大体积混凝土水化热损伤计算方法
Calculation method of heat damage by hydration of mass concrete
吕国儿 1汤群益 1王定仕 1李天昊 1诸云鹏 2陈达2
作者信息
- 1. 中国电建集团华东勘测设计研究院有限公司,浙江杭州 311122
- 2. 河海大学港口海岸与近海工程学院,江苏南京 210098
- 折叠
摘要
为更准确地判断浇筑过程中大体积混凝土内部的水化热损失,提出了综合考虑混凝土绝热温升、环境温度、入模温度、模板材料散热系数、保温材料散热系数和浇筑层厚这6个影响因素的混凝土浇筑过程中最不利时刻的温度分布预测公式,并采用响应面分析法率定公式中的参数,基于温度分布及Loland损伤模型提出了一种水化热损伤计算方法,通过有限元数值模型对该方法进行了验证.结果表明,该方法能够判断浇筑过程中任意一点是否会因为温度梯度造成损伤开裂.
Abstract
In order to more accurately judge the loss of hydration heat inside the mass concrete during the casting process,a formula for the prediction of temperature distribution at the worst moment between surface and interior of concretes was established by considering six influencing factors,including the concrete adiabatic temperature rise,ambient temperature,casting temperature,heat dispersion coefficient of formwork material,heat dispersion coefficient of thermal insulation material and thickness of the casting layer.A damage calculation method of hydration heat was established based on the calibrated parameter from response surface analysis method,temperature distribution and Loland damage model,and then was verified by the finite element numerical model.The results show that the hydration heat damage equation can determine whether the damage cracking will be caused by temperature gradient at any point during the casting process.
关键词
温度损伤/大体积混凝土/水化热/温度梯度/响应面分析Key words
temperature damage/mass concrete/heat of hydration/temperature gradients/response surface analysis引用本文复制引用
基金项目
中国电建集团华东勘测设计研究院有限公司科技立项项目(KY2021-XNY-02-05)
出版年
2024
国家科技期刊平台
NSTL
万方数据