Construction scheme of cement-based osmotic crystallization waterproof coating
1? Climate and concrete foundation conditions
(1) cannot be used in the rain or when the ambient temperature is lower than 4℃
(2) Because the cement-based osmotic crystallization waterproof material needs to be wetted in the process of concrete crystallization, both new and old concrete should be soaked in water to strengthen the siphon effect on the surface, but there can be no clear water.
(3) Fresh concrete is the best time to use cement-based permeable crystalline waterproof material, but its surface can only be used after 20 hours of pouring.
(4) The concrete base surface should be rough and clean, so as to provide a completely open capillary system for infiltration. For the used steel formwork or surface with alkali resistance, dust, various coatings, films, paints, oil stains or other foreign bodies, it must be treated, and methods such as chiseling, sandblasting, pickling (hydrochloric acid), wire brushing and high-pressure water washing should be adopted. (If hydrochloric acid corrosion method is used, it must be wetted with water first, and the surface is thoroughly cleaned with water after acid treatment. ) If there are defects, cracks and honeycomb pits on the surface of the structure, they should be chiseled and cleaned up, or consult the technical department of our company.
2? Construction scheme and construction method of cement-based permeable crystallization waterproof coating
(1) Plastering method:
Use a trowel to evenly spread the prepared waterproof coating on the waterproof construction surface, and require the waterproof coating to be evenly distributed according to the standard of 1.2kg per square material, so that the construction can be completed at one time. This construction method can ensure the compactness and tightness of waterproof coating and waterproof surface, so it is generally used for waterproof construction of facade and top surface.
(2) Scraping method:
Scrape the mixed waterproof coating evenly on the waterproof construction surface with a rubber scraper, which can be used for one-time scraping construction. This waterproof construction method can ensure the uniform construction of waterproof coating and fast construction progress, and is generally used for horizontal waterproof construction of roofs, basements and floors. In the waterproof construction of the water front surface, it is impossible to predict the possible seepage position, so the dosage should be slightly increased to improve the impermeability of the waterproof coating as much as possible, and attention should be paid to the treatment of the honeycomb base surface. In the construction of back water surface, small leakage is easy to be detected, so plugging should be carried out before waterproof construction.
The conventional dosage is 1.3- 1.5 kg/m2, and the coating thickness is 1.0- 1.2 mm. ..
(3)? Brush coating method:
For uneven waterproof construction surface (such as underground continuous wall) and waterproof construction in special parts, this method requires that the waterproof surface has a certain humidity before construction. It is best to brush and spray water at the same time, and it is required to brush twice. For the rough waterproof surface, this method can save the amount of waterproof coating, and coating on the rough surface can ensure the uniform distribution of waterproof coating and strong adhesion between the coating and the base surface.
Routine dose ≥ 1.0? Kg/m2, the coating thickness is 0.8-65438±0.2mm mm .. Generally, it is about 0.5-0.8kg/m2 once.
(4)? Dry scattering method:
Construction shall be carried out after concrete is poured, compacted, rolled or vibrated, compacted and leveled (before concrete is completely solidified). In accordance with the provisions, the dosage will be evenly spread on the concrete surface, and compacted and polished in time. After the final set, check whether there is any bad construction place and repair it in time; If it is exposed to the sun, it should be watered and maintained.
Conventional dosage: about 1.5kg/m2, coating thickness1.0-1.2 mm. ..
3? Matters needing attention in construction
(1) When mixing materials, it is necessary to master the ratio of material to water, and it is not advisable to adjust more at one time. When the mixture thickens, it should be stirred frequently without adding water in the middle.
(2) The construction scheme of cement-based permeable crystalline waterproof coating is as alkaline as concrete, so direct contact with skin should be avoided. Wear rubber gloves if dry powder or wet material needs to be stirred by hand. The coating should be uniform and applied everywhere, and it is difficult to maintain if the coating is too thick. Pay attention to the force when brushing, and brush back and forth vertically and horizontally to ensure that the convex and concave parts can be brushed evenly.
(3) When the second coating is needed, it must be done when it is still wet after the first initial setting (i.e. within 48 hours). If it is too dry, spray some water first. During open-air construction in hot weather, it is recommended to avoid sun exposure, and it should be carried out in the morning and evening or at night to prevent the coating of FLW cement-based permeable crystalline waterproof material from drying too fast, resulting in peeling and cracking on the surface and affecting penetration.
(4) Pay attention to evenly brush FLW cement-based permeable crystalline waterproof material at the yin and yang corners of the horizontal plane or steps, and brush the yin corners. There should not be too much deposition at the yin corners and depressions, otherwise it may crack at the accumulation places.
(5) For cracks that are easily deformed, other flexible materials should be combined with FLW permeable crystalline materials.
(6) Wet soil can only be backfilled after 36 hours of construction of FLW cement-based permeable crystalline waterproof material, and dry soil cannot be backfilled within 7 days to prevent it from absorbing water to the coating of FLW cement-based permeable crystalline waterproof material.
Maintenance construction scheme of cement-based permeable crystalline waterproof coating
1? After the coating is semi-dry, it should be sprayed with water mist for maintenance. Clean water must be used for maintenance, and the water flow should not be too large, otherwise the coating will be damaged. Generally, it is necessary to spray water 3-4 times a day for 2-3 consecutive days, and spray more times in hot or dry weather to prevent the coating from drying prematurely.
2? Within 48 hours after construction, we must do a good job in protecting against rain, sand, frost, sun, sewage and low temperature below 4℃. In the case of poor air circulation, fans or blowers are needed to help maintain it (such as closed pools or wet wells). It is best to cover the open-air construction with wet straw bags, but to avoid water accumulation in the coating, if plastic film is used as the protective layer, it must be erected to protect the "breathing" and ventilation of the coating.
3 concrete structures containing liquid (such as swimming pools, reservoirs and water storage tanks, etc.). ) must be cured for 3 days, and then left for 12 days before pouring the liquid. For concrete structures containing particularly hot or corrosive liquids, it takes 18 days to fill them.
Conclusion: The above is the introduction of the construction scheme of osmotic crystallization waterproof coating that Bian Xiao will tell you today. I believe that after reading Bian Xiao's introduction, you have a simple understanding of relevant information in this respect. Finally, what Bian Xiang Xiao tells you is that waterproofing of buildings is more important. After all, buildings are places where people work and live. Poor waterproofing will cause us economic losses, and if it is serious, it may endanger our lives at any time.