Waterproof coating quality testing standards
Waterproof coating synthesis can be divided into the following three types:
1, organic waterproof coating mainly consists of synthetic rubber, synthetic resin and rubber asphalt. Organic waterproofing paint curing film is formed of flexible waterproof layer, commonly used in the engineering of water face, this is to give full play to the organic waterproof coating has good impermeability in certain thickness, the surface ( especially in a variety of complex surface ) can form a waterproof membrane seamless integrated strengths, and to avoid small coatings and surface adhesion. Winter construction, emulsion coating is not suitable, should apply the reactive coating, solvent type coating is suitable for winter construction, but because of the volatile solvent will pollute the environment, so it is not suitable to be used in closed underground engineering.
Chloroprene rubber waterproof coating, SBS modified asphalt waterproof coating and polymer emulsion waterproof coating of volatile curing, polyurethane waterproof coating is a reaction curing type.
2, the polymer cement waterproof paint JS waterproof coating, the current development of domestic polymer cement waterproof paint soon, dosage increasing, Japan said that such materials as moisture-set coating, polymer cement paint is acrylic polymer emulsion and cement as the main raw material, adding other additives prepared two-component waterborne architectural waterproof coating the raw materials used, no harm to the environment and human health. Compared with the general organic paint dry fast, low elastic modulus, shrinkage, permeability good, foreign called the elastic waterproof coating.
Waterproof coating is divided into two types: type I: waterproof coating with polymer based
Type II: waterproof coating to cement as
Application: the product is mainly used for non - type building waterproof engineering long-term immersion environment
Building waterproof engineering type product is suitable for long-term immersion environment
3, inorganic waterproof coating is mainly cement inorganic paint, including the polymer modified cement based waterproof paint and cement based permeable crystallization type waterproof coating. This is a kind of cement and quartz sand as a substrate, the incorporation of a new type of rigid waterproofing materials of various active chemical materials, it can be used as a waterproof agent directly into the concrete, but also can be used as waterproof coating painted on the concrete surface, the material with the help of the carrier is not broken penetration into concrete, and the formation of water insoluble crystalline filling the pores and a set of concrete, greatly improve the compactness and waterproof concrete.
Six quality inspection standard waterproof coating:
A, -25 degrees low temperature flexibility test:
To wax on the plate glass, the prepared waterproof paint brushing a horizontal straight the road, interval of two hours, the film thickness of 1.0-1.5 mm, eight hours after the nail feels dry from the glass plate removed, in ( 25± 2 ℃) is placed in the indoor temperature for 7 days, and then cut the long twenty cm, two cm wide strips, at -25℃, put the sample in half an hour, a pencil and the wound, no cracks and fracture for low temperature flexibility detection qualified.
Check two, fracture extension rate:
In waterproofing, waterproofing materials will stir well, coating on the glass plate has multiple wax on the smooth, coating thickness of 1.0-1.5 mm, after 7 days, 7 days immersion in about 1% alkaline water, and then to the thermostat at 50 ℃ in soil is 2℃for twenty-four hours, do dumbbell tensile test, request extension keep rate reached 80% ( no treatment was 200%, such as up to standard, for the elongation to inspection, such as unqualified can increase the amount of emulsion.
Three, bond stress check:
High polymer waterproof mortar, can be directly formed " 8 " font, 24 hours after the die. Put in the water for 7 days, the indoor temperature of 25± 2 ℃dry curing for 28 days, for bonding experiment. Polymer waterproof mortar, gray water: =1:0.11:0.14 gum, polymer waterproof mortar for 2.3MPa. The polymer waterproof coating mixing paste, will be a good coating to 2.5 " 8" mortar block, place 7 days for bonding experiments, polymer waterproof coating proportion ( high ), powder: gum =1:1.4; ( shot ), powder: adhesive =1:0.8-1. Low molecular waterproof coating is greater than or equal to 0.5MPa, bond index for qualified.
Four, water impermeability test:
Special detection equipment used in laboratory, the method is to paint in proportion, multiple populations in wax glass plate, coating thickness of 1.5 mm, and let rest for 7 days, then put in the oven at 50± 2 ℃drying for 24 hours, took place after 3 hours, do not water experiment, don't permeability of 0.3MPa. Hold for 30 minutes without leakage and wet printing for qualified, also uses a visual inspection and waterproof effect, method is to paint in 4 - 6 times coating to the non-woven cloth, dry ( about 24h) film thickness of 1.0-1.5 mm, a shoe box shape, and then the 1% alkaline into the box, after three days without any leakage for qualified.
Five, water resistance inspection: paint brush in many cement block, film thickness of 1.0-1.5 mm, placed for 7 days, in 7 days 1% alkali soak in the water, no delamination peeling, no hollowness is qualified.
Six, the film thickness should check: thorn three points every 100 square meters by needle puncture method, using a ruler to measure the height, the average values, the film thickness should be more than 1.5 mm. Mark, so do the puncture repair.