.1 mm.

1.11. In winter conditions, to test a solution with and without antifreeze additives, sampling and preparation of samples should be carried out at the place of its use or preparation, and the samples should be stored under the same temperature and humidity conditions in which the solution placed in the structure is located.

Specimens should be stored on the shelf of a locked storage box with mesh sides and a waterproof lid.

1.12. All measuring instruments and parameters of the vibrating platform should be checked within the time limits stipulated by the metrological services of Gosstandart.

1.13. The temperature of the room in which the tests are carried out should be (20 ± 2) °C, relative air humidity 50 - 70%.

The temperature and humidity of the room are measured with an MV-4 type aspiration psychrometer.

1.14. To test mortar mixtures and solutions, vessels, spoons, and other devices must be made of steel, glass or plastic.

The use of products made of aluminum or galvanized steel and wood is not allowed.

1.15. The compressive strength of mortar taken from masonry joints is determined according to the method given in Appendix 1.

The tensile strength of the solution during bending and compression is determined according to GOST 310.4.

The tensile strength of the solution during splitting is determined according to GOST 10180.

Adhesion strength is determined according to GOST 24992.

Shrinkage deformation is determined according to GOST 24544.

The water separation of the mortar mixture is determined according to GOST 10181.

1.16. The test results of samples of mortar mixtures and mortar samples are recorded in a journal, on the basis of which a document characterizing the quality is drawn up mortar.

2. DETERMINING THE MOBILITY OF THE MORTAR MIXTURE

2.1. The mobility of the mortar mixture is characterized by the depth of immersion of the reference cone into it, measured in centimeters.

2.2 . Equipment

2.2.1. For testing use:

Device for determining mobility (Fig. 1);

2.2.2. The reference cone of the device is made of sheet steel or plastic with a steel tip. The apex angle should be 30° ± 30′.

The mass of the reference cone with a rod should be (300 ± 2) g.

Device for determining the mobility of a mortar mixture

1 - tripod; 2 - scale; 3 - reference cone; 4 - rod; 5 - holders;
6 - guides; 7 - vessel for mortar mixture; 8 - locking screw

2.3 . Preparation for testing

2.3.1. All surfaces of the cone and vessel in contact with the mortar mixture should be cleaned of dirt and wiped with a damp cloth.

2.4 . Testing

2.4.1. The amount of immersion of the cone is determined in the sequence given below.

The device is installed on a horizontal surface and the freedom of sliding of the rod is checked. 4 in the guides 6 .

2.4.2. Vessel 7 fill with the mortar mixture 1 cm below its edges and compact it by pinching it with a steel rod 25 times and lightly tapping it 5-6 times on the table, after which the vessel is placed on the platform of the device.

2.4.3. Cone tip 3 bring into contact with the surface of the solution in the vessel, secure the cone rod with a locking screw 8 and make the first reading on the scale. Then release the locking screw.

2.4.4. The cone should be immersed in the mortar mixture freely. The second reading is taken on the scale 1 minute after the cone begins to immerse.

2.4.5. The immersion depth of the cone, measured with an error of up to 1 mm, is determined as the difference between the first and second reading.

2.5 . Processing the results

2.5.1. The immersion depth of the cone is assessed based on the results of two tests on different samples of the mortar mixture of the same batch as the arithmetic average of them and is rounded.

2.5.2. The difference in the performance of private tests should not exceed 20 mm. If the difference turns out to be more than 20 mm, then the tests should be repeated on a new sample of the mortar mixture.

2.5.3. The test results are recorded in a journal in the form according to Appendix 2.

3. DETERMINATION OF THE DENSITY OF THE MORTAR MIXTURE

3.1. The density of the mortar mixture is characterized by the ratio of the mass of the compacted mortar mixture to its volume and is expressed in g/cm 3 .

3.2 . Equipment

3.2.1. For testing use:

Steel cylindrical vessel with a capacity of 1000 +2 ml (Fig. 2);

Steel cylindrical vessel

Steel rod with a diameter of 12 mm, a length of 300 mm;

* In the territory Russian Federation GOST R 53228-2008 is valid.

3.3

3.3.1. Before testing, the vessel is pre-weighed with an error of up to 2 g. Then it is filled with excess mortar mixture.

3.3.2. The mortar mixture is compacted by pinching it with a steel rod 25 times and lightly tapping it on the table 5 - 6 times.

3.3.3. After compaction, excess mortar mixture is cut off with a steel ruler. The surface is carefully leveled with the edges of the vessel. The walls of the measuring vessel are cleaned with a damp rag from any solution that has fallen on them. Then the vessel with the mortar mixture is weighed to the nearest 2 g.

3.4 . Processing the results

3.4.1. The density of the mortar mixture r, g/cm3, is calculated using the formula

Where m- mass of the measuring vessel with the mortar mixture, g;

m 1 - mass of the measuring vessel without mixture, g.

3.4.2. The density of a mortar mixture is determined as the arithmetic mean of the results of two determinations of the density of the mixture from one sample, differing from each other by no more than 5% from the lower value.

If there is a greater discrepancy between the results, the determination is repeated on a new sample of the solution mixture.

3.4.3. The test results must be recorded in a journal in the form according to Appendix 2.

4. DETERMINATION OF THE STREAMABILITY OF THE MORTAR MIXTURE

4.1. The stratification of the mortar mixture, which characterizes its cohesion under dynamic action, is determined by comparing the mass content of the filler in the lower and upper parts of a freshly molded sample with dimensions of 150 × 150 × 150 mm.

4.2 . Equipment

4.2.1. For testing use:

Steel forms with dimensions 150×150×150 mm according to GOST 22685;

Laboratory vibration platform type 435A;

Sieve with cells 0.14 mm;

Baking tray;

Steel rod with a diameter of 12 mm, a length of 300 mm.

4.2.2. The laboratory vibrating platform when loaded should provide vertical vibrations with a frequency of 2900 ± 100 per minute and an amplitude of (0.5 ± 0.05) mm. The vibrating platform must have a device that, when vibrating, provides rigid fastening of the form with the solution to the table surface.

4.3 . Testing

4.3.1. The mortar mixture is placed and compacted in a mold for control samples with dimensions of 150×150×150 mm. After this, the compacted mortar mixture in the mold is subjected to vibration on a laboratory vibration platform for 1 minute.

4.3.2. After vibration upper layer solution with a height of (7.5 ± 0.5) mm is taken from the mold onto a baking sheet, and the lower part of the sample is unloaded from the mold by tipping it onto a second baking sheet.

4.3.3. Selected samples of the mortar mixture are weighed with an error of up to 2 g and subjected to wet sieving on a sieve with 0.14 mm holes.

In wet sieving, individual parts of the sample placed on a sieve are washed with a jet clean water until the binder is completely removed. Washing the mixture is considered complete when clean water flows out of the sieve.

4.3.4. Washed portions of the filler are transferred to a clean baking sheet, dried to a constant weight at a temperature of 105 - 110 ° C and weighed with an error of up to 2 g.

4.4 . Processing the results

where D V- absolute value of the difference between the filler content in the upper and lower parts of the sample, %;

å V- total content of filler in the upper and lower parts of the sample, %.

4.4.3. The separation index for each sample of the mortar mixture is determined twice and calculated, rounded to 1%, as the arithmetic mean of the results of two determinations that differ from each other by no more than 20% from the lower value. If there is a greater discrepancy between the results, the determination is repeated on a new sample of the solution mixture.

4.4.4. The test results must be recorded in a journal indicating:

Test date and time;

Sampling location;

Brand and type of solution;

Results of particular determinations;

Arithmetic mean result.

5. DETERMINATION OF THE WATER RETENTION CAPACITY OF THE MORTAR MIXTURE

5.1. Water-holding capacity is determined by testing a 12 mm thick layer of mortar mixture laid on blotting paper.

5.2 . Equipment and materials

5.2.1. For testing use:

Sheets of blotting paper measuring 150×150 mm according to TU 13-7308001-758;

Gaskets made of gauze fabric measuring 250x350 mm according to GOST 11109;

Metal ring with an internal diameter of 100 mm, a height of 12 mm and a wall thickness of 5 mm;

Glass plate size 150×150 mm, thickness 5 mm;

A device for determining the water-holding capacity of a mortar mixture (Fig. 3).

5.3 . Preparation for testing and testing

5.3.1. Before testing, 10 sheets of blotting paper are weighed with an error of up to 0.1 g, placed on a glass plate, a gauze pad is placed on top, a metal ring is installed and weighed again.

5.3.2. The thoroughly mixed mortar mixture is placed flush with the edges of the metal ring, leveled, weighed and left for 10 minutes.

5.3.3. The metal ring with the solution is carefully removed along with the gauze.

The blotting paper is weighed with an error of up to 0.1 g.

Diagram of a device for determining the water-holding capacity of a mortar mixture

1 - metal ring with solution; 2 - 10 layers of blotting paper;
3 - glass plate; 4 - a layer of gauze fabric

5.4 . Processing the results

5.4.1. Water holding capacity of the mortar mixture V determined by the percentage of water content in the sample before and after the experiment using the formula

Where T 1 - mass of blotting paper before testing, g;

T 2 - mass of blotting paper after testing, g;

m 3 - weight of the installation without mortar mixture, g;

T 4 - weight of the installation with the mortar mixture, g.

5.4.2. The water-holding capacity of the mortar mixture is determined twice for each sample of the mortar mixture and is calculated as the arithmetic mean of the results of two determinations that differ from each other by no more than 20% from the lower value.

5.4.3. The test results must be recorded in a journal indicating:

Test date and time;

Sampling location;

Brand and type of mortar mixture;

Results of partial determinations and arithmetic mean result.

6. DETERMINATION OF COMPRESSIVE STRENGTH OF SOLUTION

6.1. The compressive strength of the mortar should be determined on cube samples with dimensions of 70.7 × 70.7 × 70.7 mm at the age specified in the standard or technical conditions for this type of solution. For each test period, three samples are made.

6.2. Sampling and general technical requirements for the method for determining compressive strength - according to paragraphs. 1.1 - 1.14 of this standard.

6.3 . Equipment

6.3.1. For testing use:

Split steel molds with and without pallet according to GOST 22685;

Kernel steel diameter 12 mm, length 300 mm;

Spatula (Fig. 4).

Spatula for compacting the mortar mixture

6.4 . Preparing for the test

6.4.1. Samples from the mortar mixture with a mobility of up to 5 cm should be made in molds with a tray.

The form is filled with the solution in two layers. The layers of mortar in each compartment of the mold are compacted with 12 pressures of a spatula: six pressures along one side and six - in a perpendicular direction.

Excess solution is cut off flush with the edges of the mold with a steel ruler moistened with water and the surface is smoothed.

6.4.2. Samples from the mortar mixture with a mobility of 5 cm or more are made in molds without a tray.

The form is placed on a brick covered with newsprint moistened with water or other unglued paper. The size of the paper should be such that it covers side faces bricks Before use, bricks must be ground manually one against another to eliminate sharp irregularities. The brick used is ordinary clay with a moisture content of no more than 2% and a water absorption of 10 - 15% by weight. Bricks with traces of cement on the edges cannot be reused.

6.4.3. The molds are filled with the mortar mixture at one time with some excess and compacted by pinning it with a steel rod 25 times along a concentric circle from the center to the edges.

6.4.4. In winter masonry conditions for testing solutions with and without anti-frost additives antifreeze additives for each test period and each controlled area, 6 samples are made, three of which are tested within the time period required for floor-by-floor control of the strength of the mortar after thawing for 3 hours at a temperature not lower than (20 ± 2) °C, and the remaining three samples are tested after their thawing and subsequent 28-day hardening at a temperature not lower than (20 ± 2) °C. The defrosting time must correspond to that indicated in the table. 2.

table 2

6.4.5. Forms filled with a mortar mixture on hydraulic binders are kept until stripping in a normal storage chamber at a temperature of (20 ± 2) °C and a relative humidity of 95 - 100%, and forms filled with a mortar mixture on air binders are kept in a room at a temperature ( 20 ± 2) °C and relative humidity (65 ± 10)%.

6.4.6. The samples are released from the molds 24 ± 2 hours after placing the mortar mixture.

Samples made from mortar mixtures prepared with slag Portland cements, pozzolanic Portland cements with additives as retarders, as well as samples of winter masonry stored at outdoors, released from molds after 2-3 days.

6.4.7. After release from molds, samples should be stored at (20 ± 2) °C. In this case, must be observed following conditions: samples from solutions prepared with hydraulic binders must be stored for the first 3 days in a normal storage chamber at a relative humidity of 95 - 100%, and the remaining time before testing - indoors at a relative humidity of (65 ± 10)% (from solutions that harden in air) or in water (from solutions that harden in a humid environment); samples from solutions prepared with air binders should be stored indoors at a relative air humidity of (65 ± 10)%.

6.4.8. In the absence of a normal storage chamber, it is allowed to store samples prepared with hydraulic binders in wet sand or sawdust.

6.4.9. When stored indoors, samples must be protected from drafts, heating by heating devices, etc.

6.4.10. Before the compression test (for subsequent determination of density), the samples are weighed with an error of up to 0.1% and measured with a caliper with an error of up to 0.1 mm.

6.4.11. Samples stored in water must be removed from it no earlier than 10 minutes before testing and wiped with a damp cloth.

Samples stored indoors should be cleaned with a hair brush.

6.5 . Carrying out the test

6.5.1. Before installing the sample on the press, the solution particles remaining from the previous test are carefully removed from the press support plates in contact with the edges of the sample.

6.5.2. The sample is placed on the bottom plate of the press centrally relative to its axis so that the base is the edges that came into contact with the walls of the mold during its manufacture.

6.5.3. The force measuring scale of a testing machine or press is selected from the condition that the expected value of the breaking load should be in the range of 20 - 80% of the maximum load allowed by the selected scale.

The type (brand) of the testing machine (press) and the selected scale of the force meter are recorded in the test log.

6.5.4. The load on the sample must increase continuously at a constant rate of (0.6 ± 0.4) MPa [(6 ± 4) kgf/cm2] per second until it fails.

The maximum force achieved during testing of the sample is taken as the magnitude of the breaking load.

6.6 . Processing the results

6.6.1. Compressive strength of mortar R calculated for each sample with an error of up to 0.01 MPa (0.1 kgf/cm 2) using the formula

A- working cross-sectional area of the sample, cm 2.

6.6.2. The working cross-sectional area of the samples is determined from the measurement results as the arithmetic mean of the areas of two opposite faces.

6.6.3. The compressive strength of the mortar is calculated as the arithmetic mean of the test results of three samples.

6.6.4. The test results are recorded in a journal in the form according to Appendix 2.

7. DETERMINATION OF AVERAGE DENSITY OF SOLUTION

7.1. The density of the solution is determined by testing cube samples with an edge of 70.7 mm, made from a mortar mixture of the working composition, or plates measuring 50x50 mm, taken from the seams of structures. The thickness of the plates must correspond to the thickness of the seam.

During production control, the density of solutions is determined by testing samples intended to determine the strength of the solution.

7.2. Samples are prepared and tested in batches. The series must consist of three samples.

7.3 . Equipment, materials

7.3.1. To carry out the test use:

Drying cabinet according to OST 16.0.801.397;

Anhydrous calcium chloride according to GOST 450 or sulfuric acid density 1.84 g/cm 3 according to GOST 2184;

7.4 . Preparing for the test

7.4.1. The density of the solution is determined by testing samples in a state of natural humidity or a normalized moisture state: dry, air-dry, normal, water-saturated.

7.4.2. When determining the density of a solution in a state of natural humidity, samples are tested immediately after taking them or stored in a vapor-tight package or sealed container, the volume of which is no more than 2 times the volume of the samples placed in it.

7.4.3. The density of a solution at a standardized humidity state is determined by testing samples of the solution having a standardized humidity or arbitrary humidity, followed by recalculating the results obtained to the standardized humidity using formula (7).

7.4.4. When determining the density of a solution in a dry state, the samples are dried to constant weight in accordance with the requirements of clause 8.5.1.

7.4.5. When determining the density of a solution in an air-dry state, before testing, the samples are kept for at least 28 days in a room at a temperature of (25 ± 10) °C and relative air humidity (50 ± 20)%.

7.4.6. When determining the density of a solution under normal humidity conditions, samples are stored for 28 days in a normal hardening chamber, desiccator or other sealed container at a relative air humidity of at least 95% and a temperature of (20 ± 2) °C.

7.4.7. When determining the density of a solution in a water-saturated state, the samples are saturated with water in accordance with the requirements of clause 9.4.

7.5 . Carrying out the test

7.5.1. The volume of samples is calculated from their geometric dimensions. The dimensions of the samples are determined with a caliper with an error of no more than 0.1 mm.

7.5.2. The mass of samples is determined by weighing with an error of no more than 0.1%.

7.6 . Processing the results

7.6.1. The density of the solution sample r w is calculated with an error of up to 1 kg/m 3 using the formula

where r w is the density of the solution at humidity W m, kgf/m 3 ;

W n - normalized humidity of the solution, %;

W m is the humidity of the solution at the time of testing, determined according to section. 8.

7.6.4. The test results must be recorded in a journal in the form according to Appendix 2.

8. DETERMINATION OF SOLUTION HUMIDITY

8.1. The moisture content of the solution is determined by testing samples or samples obtained by crushing samples after their strength testing or extracted from finished products or structures.

8.2. The largest size of crushed pieces of mortar should be no more than 5 mm.

8.3. Samples are crushed and weighed immediately after collection and stored in a vapor-tight package or sealed container, the volume of which is no more than twice the volume of the samples placed in it.

8.4 . Equipment and materials

8.4.1. For testing use:

Drying cabinet according to OST 16.0.801.397;

Baking trays;

8.5 . Testing

8.5.1. Prepared samples or samples are weighed and dried to constant weight at a temperature of (105 ± 5) °C.

Gypsum solutions are dried at a temperature of 45 - 55 °C.

The mass at which the results of two successive weighings differ by no more than 0.1% is considered constant. In this case, the time between weighings should be at least 4 hours.

8.5.2. Before reweighing, the samples are cooled in a desiccator with anhydrous calcium chloride or with drying cabinet to room temperature.

8.5.3. Weighing is carried out with an error of up to 0.1 g.

8.6 . Processing the results

8.6.1. Humidity of the solution by weight W m as a percentage is calculated with an error of up to 0.1% using the formula

where r o is the density of the dry solution, determined according to clause 7.6.1;

8.6.3. The moisture content of a solution of a series of samples is determined as the arithmetic mean of the results of determining the moisture content of individual samples of the solution.

8.6.4. The test results must be recorded in a journal indicating:

Place and time of sampling;

Humidity state of the solution;

Age of the solution and test date;

Sample marking;

Humidity of the solution of samples (samples) and series by weight;

Humidity of sample solution (samples) and series by volume.

9. DETERMINATION OF WATER ABSORPTION OF SOLUTION

9.1. The water absorption of the solution is determined by testing samples. The dimensions and number of samples are taken according to clause 7.1.

9.2 . Equipment and materials

9.2.1. For testing use:

Drying cabinet according to OST 16.0.801.397;

Container for saturating samples with water;

Wire brush or abrasive stone.

9.3 . Preparing for the test

9.3.1. The surface of the samples is cleaned of dust, dirt and traces of grease using a wire brush or an abrasive stone.

9.3.2. Samples are tested in a state of natural moisture or dried to constant weight.

9.4 . Carrying out the test

9.4.1. The samples are placed in a container filled with water so that the water level in the container is approximately 50 mm higher than the top level of the stacked samples.

The samples are placed on pads so that the height of the sample is minimal.

The water temperature in the container should be (20 ± 2) °C.

9.4.2. Samples are weighed every 24 hours of water absorption on conventional or hydrostatic balances with an error of no more than 0.1%.

When weighing on conventional scales, samples taken out of water are first wiped with a wrung-out damp cloth.

9.4.3. The test is carried out until the results of two consecutive weighings differ by no more than 0.1%.

9.4.4. Samples tested in a state of natural humidity, after completion of the water saturation process, are dried to constant weight according to clause 8.5.1.

9.5 . Processing the results

9.5.1. Water absorption of a solution of an individual sample by mass W m as a percentage is determined with an error of up to 0.1% using the formula

where r o is the density of the dry solution, kg/m 3 ;

r in - the density of water, taken equal to 1 g/cm 3.

9.5.3. The water absorption of a solution of a series of samples is determined as the arithmetic mean of the test results of individual samples in the series.

9.5.4. The journal in which test results are recorded must contain the following columns:

Marking of samples;

Age of the solution and date of testing;

Water absorption of sample solution;

Water absorption of sample series solution.

10. DETERMINATION OF FROST RESISTANCE OF SOLUTION

10.1. The frost resistance of a mortar is determined only in cases specified in the project.

Solutions of grades 4; 10 and solutions prepared with air binders are not tested for frost resistance.

10.2. The solution is tested for frost resistance by repeated alternate freezing of cube samples with an edge of 70.7 mm in a state of saturation with water at a temperature of minus 15 - 20 ° C and thawing them in water at a temperature of 15 - 20 ° C.

10.3. To carry out the test, six cube samples are prepared, of which three samples are frozen, and the remaining samples are control samples.

10.4. The grade of solution for frost resistance is taken to be greatest number cycles of alternating freezing and thawing, which the samples withstand during testing.

Mortar grades for frost resistance must be adopted in accordance with the requirements of current regulatory documentation.

10.5 . Equipment

10.5.1. For testing use:

Freezer with forced ventilation and automatic temperature control within the range of minus 15 - 20 ° C;

A container for saturating samples with water with a device that ensures that the temperature of the water in the vessel is maintained within the range of plus 15 - 20 °C;

Molds for making samples according to GOST 22685.

10 .6. Preparing for the test

10.6.1. The samples to be tested for frost resistance (the main ones) should be numbered, inspected, and any noticeable defects (minor chips on edges or corners, chipping, etc.) should be recorded in the test log.

10.6.2. The main samples must be tested for frost resistance at 28 days of age after being kept in a normal hardening chamber.

10.6.3. Control samples intended for compression testing must be stored in a normal hardening chamber at a temperature of (20 ± 2) °C and a relative humidity of at least 90%.

10.6.4. The main samples of the solution intended for testing for frost resistance and control samples intended for determining compressive strength at 28 days of age must be saturated with water before testing without preliminary drying by keeping them for 48 hours in water at a temperature of 15 - 20 ° WITH. In this case, the sample must be surrounded on all sides by a layer of water at least 20 mm thick. The saturation time in water is included in the total age of the solution.

10.7 . Carrying out the test

10.7.1. Basic samples saturated with water should be placed in the freezer in special containers or placed on mesh shelves. The distance between samples, as well as between samples and the walls of containers and overlying shelves, must be at least 50 mm.

10.7.2. Samples should be frozen in a freezing unit that allows the chamber with samples to be cooled and maintained at a temperature of minus 15 - 20 °C. The temperature should be measured at half the height of the chamber.

10.7.3. Samples should be loaded into the chamber after the air in it has cooled to a temperature not exceeding minus 15 °C. If, after loading the chamber, the temperature in it is higher than minus 15 °C, then the beginning of freezing should be considered the moment the air temperature reaches minus 15 °C.

10.7.4. The duration of one freezing must be at least 4 hours.

10.7.5. Samples after unloading from freezer must be thawed in a bath of water at a temperature of 15 - 20 ° C for 3 hours.

10.7.6. A control inspection of the samples should be carried out in order to terminate the frost resistance test of a series of samples in which the surface of two out of three samples has visible damage (delamination, through cracks, chipping).

10.7.7. After alternate freezing and thawing of the samples, the main samples should be tested for compression.

10.7.8. Compression samples should be tested in accordance with the requirements of Section. 6 of this standard.

10.7.9. Before the compression test, the main samples are inspected and the area of damage to the faces is determined.

If there are signs of damage to the supporting edges of the samples (peeling, etc.), before testing they should be leveled with a layer of quick-hardening composition no more than 2 mm thick. In this case, samples should be tested 48 hours after gravy, and the first day the samples should be stored in a humid environment, and then in water at a temperature of 15 - 20 ° C.

10.7.10. Control samples should be tested for compression in a water-saturated state before freezing the main samples. Before installation on the press, the supporting surfaces of the samples should be wiped with a damp cloth.

10.7.11. When assessing frost resistance by weight loss after the required number of freezing and thawing cycles, samples are weighed in a water-saturated state with an error of no more than 0.1%.

10.7.12. When assessing frost resistance by the degree of damage, samples are inspected every five cycles of alternating freezing and thawing. Samples are examined after thawing every five cycles.

10.8 . Processing the results

10.8.1. Frost resistance in terms of loss of compressive strength of samples during alternate freezing and thawing is assessed by comparing the strength of the main and control samples in a water-saturated state.

The loss of strength of samples D in percent is calculated using the formula

Where m 1 - mass of a sample saturated with water before testing it for frost resistance, g;

m 2 - mass of a sample saturated with water after testing it for frost resistance, g.

The weight loss of samples after testing for frost resistance is calculated as the arithmetic mean of the test results of three samples.

The permissible amount of weight loss for samples after alternate freezing and thawing is no more than 5%.

10.8.3. The logbook for testing samples for frost resistance must indicate the following data:

Type and composition of the solution, design grade for frost resistance;

Marking, date of manufacture and date of testing;

Dimensions and weight of each sample before and after testing and weight loss as a percentage;

Hardening conditions;

Description of defects found in samples before testing;

Description external signs destruction and damage after testing;

The compressive strength limits of each of the main and control samples and the percentage change in strength after the frost resistance test;

Number of freeze and thaw cycles.

ANNEX 1
Mandatory

DETERMINATION OF THE COMPRESSIVE STRENGTH OF THE SOLUTION TAKEN FROM THE JOINTS

1. The strength of the mortar is determined by testing the compression of cubes with ribs 2 - 4 cm, made of two plates taken from horizontal joints of masonry or joints of large-panel structures.

2. The plates are made in the form of a square, the side of which should be 1.5 times the thickness of the plate, equal to the thickness of the seam.

3. Gluing the mortar plates to obtain cubes with edges 2 - 4 cm and leveling their surfaces is done using a thin layer of gypsum dough (1 - 2 mm).

4. It is allowed to cut cube samples from plates in the case when the thickness of the plate provides the required rib size.

5. Samples should be tested one day after their manufacture.

6. Sample cubes made of mortar with ribs 3 - 4 cm long are tested according to clause 6.5 of this standard.

7. To test cube samples from a solution with ribs of 2 cm, as well as thawed solutions, a small-sized desktop press of the PS type is used. The normal load range is 1.0 - 5.0 kN (100 - 500 kgf).

8. The strength of the solution is calculated according to clause 6.6.1 of this standard. The strength of the solution should be determined as the arithmetic mean of the test results of five samples.

9. To determine the strength of the mortar in cubes with ribs of 7.07 cm, the test results of cubes of summer and winter mortars that hardened after thawing should be multiplied by the coefficient given in the table.

MAGAZINE
tests to determine mobility, average density
mortar mixture and compressive strength, medium density
solution samples

Brand of solution according to the passport

Recipient and address

Volume of solution, m 3

Mixture mobility, cm

Mixture density, g/cm 3

Density ratio

Sample size, cm

Age, days

Working area, cm 2

Sample weight, g

Sample density, solution, g/cm 3

Pressure gauge readings, N (kgf)

Strength of an individual sample, MPa (kgf/cm2)

Average strength in the series, MPa (kgf/cm 2)

Sample storage temperature, °C

Antifreeze additive

Notes

sampling

tests

Head of Laboratory ___________________________________________________

Responsible for production

and testing of samples ______________________________________________________________

* The “Notes” column should indicate sample defects: cavities, foreign inclusions and their locations, special nature of destruction, etc.

INFORMATION DATA 7.3.1, 8.4.1

OST 16.0.801.397-87

4.2.1, 7.3.1, 8.4.1, 9.2.1

TU 13-7308001-758-88

5. REPUBLICATION. October 2010

1. General requirements. 2

2. Determination of the mobility of the mortar mixture. 3

3. Determination of the density of the mortar mixture. 5

4. Determination of the stratification properties of the mortar mixture. 5

5. Determination of the water-holding capacity of the mortar mixture. 7

6. Determination of the compressive strength of the solution. 8

7. Determination of the average density of the solution. eleven

8. Determination of solution humidity. 12

9. Determination of water absorption of the solution. 13

10. Determination of frost resistance of the solution. 14

Appendix 1 (mandatory) Determination of the compressive strength of mortar taken from joints. 17

Resolution State Committee USSR Construction Affairs dated December 11, 1985 No. 214, the introduction date is set

01.07.86

This standard applies to mortar mixtures and mortars made with mineral binders (cement, lime, gypsum, soluble glass) used in all types of construction, except hydraulic engineering.

The standard establishes methods for determining the following properties of a mortar mixture and solution:

mobility, average density, delamination, water-holding capacity, water separation of the mortar mixture;

The standard does not apply to heat-resistant, chemical-resistant and stress-resistant solutions.

1. GENERAL REQUIREMENTS

1.8. Before molding the samples, the internal surfaces of the molds are coated with a thin layer of lubricant.

1.9. All samples must be labeled. The marking must be indelible and must not damage the sample.

1.10. The manufactured samples are measured with a caliper with an error of up to 0,1 mm.

1.11. In winter conditions, to test a solution with and without antifreeze additives, sampling and preparation of samples should be carried out at the place of its use or preparation, and the samples should be stored in the same temperature and humidity conditions in which the solution placed in the structure is located.

Specimens should be stored on the shelf of a locked storage box with mesh sides and a waterproof lid.

1.12. All measuring instruments and parameters of the vibrating platform should be checked within the time limits provided for by the metrological services of Gosstandart.

1.13. The temperature of the room in which the tests are carried out should be (20 ± 2) °C, relative air humidity 50-70%.

The temperature and humidity of the room are measured with an MV-4 type aspiration psychrometer.

1.14. To test mortar mixtures and solutions, vessels, spoons, and other devices must be made of steel, glass or plastic.

The use of products made of aluminum or galvanized steel and wood is not allowed.

1.15. The compressive strength of the mortar taken from the masonry joints is determined according to the method given in the Appendix.

The tensile strength of the solution during bending and compression is determined according to GOST 310.4-81.

The tensile strength of the solution during splitting is determined according to GOST 10180-90.

Adhesion strength is determined according to GOST 24992-81.

Shrinkage deformation is determined according to GOST 24544-81.

The water separation of the mortar mixture is determined according to GOST 10181.0-81.

1.16. The test results of samples of mortar mixtures and mortar samples are recorded in a journal, on the basis of which a document is drawn up characterizing the quality of the mortar.

2. DETERMINING THE MOBILITY OF THE MORTAR MIXTURE

2.1. The mobility of the mortar mixture is characterized by the depth of immersion of the reference cone into it, measured in centimeters.

2.2. Equipment

2.2.1. For testing use:

device for determining mobility (drawing);

steel rod diameter 12 mm, length 300 mm;

trowel.

2.2.2. The reference cone of the device is made of sheet steel or plastic with a steel tip. The apex angle should be 30° ± 30".

The mass of the reference cone with a rod should be (300 ± 2) g.

Device for determining the mobility of a mortar mixture

1- tripod; 2 - scale; 3 - reference cone; 4 - rod; 5 - holders;

8 - locking screw

laboratory scales according to GOST 24104-88;

steel rod with a diameter of 12 mm, length 300 mm;

steel ruler 400 mm according to GOST 427-75.

3.3.

3.3.1. Before testing, the vessel is pre-weighed with an error of up to 2 d. Then fill with excess mortar mixture.

3.3.2. The mortar mixture is compacted by bayoneting with a steel rod 25 once and 5-6 repeated light tapping on the table.

3.4. Processing the results

3.4.1. Density of the mortar mixturer, g/cm 3, calculated by the formula

(1)

Where m - mass of the measuring vessel with the mortar mixture, g;

m 1 - mass of the measuring vessel without mixture, g.

3.4.2. The density of a mortar mixture is determined as the arithmetic mean of the results of two determinations of the density of a “mixture from the same sample, differing from each other by no more than 5% from a lower value.

If there is a greater discrepancy between the results, the determination is repeated on a new sample of the solution mixture.

3.4.3. The test results must be recorded in a journal in the form according to the appendix.

4. DETERMINATION OF THE STREAMABILITY OF THE MORTAR MIXTURE

4.1. The stratification of the mortar mixture, which characterizes its cohesion under dynamic influence, is determined by comparing the mass content of the filler in the lower and upper parts of the freshly molded sample with the dimensions 150x150x150 mm.

4.2. Equipment

4.2.1. For testing, use: steel molds with dimensions 150x150x150 mm according to GOST 2 2685-89;

laboratory vibration platform type 435 A;

laboratory scales according to GOST 24104-88;

sieve with cells 0,14 mm;

baking tray;

steel rod diameter 12 mm, length 300 mm.

4.2.2. When loaded, the laboratory vibrating platform must provide vertical vibrations with a frequency 2900 ± 100 per minute and amplitude ( 0.5 ± 0.05) mm. The vibrating platform must have a device that, when vibrating, provides rigid fastening of the form with the solution to the table surface.

4.3. Testing

4.3.1. The mortar mixture is placed and compacted in a mold for control samples with dimensions 150x150x150 mm. After this, the compacted mortar mixture in the mold is subjected to vibration on a laboratory vibration platform for 1 minute.

4.3.2. After vibration, the top layer of the solution with a height of ( 7.5 ± 0.5) mm from the mold is taken onto a baking sheet, and the lower part of the sample is unloaded from the mold by tipping it onto a second baking sheet.

4.3.3. Selected samples of the mortar mixture are weighed with an error of up to 2 g and subjected to wet sieving on a sieve with holes 0,14 mm.

In wet sieving, individual parts of the sample placed on a sieve are washed with a stream of clean water until the binder is completely removed. Washing the mixture is considered complete when clean water flows out of the sieve.

4.3.4. Washed portions of the filler are transferred to a clean baking sheet and dried to a constant mass at temperature 105-110°C and weighed with an error of up to 2 G.

4.4. Processing the results

4.4.1. Aggregate content in the upper (lower) parts of the compacted mortar mixture V the percentage is determined by the formula

(2)

Where t 1 - mass of washed, dried aggregate from the upper (lower) part of the sample, g;

m 2 - mass of the mortar mixture sampled from the upper (lower) part of the sample, g.

4.4.2. Indicator of stratification of mortar mixture P the percentage is determined by the formula

Where D V- absolute value of the difference between the filler content in the upper and lower parts of the sample, %;

å V- total content of filler in the upper and lower parts of the sample, %.

4.4.4. The test results must be recorded in a journal indicating:

test date and time;

sampling location;

brand and type of solution;

results of particular determinations;

arithmetic mean result.

5. DETERMINATION OF THE WATER RETENTION CAPACITY OF THE MORTAR MIXTURE

5.1. Water-holding capacity is determined by testing a 12 mm thick layer of mortar mixture laid on blotting paper.

5.2. Equipment and materials

5.2.1. For testing use:

sheets of blotting paper size 150 ´ 150 mm according to TU 13-7308001-758-88;

gauze pads size 250 ´ 350 mm according to GOST 11109-90;

metal ring with inner diameter 100 mm, height 12 mm and wall thickness 5 mm;

glass plate size 150x150 mm, 5 mm thick;

laboratory scales according to GOST 24104-88;

a device for determining the water-holding capacity of a mortar mixture (device).

5.3. Preparation for testing and testing

5.3.1. Before the test 10 sheets of blotting paper are weighed with an error of up to 0,1 g, placed on a glass plate, a gauze pad is placed on top, a metal ring is installed and weighed again.

5.3.2. The thoroughly mixed mortar mixture is placed flush with the edges of the metal ring, leveled, weighed and left to rest. 10 min.

5.3.3. The metal ring with the solution is carefully removed along with the gauze.

The blotting paper is weighed with an error of up to 0,1 G.

Diagram of a device for determining the water-holding capacity of a mortar mixture

1 - metal ring with solution; 2 - 10 layers of blotting paper;

3 - glass plate; 4 - layer of gauze cloth

hydraulic press according to GOST 28840-90;

steel rod diameter 12 mm, length 300 mm;

6.4. Preparing for the test

6.4.1. Samples from a mortar mixture with mobility up to 5 cm should be made in molds with a tray.

The form is filled with the solution in two layers. The layers of solution in each compartment of the mold are compacted 12 by pressing the spatula: 6 pressing along one side in 6 - in a perpendicular direction.

Excess solution is cut off flush with the edges of the mold with a steel ruler moistened with water and the surface is smoothed.

6.4.2. Samples from a mortar mixture mobility 5 cm and more are made in molds without a pallet.

The form is placed on a brick covered with newsprint moistened with water or other unglued paper. The size of the paper should be such that it covers the side edges of the brick. Before use, bricks must be ground manually one against another to eliminate sharp irregularities. The bricks used are ordinary clay bricks with a moisture content of no more than 2 % and water absorption 10-15 % by weight. Bricks with traces of cement on the edges cannot be reused.

6.4.3. The molds are filled with the mortar mixture at one time with some excess and compacted by pinning it with a steel rod. 25 times along a concentric circle from the center to the edges.

6.4.4. Under winter masonry conditions, to test mortars with antifreeze additives and without antifreeze additives, for each test period and each controlled area, 6 samples are made, three of which are tested within the time frame required for floor-by-floor control of the mortar strength after 3 hours of thawing at a temperature not lower than ( 20 ± 2) °C, and the remaining three samples are tested after thawing and subsequent 28 - daily hardening at a temperature not lower than ( 20 ± 2) °C. The defrosting time must correspond to that indicated in the table. .

6.4.5. Forms filled with a mortar mixture using hydraulic binders are kept in a normal storage chamber at a temperature ( 20 ± 2) °C and relative air humidity 95-100%, and forms filled with a mortar mixture on air binders - indoors at temperature ( 20 ± 2) °C and relative humidity ( 65 ± 10) %.

6.4.6. Samples are released from molds via ( 24 ± 2) hours after laying the mortar mixture.

Samples made from mortar mixtures prepared with slag Portland cement, pozzolanic Portland cement with additives as retarders, as well as samples of winter masonry stored in the open air, are released from the molds through 2-3 days

6.4.7. After release from molds, samples should be stored at a temperature ( 20 ± 2) °C. In this case, the following conditions must be met: samples from solutions prepared with hydraulic binders during the first 3 days. should be stored in a normal storage chamber at relative humidity 95-100 %, and the time remaining until the test - indoors at relative air humidity ( 65 ± 10)% (from solutions that harden in air) or in water (from solutions that harden in a humid environment); samples from solutions prepared with air binders should be stored indoors at relative air humidity ( 65 ± 10)%.

6.4.8. In the absence of a normal storage chamber, it is allowed to store samples prepared with hydraulic binders in wet sand or sawdust.

6.4.9. When stored indoors, samples must be protected from drafts, heating by heating devices, etc.

6.4.10 Before the compression test (for subsequent determination of density), the samples are weighed with an error of up to 0,1 % and measured with a caliper with an error of up to 0,1 mm.

6.4.11. Samples stored in water must be removed from it no earlier than 10 minutes before testing and wiped with a damp cloth.

Samples stored indoors should be cleaned with a hair brush.

drying cabinet according to OST 16.0.801.397-87;

steel rulers according to GOST 427-75;

desiccator according to GOST 25336-82;

anhydrous calcium chloride according to GOST 450-77 or sulfuric acid with a density 1,84 g/cm 3 according to GOST 2184-77;

7.4. Preparing for the test

7.4.1. The density of the solution is determined by testing samples in a state of natural moisture or normalized moisture state: dry, air-dry, normal, water-saturated.

7.4.2. When determining the density of a solution in a state of natural humidity, samples are tested immediately after taking them or stored in a vapor-tight package or sealed container, the volume of which exceeds the volume of the samples placed in it by no more than 2 times.

7.4.4. When determining the density of a solution in a dry state, the samples are dried to constant weight in accordance with the requirements of paragraph.

7.4.5. When determining the density of a solution in an air-dry state, the samples must withstand at least 28 days in a room at a temperature ( 25 ± 10) °C and relative air humidity ( 50 ± 20) % .

7.4.6. When determining the density of the solution under normal humidity conditions, the samples are stored 28 days in a normal curing chamber, desiccator or other sealed container at a relative air humidity of at least 95% and temperature ( 20±2) °C.

7.4.7. When determining the density of a solution in a water-saturated state, the samples are saturated with water in accordance with the requirements of paragraph.

7.5. Carrying out the test

7.5.1. The volume of samples is calculated from their geometric dimensions. The dimensions of the samples are determined with a caliper with an error of no more than 0,1 mm.

7.5.2. The mass of samples is determined by weighing with an error of no more than 0.1%.

7.6. Processing the results

drying cabinet according to OST 16.0.801.397-87;

desiccator according to GOST 25336-82;

baking sheets;

calcium chloride according to GOST 450-77.

8.5. Testing

Gypsum solutions are dried at a temperature of 45-55 °C.

A mass is considered constant if the results of two consecutive weighings differ by no more than 0.1%. In this case, the time between weighings should be at least 4 hours.

8.5.2. Before reweighing, the samples are cooled in a desiccator with anhydrous calcium chloride or in an oven to room temperature.

8.5.3. Weighing is carried out with an error of up to 0,1 G.

8.6. Processing the results

8.6.1. Humidity of the solution by weightW m as a percentage is calculated with an error of up to 0.1% using the formula

(8)

Where T V - mass of the solution sample before drying, g;

t s - mass of the solution sample after drying, g.

8.6.2. Solution humidity by volumeW o as a percentage is calculated with an error of up to 0.1% using the formula

(9)

Where r O- density of the dry solution, determined by item;

r V- density of water, taken equal to 1 g/cm3.

8.6.3. The moisture content of a solution of a series of samples is determined as the arithmetic mean of the results of determining the moisture content of individual samples of the solution.

8.6.4. The test results must be recorded in a journal indicating:

place and time of sampling;

moisture state of the solution;

age of the solution and test date;

sample marking;

humidity of the solution of samples (samples) and series by weight;

humidity of the sample solution (samples) and series by volume.

9. DETERMINATION OF WATER ABSORPTION OF SOLUTION

9.1. The water absorption of the solution is determined by testing samples. The dimensions and number of samples are taken according to clause 7.1.

9.2. Equipment and materials

9.2.1. For testing use:

laboratory scales according to GOST 24104-88;

drying cabinet according to OST 16.0.801.397-87;

container for saturating samples with water;

wire brush or abrasive stone.

9.3. Preparing for the test

9.3.1. The surface of the samples is cleaned of dust, dirt and traces of grease using a wire brush or an abrasive stone.

9.3.2. Samples are tested in a state of natural moisture or dried to constant weight.

10.6. Preparing for the test

10.6.2. The main samples must be tested for frost resistance at 28 days of age after being kept in a normal hardening chamber.

10.6.3. Control samples intended for compression testing must be stored in a normal hardening chamber at a temperature of (20 ± 2) °C and a relative humidity of at least 90%.

10.6.4. The main samples of the solution intended for testing for frost resistance and control samples intended for determining compressive strength at 28 days of age must be saturated with water before testing without prior drying by keeping them for 48 hours in water at a temperature of 15-20 ° WITH. In this case, the sample must be surrounded on all sides by a layer of water at least 20 mm thick. The saturation time in water is included in the total age of the solution.

10.7. Carrying out the test

10.7.2. Samples should be frozen in a freezing unit that allows the chamber with the samples to be cooled and maintained at a temperature of minus 15-20 °C. The temperature should be measured at half the height of the chamber.

10.7.4. The duration of one freezing must be at least 4 hours.

10.7.5. After unloading from the freezer, samples should be thawed in a bath of water at a temperature of 15-20 °C for 3 hours.

10.7.7. After alternate freezing and thawing of the samples, the main samples should be tested for compression.

10.7.8. Compression samples should be tested in accordance with the requirements of Section. of this standard.

10.7.9. Before the compression test, the main samples are inspected and the area of damage to the faces is determined.

10.7.11. When assessing frost resistance by weight loss after the required number of freezing and thawing cycles, samples are weighed in a water-saturated state with an error of no more than 0.1%.

10.7.12. When assessing frost resistance based on the degree of damage, samples are inspected every 5 cycles of alternating freezing and thawing. Samples are examined after thawing every 5 cycles.

10.8. Processing the results

Loss of strength of samplesDas a percentage calculated by the formula

(12)

Where Rcounter- arithmetic mean value of the compressive strength of control samples, MPa (kgf/cm 2);

Rbasic - arithmetic mean value of the compressive strength of the main samples after testing them for frost resistance, MPa (kgf/cm2).

The permissible value of loss of strength of samples during compression after their alternate freezing and thawing is no more than 25 %.

10.8.2. Loss of weight of samples tested for frost resistance, M as a percentage calculated by the formula

(13)

where m 1 - mass of a sample saturated with water before testing it for frost resistance, g;

m 2 - mass of a sample saturated with water after testing it for frost resistance, g.

The weight loss of samples after testing for frost resistance is calculated as the arithmetic mean of the test results of three samples.

The permissible value of weight loss of samples after alternate freezing and thawing is no more than 5 %.

10.8.3. The logbook for testing samples for frost resistance must indicate the following data:

type and composition of the solution, design grade for frost resistance;

marking, date of manufacture and date of testing;

dimensions and weight of each sample before and after testing and weight loss as a percentage;

hardening conditions;

description of defects found in samples before testing;

description of external signs of destruction and damage after testing;

the compressive strength limits of each of the main and control samples and the percentage change in strength after the frost resistance test;

number of freezing and thawing cycles.

APPLICATION 1

Mandatory

DETERMINING THE STRENGTH OF THE SOLUTION TAKEN FROM THE JOINTS,

FOR COMPRESSION

1. The strength of the solution is determined by compression testing of cubes with ribs 2-4 cm, made from two plates taken from horizontal joints of masonry or joints of large-panel structures.

2. The plates are made in the form of a square, the side of which is 1,5 times the thickness of the plate equal to the thickness of the seam.

3. Gluing the mortar plates to obtain cubes with 2-4 cm edges and leveling their surfaces is done using a thin layer of gypsum dough ( 1-2 mm).

4. It is allowed to cut cube samples from plates in the case when the thickness of the plate provides the required rib size.

5. Samples should be tested one day after their manufacture.

6. Sample cubes from solution with edges of length 3-4 cm are tested according to paragraphs of this standard.

7. For testing cube samples made of mortar with ribs 2 cm, as well as thawed solutions, a small-sized desktop press of the PS type is used. The normal load range is 1,0-5,0 kN ( 100-500 kgf).

8. The strength of the solution is calculated according to clause of this standard. The strength of the solution should be determined as the arithmetic mean of the test results of five samples.

9. To determine the strength of the solution in cubes with ribs 7,07 cm, the test results of cubes of summer and winter mortars that hardened after thawing should be multiplied by the coefficient given in the table.

APPENDIX2

tests to determine mobility, average density

mortar mixture and compressive strength, medium density

solution samples

No.

date

Brand

solution according to the passport

Receive

phone number and address

Volume

solution, m 3

Movable

mixture thickness, cm

Density

mixtures, g/cm 3

Attitude

density

Size

sample, cm

Age,

days

Working

area, cm 2

Weight

sample, g

Density

sample, solution, g/cm 3

Indications

pressure gauge, N (kgf)

Destroying-

Strength

individual sample, MPa (kgf/cm 2)

Average

strength in series, MPa (kgf/cm 2)

Tempera-

sample storage tour,° WITH

Anti-

frosty additive

Note

aspirations

sampling

tests

Head of Laboratory _____________ ______________________________

Responsible for production

and sample testing ________________________________________________

_____________

* The “Notes” column should indicate sample defects: cavities, foreign inclusions and their locations, special nature of destruction, etc.

By Decree of the USSR State Committee for Construction Affairs dated December 11, 1985 No. 214, the introduction date was established

01.07.86

This standard applies to mortar mixtures and mortars made with mineral binders (cement, lime, gypsum, soluble glass) used in all types of construction, except hydraulic engineering.

The standard establishes methods for determining the following properties of a mortar mixture and solution:

mobility, average density, delamination, water-holding capacity, water separation of the mortar mixture;

The standard does not apply to heat-resistant, chemical-resistant and stress-resistant solutions.

1. GENERAL REQUIREMENTS

1.2. Samples for testing the mortar mixture and making samples are taken before the mortar mixture begins to set.

1.3. Samples should be taken from the mixer at the end of the mixing process, at the point of application of the solution from vehicles or a work box.

Samples are taken from at least three places at different depths.

The sample volume must be at least 3 l.

1.4. The selected sample must be additionally mixed for 30 s before testing.

1.5. Testing of the mortar mixture must begin no later than 10 minutes after sampling.

1.6. Testing of hardened solutions is carried out on samples. The shape and dimensions of the samples, depending on the type of test, must correspond to those indicated in the table. 1.

1.7. Deviation of the dimensions of the molded samples along the length of the ribs of the cubes and the cross-sectional sides of the prisms indicated in Table. 1, should not exceed 0.7 mm.