Cementitious capillary crystalline waterproofing coating, preparation method and using method thereof

Abstract

The invention discloses a cementitious capillary crystalline waterproof coating, a preparation method and a using method thereof. The coating comprises the following components in parts by weight: 45-50 parts of 42.5 ordinary Portland cement, 45-50 parts of 70-120 mesh quartz sand, 1.5-2 parts of a dispersible latex powder, 2-2.5 parts of capillary crystalline masterbatch, 0.1-0.2 part of hydroxypropyl methylcellulose, and 0.2-0.3 part of an organosilicone antifoaming agent, wherein the capillary crystalline masterbatch comprises the following raw materials in percent by weight: 30-55% of barium oxide, 10-15% of magnesium nitride, 5-10% of chromium sulfate dodecahydrate, 5-10% of copper sulfate, 15-20% of magnesium sulfate, and 10-15% of maleic acid-acrylic acid copolymer sodium salt. Thewaterproof coating is applied to the surface of a concrete structure, and capillary crystallization is carried out with water, so that impermeability of the concrete is improved; dormancy is carried out without water, and thereby the coating has secondary impermeability; cracks of 0.4 mm or less on the concrete surface can be repaired; the coating is high temperature resistant and freeze-thaw resistant; a coating layer is solid, and subsequent engineering construction without an additional protective layer can be directly performed on the coating layer; and the coating is non-toxic and environment-friendly, and has air-permeability.

Description

technical field [0001] The invention belongs to the technical field of waterproof coatings, and in particular relates to a cement-based permeable crystalline waterproof coating, a preparation method and a use method thereof. Background technique [0002] Cement-based permeable crystalline waterproof coatings are mainly composed of Portland cement, selected quartz sand, special active chemical substances, etc., which are gray powder materials. It is transported and filled in the concrete micropores and capillaries, and undergoes physical and chemical reactions to form water-insoluble dendritic crystals. The crystals are combined with the concrete structure to form a closed waterproof layer as a whole, blocking water flow from any direction and other liquid erosion. In order to achieve the purpose of permanent waterproof and chemical corrosion resistance, at the same time, it can protect the steel bars and enhance the strength of the concrete structure. [0003] The existing ...

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Problems solved by technology

[0003] The existing cement-based osmotic crystalline waterproof coatings mainly use calcium sulfate, calcium chloride, sodium silicate, aluminum silicate, citric acid and its metal salts, stearates, etc. as osmotic crystalline masterbatches, and the types of active masterbatches It is relatively simple, and its permeability, crystallization performance and waterproof performance need to be further improved

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