Self-compacting freeze-thaw resistant concrete and preparation method thereof

Abstract

The invention discloses a self-compacting anti-freezing and anti-thawing concrete and a preparation method thereof. The self-compacting anti-freezing and anti-thawing concrete is composed of, by weight part, 290-360 parts of cement, 15.5-25.5 parts of additives, 130-180 parts of mineral admixture, 250-320 parts of fine aggregate, 500-700 parts of coarse aggregate, 80-120 parts of coal ash, 180-240parts of water, 8.6-12.8 parts of water reducer, 10-15 parts of adhesives and 10-20 parts of lignin fiber, wherein the additives are composed of anti-freezing agent, air entraining agent and swellingagent at a weight ratio of 1:2-3:0.7-1. The preparation method of the self-compacting anti-freezing and anti-thawing concrete comprises preparing a first mixture, preparing a second mixture and preparing a finished product. The self-compacting anti-freezing and anti-thawing concrete has the advantages of being good in peaceability, less prone to bleeding and segregation and high in anti-freezingand anti-thawing performance.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a self-compacting freeze-thaw resistant concrete and a preparation method thereof. Background technique [0002] Concrete is an indispensable and important engineering material in modern civil engineering. And self-compacting concrete is a kind of high-performance concrete. Its mixture has high fluidity without segregation and bleeding, and can level itself without vibration, and is filled with models and wrapped steel bars; its slump The time loss is small. Due to the low cement consumption of self-compacting concrete, the high utilization rate of waste slag and good construction performance, it can save waste, manpower and material resources, speed up the construction progress, reduce the overall cost of concrete, and solve the problem of disturbing people when pouring concrete, especially for difficult-to-use concrete. Pouring, even parts that cannot be pour...

AI Technical Summary

Problems solved by technology

[0004] Although the existing self-compacting concrete reduces the amount of cement and cementitious materials, comprehensively utilizes waste, reduces the processing cost of concrete, and the added aliphatic hydroxysulfonate high-efficiency water reducer increases the antifreeze performance of concrete , but the aliphatic hydroxysulfonate high-efficiency superplasticizer can only be used as an antifreeze agent at a fixed temperature of -5°C. When the concrete prepared in this case is in an environment lower than -5°C, the antifreeze-thaw effect is not good, making Concrete is prone to cracks and fine lines

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