Self-compensating shrinkage concrete

Abstract

The invention discloses self-compensating shrinkage concrete. The self-compensating shrinkage concrete is prepared from, by mass, 6-18 parts of cement, 2-12 parts of fly ash, 2-12 parts of slag powder, 15-45 parts of natural sand, 15-50 parts of natural stone, 6-25 parts of aggregate, 5-10 parts of water, 0.8-2 parts of a composite superplasticizer, 0.5-5 parts of an expanding agent and 0.01-0.05part of an expansion synergist. The self-compensating shrinkage concrete has the advantage that the expanding agent and the expansion synergist are added in the concrete, so that the concrete has a self-compensating shrinkage property. Cellulose-based superabsorbent resin is further added, so that the synergistic action of the expanding agent, the expansion synergist and the cellulose-based superabsorbent resin achieves an ideal micro-expansion state for compensating shrinkage, thereby avoiding the problems of early shrinkage cracking and long-term larger shrinkage.

Description

technical field [0001] The present application relates to the technical field of concrete materials, in particular to a self-compensating shrinkage concrete. Background technique [0002] As the largest building material consumable, concrete materials can be divided into ordinary concrete, high-strength concrete, shotcrete, fiber concrete, high-performance concrete, recycled concrete, etc. according to different classification standards. [0003] During the initial setting or hardening process of concrete, due to the hydration or dehydration of the cement itself, the concrete structure will shrink, shrink and shrink in its own volume. When the shrinkage value is greater than the ultimate tensile value of the concrete, the structure of the concrete will be destroyed, resulting in cracking. As a new type of concrete admixture, concrete expansive agent can react with cement and water to produce crystals with larger volume, which can expand the volume of concrete and generate a...

AI Technical Summary

Problems solved by technology

For the calcium oxide expansion agent used in shrinkage compensation concrete, the hydration rate is too fast during the hydration process, which will generate a large amount of heat in a short period of time, which will lead to a higher temperature of the concrete and increase the cracking caused by the shrinkage of the concrete. risk, and will reduce the effective expansion energy of calcium oxide expansion agents

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