Modified calcium oxide cement concrete expansion agent and preparation method thereof

Abstract

The invention provides a modified calcium oxide cement concrete expansion agent and a preparation method thereof. The modified calcium oxide cement concrete expansion agent consists of acrylic resin and a calcium oxide expansion clinker, wherein the surface of the calcium oxide expansion clinker is wrapped with the acrylic resin; the mass of the acrylic resin accounts for 0.01 to 10 percent of the total mass of the modified calcium oxide cement concrete expansion agent; the specific surface area of the modified calcium oxide cement concrete expansion agent is 100 to 600m<2> / kg. According to the modified calcium oxide cement concrete expansion agent, a hydration process of the calcium oxide expansion clinker can be regulated, ineffective hydration in the plastic stage of concrete can be reduced, expansion after hardening can be increased, and the shelf life of the expansion agent product can be prolonged; the modified calcium oxide cement concrete expansion agent can be used for the crack resistance and seepage resistance of a concrete structure, and the durability of the concrete can be greatly improved.

Description

technical field [0001] The invention belongs to the field of concrete building materials, in particular to a modified calcium oxide cement concrete expansion agent and a preparation method thereof. Background technique [0002] Cement concrete is currently the largest building material in the world, with low price and wide application. However, cement concrete is easy to shrink and crack, and the cracks will cause the steel bars in the concrete to corrode, shorten the service life of the engineering structure, and seriously affect the durability of the concrete. In order to solve the problem that cement concrete is easy to shrink and crack, researchers have invented expansive cement or cement concrete expansion agent. [0003] Since the invention of expansive cement in France in the 1930s, especially since Japan separated the expansive component on the basis of expansive cement as a separate expansion agent, the concrete expansive agent has gradually developed into the larg...

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Problems solved by technology

[0007] Aiming at the problem that the calcium oxide expansion agent has strong hygroscopicity, reacts rapidly with water, and consumes too much expansion energy in the plastic stage of concrete, the present invention provides a modified calcium oxide cement concrete expansion agent and a preparation method thereof. Calcium oxide cement concrete expansion agent can adjust the hydration process of calcium oxide expansion clinker, reduce the invalid expansion of concrete in the plastic stage, and increase the expansion rate of concrete after hardening

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