Method for determining mass concrete cooling rate dynamic limit value

Abstract

The invention discloses a method for determining a mass concrete cooling rate dynamic limit value. The method comprises the following determination steps: S1, obtaining external constraint stress anda relative deformation value of a concrete pouring body according to the thickness, the length and the age range of the concrete pouring body, and calculating the equivalent temperature of the relative deformation value; S2, according to the equivalent temperature of the external constraint stress and the relative deformation value, obtaining the comprehensive cooling difference increment of the concrete pouring body at different lengths and different ages S3, obtaining the cooling rates of different lengths and different ages by integrating the cooling difference increment and the ages; and S4, making a list of concrete cooling rate limit values at different lengths and different ages, and drawing a concrete cooling rate limit value curve graph. The concrete cooling rate standard can be formed, a visual chart is provided for on-site constructors, the constructors can take positive intervention measures conveniently, an on-site monitoring system is optimized, and intelligent development of construction engineering construction can be promoted.

Description

technical field [0001] The invention relates to the technical field of engineering construction, and more specifically relates to a method for determining the dynamic limit value of the cooling rate of mass concrete. Background technique [0002] After the mass concrete pouring body is poured, due to the hydration heat reaction of the concrete, the temperature of the concrete pouring body rises to the maximum temperature and then the temperature decreases. When it is easy to cause concrete cracking. In the existing construction technology, take measures such as optimizing raw materials, optimizing the mix design, reducing the temperature of raw materials, shortening the transportation time, taking heat insulation measures, choosing nighttime construction to reduce the mold entry temperature, or using layered pouring to reduce the temperature through cooling water. The highest temperature rise to reduce the temperature difference between the concrete and the environment, or ...

AI Technical Summary

Problems solved by technology

However, in the early stage of concrete pouring, there will still be situations where the on-site temperature measurement meets the cooling rate limit requirement of 2°C / d, but concrete cracking occurs. Among them, the cooling rate limit of 2°C / d is too strict, which leads to too long curing process of the concrete pouring body in the later stage, and the curing methods are too complicated, resulting in unnecessary waste of material and human resources, and affecting the construction progress of the site.

Images