大体积混凝土浇筑时温度裂缝指数影响因素分析
Analysis of Factors Influencing the Temperature Crack Index in Mass Concrete Pouring
陈占毅1
作者信息
- 1. 广州市道路事务中心,广东 广州,510000
- 折叠
摘要
以某变截面连续梁桥桥墩浇筑施工为背景,基于有限元软件Midas FEA非线性求解模块,从混凝土浇筑阶段、水泥类型及浇筑模板材料三方面对混凝土浇筑时温度裂缝指数影响因素进行分析.结果表明:采用低热水泥浇筑能够有效延缓温度应力达到峰值的时间,浇筑完成后混凝土温度应力维持在0.2 MPa左右的较低水平,最小温度裂缝指数为0.921 2,满足限制混凝土浇筑时有害裂缝发生的裂缝指数要求.因此,大体积混凝土浇筑时应重点关注水泥的发热性能,采用低热水泥或做好冷却措施能够有效减少温度裂缝的发生,对大体积混凝土浇筑施工具有指导意义.
Abstract
This study takes the construction of a variable cross-section continuous beam bridge pier as the background,and uses the nonlinear solver module of Midas FEA finite element software to analyze the factors affecting the temperature crack index during concrete pouring from three aspects:the pouring stage of concrete,the type of cement,and the pouring formwork material.The results indicate that using low heat cement for pouring can effectively delay the time at which temperature stress reaches its peak.After pouring,the temperature stress of the concrete is maintained at a relatively low level of about 0.2 MPa,with the minimum temperature crack index at 0.9212,which meets the requirements for limiting harmful cracks during the concrete pouring process.Therefore,during large volumes of concrete pouring,it is crucial to focus on the heat generation characteristics of cement.The use of low heat cement or appropriate cooling measures can effectively reduce the occurrence of temperature cracks,providing valuable guidance for the construction of large-volume concrete pouring.
关键词
大体积混凝土/水化热/温度场/应力场/温度裂缝指数Key words
mass concrete/hydration heat/temperature field/stress field/temperature crack index引用本文复制引用
出版年
2024
NETL
NSTL
万方数据