Coating technology: Construction Technology of cement-based permeable crystalline waterproof coating

Core tip: the cement-based permeable crystalline waterproof coating is a kind of powder mixture made of Portland cement, silica sand and active chemicals, which is the advanced rigid waterproof material in the world It has the characteristics of infiltration crystallization, corrosion resistance, increasing the density of concrete and improving the strength of concrete It can grow into a branch like needle crystal inside the concrete This crystal becomes an integral part of the concrete It can prevent the infiltration from any direction and achieve the purpose of permanent waterproof It is internationally known as "biological cement" Mentougou sewage treatment plant pool Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Coating home news: cement-based permeable crystalline waterproof coating is a kind of powder mixture made of Portland cement, silica sand and active chemicals It is an advanced rigid waterproof material in the world It has the characteristics of infiltration crystallization, corrosion resistance, increasing the density of concrete and improving the strength of concrete It can grow into a branch like needle crystal inside the concrete This crystal becomes an integral part of the concrete It can prevent the infiltration from any direction and achieve the purpose of permanent waterproof It is internationally known as "biological cement" In Mentougou sewage treatment plant, water-proof mortar and water emulsion corrosion-resistant waterproof coating were used for the internal waterproofing of the pool According to the structural characteristics of the pool, the cement mortar is easy to crack Due to the large difference between the cement mortar and the pool concrete, the shrinkage deformation is not the same, resulting in the damage of the waterproof layer, which has a negative impact on the structure Based on the design, investigation and research, it was decided to use the The waterproof method of applying cement-based permeable crystalline waterproof coating on the water face of the pool 1、 Construction machines and tools: chisel, water sprayer, wire brush, bristle brush, mixer, pistol drill, air pump, spray gun, etc 2、 Construction process: concrete base treatment → fully wetting the base → brushing cement-based permeable crystalline waterproof coating → curing 1 Treatment of concrete foundation surface: (1) check the concrete structure and find out the parts that need to be strengthened in the structure, such as the honeycomb and pitted surface caused by inadequate vibration, the construction joints caused by the secondary pouring, the pipe roots and the bolt holes through the wall and a series of parts that need to be strengthened, and mark them with chalk (2) Clean the parts that need to be strengthened: the honeycomb and pitted parts need to be cleaned until they are solid and exposed with fresh stones and washed with water 2cm × 2cm square groove shall be opened at the weak part of the construction joint; 2cm × 2cm groove shall be opened at the pipe root; a protective layer thickness shall be chiseled first for the through wall bolt, and then the bolt rod shall be cut (3) Plug the water inlet and outlet with cloth or cotton to prevent the pipe orifice from being blocked by foreign substances (4) Remove the dirt, dust, mold release agent, loose and floating objects and other attached substances on the bottom plate and wall of the pool (5) Brush the bottom and wall of the pool once with a wire brush If there is a particularly smooth part, it needs to be roughened (6) For the newly found parts that need to be strengthened (7) use a grade of concrete higher than the original structural concrete to level the treated honeycomb and pitted surface to ensure that the new and old concrete are firmly combined or reinforced with reinforcement materials Reasonable weak parts in construction joints, pipe roots, through wall bolt holes, etc shall be reinforced with reinforcement materials (8) clean the base surface to make it clean (9) carry out the secondary inspection, and carry out the next process only after there is no problem 2 Wet the base surface: repeatedly wet the base surface with water, but master the time interval, and do not make the pool bottom accumulate too much water Apply cement-based permeable crystalline waterproof coating (1) The cement-based permeable crystalline waterproof coating powder and water shall be poured into the container in the proportion of 5:3 (volume ratio) for mixing and mixing, and can be used only after the mixing is even (2) The materials after mixing shall be used up within 30 minutes after mixing, and it is forbidden to add water during use (3) During the construction, the hard bristle brush shall be used to brush with material, and the material shall be brushed evenly on the wet concrete base surface 3 Maintenance: according to the environmental conditions of the pool, in general, it is only necessary to spray clean water on the surface of the cement-based permeable crystalline waterproof coating three times a day for 3 to 5 days If the water evaporates too fast, it needs to be protected by spraying water several times a day or covering the surface with straw curtains or sacks If it is not ventilated, such as basement, civil air defense works, proper ventilation is required The curing work shall be started 12 hours after painting 3、 Quality acceptance basis Acceptance shall be carried out in accordance with the relevant management regulations of Beijing Municipal Engineering Acceptance and the underground waterproof construction specifications The thickness of the coating layer is uniform (no missing coating, no blank), no powder, no peeling, and the average dosage is 1kg / m2 (the coating thickness shall not be less than 0, 8mm) 4、 Precautions: (1) the cement-based permeable crystalline waterproof coating must be constructed and maintained at a temperature of not less than 5 ℃ (2) In warm weather, in case of direct sunlight, curing measures shall be taken to prevent the newly applied cement-based permeable crystalline waterproof coating from drying too fast (3) If the concrete surface is dry before painting, it must be wetted in advance (4) Construction is not allowed in case of rain (5) The cement-based permeable crystalline waterproof coating needs to be in direct contact with the air to ensure the success of curing Remember that when the plastic film is used for curing, it cannot be directly laid on the coating (6) For the water pool, the water-proof coating shall be maintained for at least three to five days after construction, and the water can be injected 14 days later (7) avoid strong wind, direct sunlight, rain and low temperature damage below five degrees above zero within 48 hours after the application of waterproof coating, and forbid people to walk within 12 hours After the cement-based permeable crystalline waterproof coating is used in the sewage treatment plant project in Mentougou District, it is observed that there is no water leakage at the construction joints of the new and old concrete, the bolt holes through the wall and other places, and it is worth mentioning that the thickness of the first floor of the regulating pool underground is only 200 mm (according to the provisions of the new national underground waterproof construction specification, the thickness of the waterproof concrete section is not less than 250 mm ）And the underground layer is a water layer After the cement-based permeable crystalline waterproof coating is used, the original leakage points gradually heal until no leakage occurs The inorganic waterproof coating is non-toxic, which has strong advantages in anti permeability, anti freezing, prevention of alkali aggregate reaction and chemical damage of concrete pool structure, with large investment at one time, but can produce permanent protection for concrete structure, so the author thinks that the application of inorganic waterproof coating in concrete structure waterproof will be more and more extensive Home of coatings is specialized in coatings, diatom mud, paint coating, 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