Six Common Testing Methods for Waterproof Coating Indicators
Release time:
2019-09-20
Source:
1. Film Thickness Inspection:
The needle puncture method should be used to puncture three points for every 100 square meters, measuring the height with a ruler to obtain the average value. The film thickness should be greater than 2 millimeters. During puncturing, use a colored pen to mark for repair.
2. Elongation at Break Inspection:
During waterproof construction, the supervisor can go to the construction site to apply the mixed material multiple times on a flat glass plate (the glass plate should be waxed first), achieving a film thickness of 1.2-1.5 millimeters. After placing it for 7 days, soak it in 1% alkaline water for 7 days, then dry it in an oven at 50℃ ± 2℃ for 24 hours, and conduct a dumbbell-type tensile test, requiring an elongation retention rate of 80% (untreated is 200%). If the standard is not met, it indicates insufficient emulsion mixing ratio during construction.
3. Water Resistance Inspection:
Apply the coating multiple times on a cement block, achieving a film thickness of 1.2-1.5 millimeters. After placing it for 7 days, soak it in 1% alkaline water for 7 days. No delamination or hollowing is required for it to be qualified.
4. Impermeability Inspection:
Under suitable conditions, use instruments for testing. The method is to proportionally mix the coating and apply it multiple times on a glass plate (the glass plate should be waxed first), achieving a thickness of 1.5 millimeters. Let it stand for 7 days, then place it in an oven at 50℃ ± 2℃ for 24 hours. After taking it out, let it sit for 3 hours and conduct an impermeability test, requiring impermeability of 0.3MPa. No leakage for 30 minutes is qualified.
If conditions are not met, visual inspection can be used to check the waterproof effect. The method is to apply the coating 4-6 times on non-woven fabric, and after it dries (about 24 hours), achieving a film thickness of 1.2-1.5 millimeters, form it into a shallow box shape suspended in the air, ensuring no dead corners. Then add 1% alkaline water into the box, and no leakage for 24 hours is qualified.
5. Bonding Strength Inspection:
G-type polymer waterproof mortar can be directly formed into an "8" shape mold, and demolded after 24 hours. Soak in water for 6 days, and cure indoors at a temperature of 25℃ ± 2℃ for 21 days, then conduct a bonding test. G-type waterproof mortar ratio: cement: water: adhesive = 1:0.11:0.14, G-type waterproof mortar strength is 2.3MPa.
Mix R-type coating to a sesame paste consistency, apply the mixed coating to two half "8" mortar blocks, and after 7 days conduct a bonding test. R-type ratio (high elasticity), powder: adhesive = 1:1.4; (medium elasticity), powder: adhesive = 1:0.8-1. R-type strength is 0.5MPa, and meeting or exceeding the bonding index is qualified.
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