A kind of composite concrete anti-cracking agent and preparation method thereof

Abstract

The invention provides a composite concrete crack-resisting agent, and belongs to the technical field of building materials, the crack-resisting agent is prepared from the following components in percentage by mass: 3-7% of polypropylene glycol, 7-10% of polyvinyl alcohol, 1-3% of VAE emulsions, 0.01% of defoaming agent, 10-15% of nan-zinc oxide, 3-5% of methyl sodium silicate and the balance of water, the preparation method includes the steps of 1) adding polyvinyl alcohol into cold water to overflow to-be-volatilized substances, increasing the temperature through water-bath heating to accelerate dissolution, insulating heat until the solution does not contain microparticles, filtering the solution, and lowering the temperature to room temperature for standby use; 2) evenly stirring polypropylene glycol, the VAE emulsions and the water to obtain mixed liquid A; 3) putting polyvinyl alcohol solution and the mixed liquid A in a stirrer, adding nano-zinc oxide, methyl sodium silicate andthe defoaming agent, and performing uniform stirring to obtain the concrete crack-resisting agent, the composite concrete crack-resisting agent has the advantages that surface moisture evaporation ofconcrete can be inhibited obviously, plastic shrinkage of the concrete can be reduced, surface cracking of the concrete can be resisted, and durability of the concrete can be improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a composite concrete anti-cracking agent and a preparation method thereof. Background technique [0002] Concrete is the most widely used and most important basic material in construction engineering; its advantages such as high compressive strength, simple construction, wide source of materials, and low price make it an irreplaceable position; however, it also has plastic shrinkage When it is easy to crack, it leads to defects such as insufficient anti-seepage ability, resulting in insufficient durability of concrete, which directly affects the service life of concrete buildings. It is almost impossible to completely avoid cracks in engineering. Although the shrinkage of concrete is not large, cracks will accelerate the carbonation rate of concrete, and also provide channels for air and water penetration, resulting in a series of frost heaving of concrete and corrosio...

AI Technical Summary

Problems solved by technology

However, in a harsh environment, the curing agent sprayed on the concrete surface will be damaged, the film-forming effect is poor, and the expected effect cannot be achieved, and manual spraying is required, which is time-consuming and laborious

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