Polymer cement waterproof coating testing standard and method

The visual inspection was first carried out, that is, the liquid components and the solid components were separately visually stirred with a glass rod. The liquid component should be a uniform emulsion without impurities and without gel; the solid component should be an impurity-free, agglomerated powder.

First, the determination of solid content

After the samples of the polymer cement coating were uniformly mixed according to the proportions specified by the manufacturer, they were measured in accordance with the provisions of Chapter 4A of GB/T 16777-1997. The specific measurement method is as follows.

1. The culture dish with diameter of 75~80mm and side height of 8~10mm was placed in a drying oven and dried for 30 minutes at (105±2) DEG C and taken out into a desiccator containing discolored silica gel or anhydrous calcium chloride. , Weigh after cooling to room temperature.

2. Stir the polymer cement waterproof coating sample and weigh approximately 2g of the sample (enough to ensure the final dry solids) in a weighed petri dish, and evenly spread the sample on the petri dish. bottom of. Then put it in a drying oven and dry it for 1 hour at (105±2)°C. Place it in a desiccator and weigh it after cooling to room temperature. Then, the culture dish was placed in a drying oven, dried for 30 minutes, and then placed in a desiccator and weighed after cooling to room temperature. Repeat the above operation until the difference between the previous and the next weighing is not more than 0.01g (all the weighing accuracy is 0.01g).

3, the calculation of test results

(1) Solid content is calculated according to formula (5-1):

X=(m2-m)/(m1-m)×100 (5-1)

In the formula X - solid content,%;

M-- Petri dish quality, g;

M1--samples and dishes before drying, g;

M2--mass of the dried sample and petri dish, g.

(2) Calculate the volatiles and non-volatiles according to formula (5-2) and formula (5-3):

V=(m3-m4)/m3×100 (5-2)

VN=m4/m3×100 (5-3)

Formula V--volatile content,%;

VN - non-volatile content,%;

M3--sample mass before drying, g;

M4--sample mass after drying, g.

4. The results of the assessment and test report are as follows.

The test result is the average of two parallel tests. The test result for each sample is calculated to the nearest 1%.

The test report shall specify the following: 1. The type, name, lot number of the sample; 2. Test temperature; 3. Solid content of the sample or volatile and non-volatile content.

Second, the drying time measurement

The drying time was measured as follows.

1. Samples of polymer cement waterproof paint after being placed under standard test conditions for a period of time shall be weighed in appropriate proportions according to the proportions specified by the manufacturer, and the mixture shall be mechanically stirred for 5 minutes, and then painted as required by the product. A film is prepared on the aluminum plate and no blank is allowed. The amount of paint used was (8±1)g, and the time at which painting was completed was recorded. The specifications of the aluminum plate are 50mm x 150mm x 1mm.

2. Drying time measurement item The measurement of the dry time and the measurement of the dry time are two items. The test conditions were temperature (23±2)°C and relative humidity: (50±5)%.

(1) Determination of surface dry time After applying a certain amount of time to the coating film prepared on the aluminum plate, touch the surface of the coating film with the finger from the edge of the film surface no less than 10 mm. If it feels a little sticky but no paint is present Stick on your finger and dry it. Record the time.

(2) Determination of the dry time The coating film prepared on the aluminum plate was cut with a single-faced insurance blade. If there is no adhesion between the bottom layer and the film, it can be considered as dry. Make a note of the time it takes for the film to reach dry, which is the dry time.

3. The test report shall include the following: (1) The name, type and batch number of the test specimen; (b) Dry time of the test specimen; (3) Actual dry time of the test specimen.

Third, the determination of tensile properties

The measurement of tensile properties includes the measurement of tensile strength and elongation at break, which is determined as follows.

1. The main test equipment

(1) Tensile testing machine The measuring range is 0~500N, the stretching speed is 0~500mm/min, and the minimum scale value of the scale is 1mm.

(2) The slicer shall use a dumbbell type I cutter in accordance with GB/T 528.

(3) Thickness gauge (100 ± 10) g, measurement surface diameter (10 ± 0.1) mm, minimum division value 0.01 mm.

(4) The temperature control accuracy of the electric blast drying oven is ±2°C.

(5) Ultraviolet aging box 500W high-pressure mercury lamp with lamp tube parallel to the bottom of the box. The box size is 600mm x 500mm x 800mm.

(6) The artificially accelerated weathering box light source is a 4.5 to 6.5 kw tubular xenon arc lamp with a distance between the sample plate and the light source (center) of 250 to 400 mm.

(7) The material and dimensions of the coating die are shown in Figure 5-1.

2. Preparation of sample

After placing the polymer cement waterproof coating sample under standard conditions for a period of time, the appropriate amount of liquid component and solid component shall be weighed according to the ratio specified by the manufacturer, mixed and mechanically stirred for 5 minutes, and poured into a coating film mold for coating. Be careful not to get air bubbles. For mold release, the mold surface can be treated with silicone oil or paraffin wax. When the sample is prepared, it should be coated in two or three times. The subsequent coating should be performed after the previous coating is dried. The sample thickness should be within (1.5 ± 0.2) mm within 72 hours. The sample was released and placed under standard conditions for 168 hours, then placed in a drying oven at (50±2)°C for 24 hours. After being taken out, it was placed in a desiccator and left for at least 2 hours under standard conditions. The number and shape of the specimens required to cut the tensile specimens using a microtome are shown in Table 5-1.

Table 5-1 Tensile test specimen number and shape

3. Determination of tensile properties

Including the measurement of the tensile strength without treatment, the measurement of the tensile properties after the heat treatment, the measurement of the tensile properties after the alkali treatment, and the measurement of the tensile properties after the ultraviolet treatment.

(1) Determination of the tensile properties of untreated specimens Place the specimens under standard conditions for 2 hours, then use a ruler to draw two parallel markings with a spacing of 25 mm on the specimen, and measure the middle of the specimen markings with a thickness gauge. And the thickness of the three points at both ends, and the arithmetic average thereof is the average thickness of the test part of the test piece (d); the test piece is placed between the tensile tester jigs, and the gauge length between the jigs is 70 mm to 200 mm/min. Tensile speed of tensile specimen to fracture, record the maximum load (F) when the specimen breaks; and measure the distance between the specimen marking line (L1), accurate to 0.1mm; test five specimens, if If the test piece breaks at the marking line, the test result is invalid and spare parts should be used to make up.

(2) Determination of tensile properties after heat treatment According to the method of measuring the tensile properties without treatment, markings were drawn on the test pieces, and then the test pieces were placed flat on the glazed tiles, and then placed together in an electric blast drying box; The distance between the test piece and the box wall shall not be less than 50mm; the center of the test piece shall be in the same horizontal position as the mercury ball of the thermometer; it shall be taken out at a constant temperature of (80±2)°C for 68 hours, and then be measured according to the method for measuring the tensile strength without treatment. test.

(3) Determination of tensile properties after alkali treatment When the temperature is (23 ± 2) °C, the calcium hydroxide reagent is added to the chemically pure 0.1% NaOH solution as specified in GB/T 629 to make it saturated. Place the sample in 600 mL of this solution. The liquid level should be higher than 10 mm above the sample table. After soaking for 168 h, remove it, rinse thoroughly with water, dry it, and place it in a drying oven at (50±2)°C. Bake 6h; after taking out and cooling to room temperature, cut into dumbbell-shaped specimens with the same cut, and then test the performance of nowhere to extend the test.

(4) Determination of tensile properties after UV treatment The test specimens with good markings were placed flat on a glazed tile and placed in an ultraviolet aging chamber. The distance between the lamp and the test piece is 470~500mm, and the space temperature of about 50mm from the surface of the test piece is (45±2)°C, and the irradiation time is 250h. After being taken out, it was cooled to room temperature, and then tested according to the method for determining the tensile property without treatment.

4. Calculation of test results

(1) The tensile strength is calculated according to formula (5-4):

P=F/(a×d) (5-4)

P- tensile strength, MPa;

F - maximum load of specimen, N;

a--Dumbbell-shaped I-type knife narrow parallel width, mm;

D--average thickness of test part length, mm.

Tensile strength test results are expressed as the arithmetic average of five test pieces, accurate to 0.1 MPa.

(2) Elongation at break is calculated according to formula (5-5):

L=(L1-25)/25×100 (5-5)

L-- specimen elongation at break, %;

L1-- gauge length at which specimen breaks, mm;

25--The initial gauge length of the specimen, mm.

The elongation at break test results are expressed as the arithmetic average of five test specimens, with an accuracy of 1%.

(3) The tensile strength retention rate is calculated according to formula (5-6):

E=P1/P0×100 (5-6)

E--treated tensile strength retention rate, in the formula;

P1--treated tensile strength, MPa;

P0 - tensile strength under standard conditions, MPa.

The calculation of the tensile strength retention rate is accurate to 1%.

5. Test result determination and test report content.

The test result takes 3 significant figures and is represented by the arithmetic average of 5 test pieces.

The test report shall specify the following: 1. The name, type and batch number of the test specimen; 2. The speed of drawing; 3. The method of processing the specimen; 4. The tensile strength of the specimen; 5. The elongation at break of the specimen rate.

Fourth, the determination of low temperature flexibility

The low temperature flexibility is determined as follows.

1. Prepare a film sample according to the preparation method of the sample in the tensile test. After demoulding, 3 pieces of 100 mm x 25 mm pieces were cut.

2. Put the test piece and φ10mm round bar in a low-temperature freezer at -10°C. Hold the refrigerator for 2 hours, and quickly squeeze the two ends of the sample (coated side up) to bend around the bar in 3~4s. 180 degrees, and record the temperature at this time, take out the test piece immediately observed its surface without cracks, fracture phenomenon.

3. Evaluation of test results No test report fill in content The evaluation of test results should record whether the surface of the test specimen has cracks or cracks.

The test report shall specify the following: 1. The name, type and batch number of the test specimen; 2. The test temperature; 3. The diameter of the round bar; 4. The surface phenomenon of the test piece.

Fifth, the measurement of water impermeability

Water impermeability was measured as follows.

1. Prepare a film sample according to the preparation method of the sample in the determination of tensile properties. After demoulding, three 150 mm x 150 mm specimens were cut.

2. Place the test piece under standard conditions for 1 hour, and inject clean tap water under standard conditions into an impervious tester conforming to GB/T 328.3 to overflow. Open the inlet valve, and then add water pressure. The water in the storage tank flows out and clears the air.

3. Place the coated surface of the test piece on the impervious instrument disc, and add a piece of copper mesh cloth with the same size and an aperture of 0.2 mm on the sample piece, start pressing, open the inlet valve, and close it. Total water valve, apply test pressure to 0.3 MPa, and maintain this pressure for 30 min. Pressure relief, remove the test specimen, observe the phenomenon of seepage.

4. Evaluation of test results and filling out of test reports The evaluation of test results should record the presence of water seepage in each test piece.

The test report shall specify the following: 1. The name, type and batch number of the test specimen; 2. Test pressure and time; 3. The seepage condition of the test specimen.

Sixth, the determination of the moisture base surface adhesive strength

The moisture base bond strength was measured as follows.

1. The main test equipment

(1), tensile testing machine: range 0 ~ 1000N, tensile strength 0 ~ 500mm/min;

(2), '8' shaped metal mold, see Figure 5-2;

(3), '8' shaped cement mortar block, see Figure 5-3;

(4), cement standard curing box (room): temperature control range (20 ± 1) °C, relative humidity of not less than 90%;

(5) Vernier caliper with an accuracy of 0.1mm.

2. Preparation of test pieces

Use a standard portland cement No. 425 in accordance with GB/T175 and medium sand and water in a mass ratio of 1:2:0.4 to form a mortar. After inserting a piece of 0.5mm thick metal sheet in the metal mold shown in Fig. 5-2. , Filled with a good mortar trowel compaction, 24h after release, the '8' word block in the water conservation 7d, air dry spare. The laitance on the cross-section of the mortar block was removed and the block was soaked in (23±2)°C water for 24 hours. The sample after being placed under standard conditions is weighed according to the ratio specified by the manufacturer in a suitable amount of the liquid component and the solid component, and after mixing, mechanically stirred for 5 minutes. Remove the mortar block from the water and let it stand for 5 minutes. Spread the mixed polymer cement waterproof coating sample on the cross section of the mortar block. Carefully butt joints of the two mortar blocks and place them under standard conditions for 4 hours. The prepared test pieces were placed in a cement standard curing box for 168 hours. The curing conditions were as follows: temperature (20±1)°C, relative humidity not less than 90%, and 5 test pieces were prepared for each group of samples.

3. Test procedure

The cured specimen was placed under standard conditions for 2 hours. The length (a) and width (b) of the bonded surface of the specimen were measured with a caliper. The length and width were measured in mm. The test piece was placed on a tensile tester jig and the test piece was pulled at a speed of 50 mm/min to record the tensile force (F) at failure of the test piece.

4. Calculation of test results

The bond strength is calculated according to formula (5-7):

σ=F/a×b (5-7)

The bond strength of σ-- specimen in the formula, MPa;

F - tensile force at failure of the specimen, N;

A--the length of the adhesive surface of the test piece, mm;

B--the width of the adhesive surface of the test specimen, mm.

The bond strength test results are expressed as the arithmetic average of five test pieces, accurate to 0.1 MPa.

VII. Determination of impermeability

The specific method of measuring the impermeability is as follows.

1. The main experimental apparatus

(1) Mortar penetration tester: SS15 type;

(2) Cement standard curing box (room): control range (20 ± 1) °C, relative humidity not less than 90%;

(3), metal test mold: truncated cone with a round mold, the upper diameter of 70mm, the lower diameter of 80mm, height 30mm;

(4), rods: diameter 10mm, length 350mm, rounded end;

2. Preparation of test pieces

(1) Preparation of mortar specimens According to the provisions in Chapter 4 of GB/T2419-1994, the mortar ratio and amount are determined, and the water-cement ratio is determined by the permeability of the mortar specimens under a pressure of 0.3 to 0.4 MPa. Three specimens were prepared from each set of specimens and put into (20±2)°C water for 7 days after demoulding. After the surface to be dried is taken out, the impermeability test of the mortar specimen is carried out by sealing it with a sealing material. The water pressure starts from 0.2 MPa, increases to 0.3 MPa after 2 h of constant pressure, and then increases by 0.1 MPa every 1 h until all three specimens are permeable.

(2) Preparation of Impermeability Test Pieces of Paint Film Permeated mortar specimens were removed from the penetrometer, and the upper surface of the test specimens were wiped to remove water stains. Appropriate proportions of the paint products to be measured were weighed according to the proportion specified by the manufacturer. The liquid and solid components were mixed and mechanically stirred for 5 min. Apply the mixed sample to the upper surface (back surface) of the three test specimens. The first 0.5-0.6mm thick sample is ready for coating. After the surface is dry, the second surface is covered with sand. The total thickness of the coating is 1.0. ~1.2mm. After the second coating film is dry, the prepared impermeability test piece is placed in a cement standard curing box (chamber) for 168 hours. The curing conditions are: temperature (20±1)°C and relative humidity not less than 90%.

3. Determination of impermeability

The impermeability test piece is taken out of the cement standard curing box (chamber) and placed under standard conditions. After the surface is dried, it is placed in an infiltrator and the coating film is imperviously tested according to the pressing procedure described in the preparation of the sanded sample. Impermeability test. When two of the three impermeability test specimens have water permeation on the upper surface, the group of tests can be stopped and the water pressure at that time can be recorded. When the impermeability test piece is pressurized to 1.5 MPa and the constant pressure is not permeable for 1 h, the test should be stopped.

4. Test result report

The test results of the impermeability of the coating shall report the maximum water pressure of two of the three specimens without water permeability.

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