A kind of composite concrete expansion agent

Abstract

The invention discloses a composite concrete expansion agent, which relates to the technical field of concrete and mortar. The expansion agent is composed of the following raw materials in parts by weight: 60-70 parts of quicklime, 12-16 parts of sulfur-aluminum cement, and 18-24 parts of anhydrite parts, water retaining agent 0.4‑0.6 parts. The expansion agent of the present invention is mainly used to prepare shrinkage-compensating concrete and grouting materials. Its function is to reduce and eliminate concrete shrinkage cracks. Its main feature is that it expands early and has obvious vertical expansion. The 24h limit expansion rate can reach 0.007-0.011 %; the three-day limit expansion rate can reach 0.065-0.070%; the dry shrinkage is low, and the expansion rate can be restored to 95-100% after watering and curing; the raw materials are easy to obtain, and the preparation method is simple; the curing conditions are simple and do not need to be soaked in In the water, it only needs to be sprayed 2 to 3 times a day, and the expansion rate can reach more than 95% of the water storage and maintenance effect.

Description

technical field [0001] The invention relates to the technical field of concrete and mortar, in particular to a composite concrete expansion agent. Background technique [0002] Expansion agents have been used in concrete engineering for decades, the main purpose is to solve the problem of concrete shrinkage cracks. [0003] In the 1980s, UEA expansion agent began to be available on the market, and the expansion rate was 0.025% (7 days in water). Around 2010, expansion agents with a 7-day expansion rate of more than 0.05% appeared on the market, such as HCSA. This expansion agent has an obvious effect of compensating for shrinkage, and concrete cracking is greatly reduced, but the price is high, and production requires special calcination equipment (rotary kiln). ), HCSA expansion agent raw meal itself also needs ingredients. After burning clinker in a large rotary kiln, it needs secondary batching and grinding before it can be made into expansion agent. It is difficult to p...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the present invention provides a composite concrete expansive agent to solve the problems of existing concrete expansive agents, such as poor early compensating shrinkage effect, small expansion rate after stopping wet curing, and even absolute shrinkage, resulting in cracks in the later concrete structure, high price, and high price. high production requirements

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