Heat preservation and moisturizing method for large-scale tunnel floor concrete

Abstract

The invention relates to a heat preservation and moisture retention method for base plate concrete of a large-size tunnel. The heat preservation and moisture retention method comprises the steps of after concrete is poured in a bin, covering the concrete bin surface by geotechnical cloth, and performing water flowing or scattering maintenance on the surface of the geotechnical cloth; after the concrete enters a cooling stage, under a condition of retaining the moisture of the surface, covering the surface of the geotechnical cloth by at least one layer of polyethylene thin film, and covering the polyethylene thin film by at least one polystyrene foam coiled material or at least one heat preservation quilt for maintenance. According to the heat preservation and moisture retention method, the heat preservation and moisture retention effect of the base plate concrete of the large-size tunnel can be enhanced, the quality is easily controlled, the cracking risk is reduced, the crack treatment cost is saved, the safety of the operating period is improved, and interferences on the concrete bin surface and the side surface are avoided; heat preservation and moisture retention are continuous, and the concrete performance is easy to guarantee; the heat preservation and moisture retention method is particularly suitable for temperature control anti-cracking construction of the base plate concrete of the large-size tunnel.

Description

technical field [0001] The invention relates to a heat preservation and moisture retention method for large-scale tunnel floor concrete, which belongs to the technical field of concrete maintenance. Background technique [0002] In the construction of large-scale tunnel floor concrete engineering, the selection of thermal insulation and moisture retention measures is not only related to the development of early strength of concrete, but also affects the internal temperature rise of concrete and the generation of surface cracks. Improper heat preservation method will lead to high maximum temperature of concrete, excessive temperature difference between inside and outside, and too fast cooling rate, resulting in temperature cracks; improper moisture retention method, concrete may lose water too fast, resulting in dry shrinkage cracks. However, the concrete structure of the floor of a large tunnel has higher requirements, and generally no temperature cracks are allowed, and the...

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, it is difficult to balance the two aspects of heat preservation and moisture retention at the same time, and it is easy to cause large-scale tunnel floor concrete to affect the performance of the concrete due to insufficient moisture retention and produce shrinkage cracks, or cause temperature cracks due to insufficient heat preservation and excessive temperature drop