Concrete expanding agent and preparation method thereof

Abstract

The invention provides a concrete expanding agent and a preparation method thereof. The concrete expanding agent comprises the following raw materials in parts by weight: 330 to 450 parts of bauxite clinker, 500 to 600 parts of gypsum powder and 70 to 80 parts of a naphthalene-based efficient water-reducing agent; the raw materials are mixed to obtain the concrete expanding agent. The concrete expanding agent provided by the invention can prevent large-volume concrete cracking and improve permeability resistance, has micro-expansibility, can prevent concrete shrinkage and can resist water, resist seepage and resist cracking in engineering construction.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a concrete expansion agent and a preparation method thereof. Background technique [0002] In recent years, my country's concrete technology has developed rapidly, but during the construction process, the phenomenon of engineering cracks is increasing. Generally speaking, concrete causes cracks due to its own self-shrinkage, drying shrinkage, cold shrinkage, structural stress, construction technology and process, etc. The resulting cracks in the building reduce the life of the building and increase the risk of accidents. At present, the methods to solve concrete cracking and leakage at home and abroad, in addition to daily material selection and design of concrete construction technology, are mainly to add expansion agents to concrete to improve the crack resistance and impermeability of concrete, thereby improving the concrete. Durability, reducing cracking of concrete. Concr...

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Problems solved by technology

[0004] The invention proposes a concrete expansion agent and a preparation method thereof, which solves the problems of low expansion energy, large dosage, high alkali content and slow expansion rate in the existing concrete expansion agent

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