Composite internal-curing shrinkage-reducing anti-cracking agent for concrete and production method of composite internal-curing shrinkage-reducing anti-cracking agent

Abstract

The invention discloses a composite internal-curing shrinkage-reducing anti-cracking agent for concrete and a production method of the composite internal-curing shrinkage-reducing anti-cracking agent, and belongs to concrete additives. The agent is prepared from the following components in parts by weight: a modified expanding agent, acrylic acid modified polypropylene fibers, graphene oxide and a polycarboxylic acid water reducing agent. The graphene oxide is used as an adsorption point to adsorb acrylic acid modified polypropylene fibers to form a three-dimensional network branch-tendril-shaped capillary structure, and countless uniformly-distributed micro water storage tanks are formed in the concrete, so that the hydration reaction of a cementing material is promoted to the greatest extent, and the deformation performance, the crack resistance and the durability of the concrete are obviously improved.

Description

technical field [0001] The invention relates to a concrete additive, in particular to a composite internal maintenance shrinkage-reducing 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. The cracks in concrete are microscopic cracks at first, which have little effect on its overall structure, but under the joint action of internal and external factors, these microscopic cracks will gradually expand into macroscopic cracks, and then damage the concrete, forming through cracks, deep cracks, and broken plates. Such serious damages seriously affect the structural integrity and bearing capacity of the concrete pavement. [0003] The reasons for the formation of concrete cracks are extremely complex, w...

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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