Sand pulp concrete waterproof agent and method for making same

Abstract

The invention relates to a mortar and concrete waterproofing agent. The waterproofing agent is characterized in that it contains the following components by weight: 70-90 parts of activated zeolite powder, 0.3-2 parts of silane coupling agent, 2-5 parts of stearic acid, and 0.007-0.05 parts of alkylphenol polyoxyethylene ether , 3-10 parts of magnesia lime, 1-6 parts of gypsum, and 5-10 parts of polypropylene fiber. The invention also relates to a preparation method of the above-mentioned mortar and concrete waterproofing agent. The waterproofing agent can not only improve the compactness, compressive strength and waterproof and impermeable performance of concrete; it can also prevent temperature difference cracks by delaying and reducing the heat release of hydration, and reduce the shrinkage of cement gel to reduce the drying shrinkage of concrete. Produce micro-expansion in concrete to compensate for shrinkage cracks and other ways to improve the crack resistance of concrete; at the same time, it can also improve the workability of mortar and concrete, effectively inhibit the alkali-aggregate reaction, and improve the long-term strength of concrete and enhance durability . It is especially suitable as an admixture for mortar and concrete.

Description

technical field [0001] The invention belongs to building material additives, in particular to a mortar and concrete waterproofing agent and a preparation method thereof. Background technique [0002] There are two main types of existing mortar and concrete waterproofing agents: organosilicon-based waterproofing agents and inorganic aluminum salt-based waterproofing agents. The main components of silicone waterproofing agent are sodium methyl siliconate (potassium) and sodium siliconate (potassium), which is a water-soluble polymer with a small molecular weight. The waterproof membrane of methyl silicone ether, the waterproof membrane is surrounded by the constituent particles of concrete and has hydrophobic properties. Since the volume of concrete will shrink due to cold shrinkage or dry shrinkage during the pouring hardening process, the main disadvantage of silicone-based waterproofing agents is that they cannot compensate for the shrinkage cracks of concrete, so the shri...

AI Technical Summary

Problems solved by technology

However, due to the early-strength and quick-setting effect of this type of waterproofing agent, the early-stage hydrate structure is formed faster, so the structure is less dense. The faster the early-stage strength of concrete increases, the lower the later-stage strength. The coagulation effect will adversely affect the later strength of cement mortar or concrete, and the impermeability is also poor; in addition, the calcium sulfoaluminate generated in the early stage of hydration will be converted into ettringite, and there are 32 A water molecule needs a lot of water when it is formed, especially in the early stage of concrete pouring. If the humidity is not enough, it will be difficult to make it reach the limit expansion value even if the curing time is prolonged, thus affecting the waterproof performance. Therefore, it is important for the early wet curing of concrete. The requirements are particularly high, which makes it difficult to control the construction quality; moreover, this type of waterproofing agent is mostly a liquid product, which is inconvenient to measure and transport during use

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