Concrete expansive agent and preparation method thereof

Abstract

The invention provides a concrete expansive agent. The concrete expansive agent is composed of limestone, magnesite, gypsum, iron residues and disperse ash. The invention simultaneously provides a preparation method of the concrete expansive agent. The preparation method comprises the steps of preparing raw materials, roasting clean coal, quenching, grinding, selecting and packaging. The concrete expansive agent prepared by the invention has high expansion rate, anti-weathering ability of clinkers and anti-crack and anti-penetration capability.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a concrete expansion agent and a preparation method thereof. Background technique [0002] Concrete expansion agent is a kind of chemical admixture, which is added to concrete. When the concrete sets and hardens, the volume expands accordingly, which plays the role of compensating shrinkage, tensioning steel bars to generate prestress and fully filling concrete gaps. At present, most of the existing expansion agents in China are calcium vanadite type expansion agents with calcium sulfoaluminate hydrate as the main expansion source. Calcium oxide as an expansion clinker was first invented and popularized in Japan, but in use Calcium percalcium oxide with dense and non-porous crystal structure is easy to be produced during the process. The reactivity of this percalcined calcium oxide is low, and the hydration reaction lasts for a long time, which will destroy the structure of concrete and a...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of single expansion source and easy dead burning of concrete expansion agent, we propose a concrete expansion agent and its preparation method, which can have good clinker expansion rate, anti-weathering ability, anti-crack and anti-seepage Function

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