Composite anti-cracking agent for super-long mass concrete and preparation method of composite anti-cracking agent

Abstract

The invention discloses a composite anti-cracking agent for super-long mass concrete and a preparation method of the composite anti-cracking agent. The composite anti-cracking agent is prepared from the following raw materials: 60%-70% of an expansion component, 10%-20% of a hydration heat regulating component, 10%-20% of a composite admixture, 5%-10% of a water reducing component and 0.5%-1.0% of anti-cracking fibers. The expansion component is formed by mixing a calcium expansion component and a magnesium expansion component, and the composite admixture is prepared from the following raw materials: calcined diatomite, active zeolite powder and phosphorus slag powder. The hydration heat regulating and controlling component is prepared by modifying beta-cyclodextrin. The invention also provides a preparation method of the composite anti-cracking agent. The concrete shrinkage can be effectively compensated in the whole course, the concrete temperature rise rate is reduced, the concrete cracking risk is reduced, the impervious performance and durability of the concrete are improved, the influence on the setting time is small, and the later strength of the concrete is not influenced; and the composite anti-cracking agent is especially suitable for building engineering with high cracking risk, such as mass concrete, side wall and bottom plate concrete and high-strength concrete.

Description

technical field [0001] The invention relates to an anti-cracking agent for concrete, in particular to a composite anti-cracking agent for super-large-volume concrete, which belongs to the field of building materials, and also relates to a preparation method of the composite anti-cracking agent for super-large-volume concrete . Background technique [0002] my country's urban rail transit is developing rapidly, and urban rail transit has become a project to realize green travel. It has higher requirements on population, cost and engineering construction. The concrete of the main structure of the underground station of urban rail transit is affected by factors such as large cross-section, large volume, super-long structural form and construction technology. Leakage problems, especially in areas with a lot of rain and high groundwater levels in the south, are particularly prominent. Although some parts have been repaired and treated, water seepage has not been cured. [0003...

AI Technical Summary

Problems solved by technology

[0006] The above technologies have not given specific guidance on how to make the anti-cracking agent effectively compensate the shrinkage of concrete throughout the process, reduce the rate of concrete hydration temperature rise, greatly reduce the risk of concrete cracking, and improve the durability of concrete.

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