| What requirements should inorganic sol type permeable crystalline coatings meet |
Inorganic sol is not used for ordinary aqueous solutions. Inorganic sol is composed of ultrafine particles with a diameter of 1nm-100nm dispersed in a dispersion medium, and there is a clear physical interface between the ultrafine particles and the dispersion medium. Its waterproof mechanism is a chemical reaction with free alkali in concrete, generating stable dendritic crystalline gel, which can effectively block micro cracks and capillary pores inside the concrete, making the concrete structure have long-lasting waterproof function, better compactness and compressive strength, and providing good breathability for the concrete. Concrete exposed to rainwater, salts, Ca2+, and chemical agents over the years will slowly corrode and deteriorate, even leading to structural failure. Inorganic sol type permeable crystalline coatings can greatly reduce the influence of these factors on concrete and provide long-term protection. At the same time, it can effectively prevent the erosion of concrete by acidic substances, oil stains, and engine oil. The inorganic sol used for concrete protection requires that the ultrafine particles contained in the inorganic sol have rigidity.
What requirements does the solid shield inorganic sol type permeable crystalline coating meet
a) Inorganic sol type permeable crystalline coatings are mainly rented for concrete structures below C40 or with poor impermeability. Before spraying, it should be shaken thoroughly without dilution.
b) Inorganic sol type permeable crystalline coatings should be sprayed in sections. The spray nozzle runs left and right. When the material on the facade flows, the speed of the spray nozzle should be increased and the distance from the nozzle to the wall should be increased. The spraying of the second section should cover 150mm of the previous section to prevent water leakage.
c) Before spraying construction, spray clean water on the concrete base surface, moisten, clean, and dry it before starting the spraying of inorganic sol type penetrating crystalline coating. If there is rapid penetration of the local concrete base surface, timely re spraying should be carried out. The penetration time of the material depends on the specific condition of the concrete. Usually, water is sprayed after 4-6 hours for curing to accelerate the infiltration rate and increase the completeness of crystallization.
d) After spraying, the concrete surface should be cleaned with clean water after being cured with water for 1-2 hours.
e) When the concrete strength is greater than C30 and the base layer is dense and smooth, the material dosage is 0.1kg/m2 to 0.13kg/m2. When the concrete strength is low and the base layer is rough and loose, the spraying amount is 0.3kg/m2 to 0.33kg/m2.
f) After the spraying operation is completed for 8 hours, the construction of the next process (such as earthwork backfilling) is allowed. After 72 hours of construction work, the closed water test can be conducted.
g) After spraying, white substances may sometimes appear on the surface of the concrete. The base can be cleaned with clean water and a brown brush.
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