A kind of composite internal curing shrinkage reducing and anti-cracking agent for concrete and production method thereof

Abstract

The invention discloses a composite internal curing shrinkage-reducing and anti-cracking agent for concrete and a production method thereof, belonging to a concrete additive. In parts by weight, including: modified expansion agent, acrylic modified polypropylene fiber, graphene oxide and polycarboxylate water reducing agent. In the present invention, by using graphene oxide as the adsorption point, acrylic modified polypropylene fiber is adsorbed to form a three-dimensional network dendritic capillary structure, and numerous uniformly distributed micro-reservoirs are formed inside the concrete, so as to promote the cementation material to the greatest extent. hydration reaction, and significantly improve the deformation properties, crack resistance and durability of concrete.

Description

technical field [0001] The invention relates to a concrete additive, in particular to a composite internal curing shrinkage-reducing and anti-cracking agent for concrete and a production method thereof. Background technique [0002] During the normal use of cement concrete, various damages will inevitably occur, such as cracks, deformation, joint damage, etc. Among them, crack damage accounts for the largest proportion and exists in almost all concrete structures. Cracks in concrete are initially microscopic cracks, which have little effect on the overall structure. However, under the combined action of internal and external factors, these microscopic cracks will gradually expand into macroscopic cracks, which will damage the concrete and form through cracks, deep cracks, and broken plates. Such serious damage will seriously affect the structural integrity and bearing capacity of the concrete pavement. [0003] The reasons for the formation of concrete cracks are extremely ...

AI Technical Summary

Problems solved by technology

The expansion agent mainly compensates the shrinkage of the concrete in the hardening stage through chemical action, but has little effect on inhibiting the early plastic shrinkage of the concrete; while the synthetic fiber has an obvious effect on controlling the early plastic shrinkage and cracking of the concrete, but it is difficult to prevent the plastic shrinkage and cracking in the hardening stage. help

[0005] Therefore, only a single addition of expansion agent or synthetic fiber cannot completely solve the crack problem of concrete

At present, there is also a double-mixing technology of adding expansion agent and synthetic fiber in engineering applications. During concrete construction, fiber and expansion agent are added as independent components at the concrete mixing station or construction site. Since the mixing ratio of the two materials has not been changed Optimization, there is a certain degree of randomness, and the best adding effect cannot be obtained

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