Construction technology of cement-based osmosis crystalline waterproof coating

China Coatings Online News Information: Cement-based permeable crystalline waterproof coating is a powdered mixture made of silicate cement, silicon sand and active chemicals, and is currently the world's most advanced rigid waterproof material. It has the characteristics of osmosis crystallization, corrosion resistance, increase concrete tightness and improve concrete strength, it can grow inside concrete into a cranberry needle-shaped crystal, this crystal becomes an integral part of concrete, can prevent infiltration from any direction, to achieve the purpose of permanent waterproofing, in the international community with "bio-cement" said.
Mentougou district sewage treatment plant in the original waterproofing practice of waterproof mortar, external water-coated milk-type corrosion-resistant waterproof paint, according to the structure characteristics of the pool, cement mortar easy to crack, and because of the cement mortar and pool concrete label difference is large, shrink deformation is not the same, resulting in damage to the waterproof layer, adverse effects on the structure, after design investigation and research, decided to use the water in the pool water-based cement base penetration waterproof coating practice.
, construction tools: , sprinklers, wire brushes, hard brushes, agitators, pistol drills, air pumps, spray guns and so on.
, construction process: concrete substation treatment→ full wet substation→ painting cement base osmosis crystalline waterproof coating→ maintenance.
1. Concrete substation treatment: (1) check the concrete structure, find out the structure needs to be strengthened, such as: vibration is not in place to produce honeycomb hemp surface, due to secondary pouring of the construction seam site, pipe root part and through the wall bolt eye and a series of areas need to be strengthened, and use chalk to make marks. (2) Clean up areas that need to be strengthened: the honeycomb hemp face bit needs to be cleaned to a solid exposed fresh stone and rinsed with water. The weak part of the construction seam is opened 2cm×2cm square groove, the root of the pipe is opened 2cm×2cm groove, and the wall bolt needs to cut a protective layer thickness first, and then cut off the bolt rod. (3) Block the drain with cloth or cotton wire to prevent foreign materials from blocking the pipe port. (4) Remove stains, dust, release agents, pine floats and other attachment substances attached to the bottom plate of the pool and the wall of the pool. (5) Brush the bottom of the pool and the wall of the pool again with a wire brush, if the particularly smooth part, the need for gross treatment. (6) For newly discovered areas that need to be strengthened. (7) Use a labeled concrete higher than the original structure concrete to level the honeycomb hemp surface that has been treated, to ensure that the new and old concrete is firmly combined or reinforced with reinforcing materials. Reasonable construction seam weak parts, pipe roots, wall bolt holes and other use of strength materials to strengthen. (8) Clean the substing to make it clean. (9) To carry out a second inspection, there is no problem before the next step of the operation.
2. Wet substrate: wet the substrate repeatedly with water, but to master the time spacing, do not make the bottom of the pool too much water. Painted cement base osmosis crystalline waterproof coating. (1) Cement-based osmosis crystalline waterproof coating powder and water in accordance with the ratio of 5:3 (volume ratio) into the container mixed mixing, stirring must be uniform before use. (2) After mixing and mixing materials should be used up within 30 minutes from mixing, the use of the process is prohibited to add water. (3) Construction should be using a hard brush coating brush, brushing the material evenly applied to the wet concrete substed surface.
3. Conservation: According to the environmental conditions of the pool, in general, only three times a day in the cement-based penetration crystalline waterproof coating surface spray water, maintenance 3 to 5 days. If the water evaporates too quickly, it needs to be protected by spraying water several times a day or by covering the surface with a grass curtain or sack. Proper ventilation is required in unventilated environments such as basements and civil defense works. The maintenance operation begins after 12 hours of brushing.
, quality acceptance basis. In accordance with the Beijing municipal project acceptance of the relevant management regulations and underground waterproof construction norms for acceptance. Brush layer thick and uniform (no leakage, no blank), no powder, no skin, the average amount of 1kg / square meters. (The coating thickness is not less than 0.8mm).
, note: (1) cement-based osmosis crystalline waterproof coating must be at a temperature of not less than 5 degrees Celsius under the circumstances of construction and maintenance. (2) In warm weather, such as the occurrence of direct sun exposure, conservation measures should be taken to prevent just painted cement base penetration crystalline waterproof paint dry too fast. (3) If the concrete surface is dry before painting, be sure to moisten the surface in advance. (4) Cannot be constructed when it rains. (5) Cement-based osmotic crystalline waterproof coating needs direct contact with air to ensure successful maintenance, remember that the use of plastic film maintenance can not be directly laid on the coating. (6) For the pool, waterproof paint after construction maintenance to maintain at least three to five days, 14 days before water injection. (7) After painting waterproof paint 48 hours should avoid high winds, direct sunlight, rain and low temperature damage below five degrees above zero, 12 hours is prohibited.
After observation on the use of cement-based osmosis crystalline waterproof coating for the sewage treatment plant project in Mentougou District, the construction seams at the old and new concrete joints, bolted eyes through the wall, etc. all end the leakage phenomenon, and it is worth mentioning that the thickness of the first floor plate under the adjustment pool is only 2 00mm (according to the newly promulgated underground waterproof construction specifications, waterproof concrete cross-section thickness is not less than 250mm), and the underground layer is a water layer, the use of cement-based osmosis crystalline waterproof coating, the original leakage points are gradually healing, until no longer leakage. The use of inoromic waterproof coating non-toxic, anti-permeable concrete pool structure, antifreeze, prevention of alkali collecting reaction and chemical infringement and other aspects have a strong advantage, a large investment, but can produce permanent protection of concrete structure, so the author believes that inorance waterproof coating in concrete structure waterproof application will be more and more extensive.
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