Preparation method of concrete expanding agent

Abstract

The invention discloses a preparation method of a concrete expanding agent, and relates to the technical field of expanding agents, and the preparation method of the expanding agent comprises the following steps: S100, preparing raw materials; S101, mixing the raw materials; S102, preparing auxiliary materials; and S103, preparing the expanding agent. Modified polypropylene fibers are added into the raw materials of the expanding agent, so that the fracture toughness and the impermeability of concrete can be improved, and the expanding agent has good hydrophilicity, so that the dispersing performance and the adaptability of the expanding agent are good; meanwhile, through cooperation of modified kaolin, silica fume and steel slag, concrete raw materials can be saved, the production cost isreduced, and the strength of concrete is improved; the concrete expanding agent prepared by adopting the method has the advantages of high expansion rate, strong adaptability, good shrinkage compensation effect, high compression strength and high breaking strength, and is simple in preparation process, convenient to operate, relatively low in cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of expansion agents, in particular to a preparation method of a concrete expansion agent. Background technique [0002] Concrete expansion agent is used to prepare expansive concrete (including shrinkage compensating concrete and self-stressing concrete). Shrinkage compensating concrete can compensate concrete shrinkage and compact concrete, and improve concrete impermeability. It is mainly used in civil engineering for both waterproofing and crack resistance. In one aspect, it is often used in the preparation of high-grade waterproof concrete and the appropriate extension of expansion joints or post-pouring belt spacing. Ordinary concrete often leaks due to shrinkage and cracking, which reduces its use function and durability. Adding 8% to 12% expansion agent in the cement can be mixed into shrinkage-compensating concrete, which greatly improves the crack resistance and waterproof ability of the concrete s...

AI Technical Summary

Problems solved by technology

[0003] However, the actual use of concrete expansion agents currently on the market has high production costs, complex preparation processes, low expansion rates, poor shrinkage compensation, and unsatisfactory concrete fracture strength and impermeability, which cannot meet the existing requirements. market demand

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