大体积混凝土墙板水化热及抗裂性能模拟分析  

Simulation analysis of heat of hydration and crack resistance of mass concrete wall panels

作　　者：段中剑 郭振雷 焦立颖 高志杰 DUAN Zhongjian;GUO Zhenlei;JIAO Liying;GAO Zhijie(Beijing Building Materials Academy of Sciences Research Co.Ltd.,Beijing 100041,China;BBMG Concrete Co.Ltd.,Beijing 100094,China)

机构地区：[1]北京建筑材料科学研究总院有限公司,北京100041 [2]北京金隅混凝土有限公司,北京100094

出　　处：《新型建筑材料》2023年第12期61-64,78,共5页New Building Materials

摘　　要：为防止某文物修复楼地下室大体积混凝土墙体产生温度裂缝,以地下室样板墙为模拟实例,结合修复楼地下条件与材料性能,进行水化热及抗裂性能模拟分析。结果表明:墙板混凝土在龄期1.2 d达到温度峰值63.2℃,最大温升为33.2℃,最大里表温差为14.4℃,最大表外温差为18.8℃,最大降温速率为7.2℃/d,降温速率不符合GB 50496—2018《大体积混凝土施工标准》中≤2.0℃/d的温控要求。墙板在受外部固定约束部位的长度方向边缘上棱边极易发生开裂,开裂龄期为3.2~6.3d,此阶段应做好保温、保湿等防裂措施。In order to prevent temperature cracks in mass concrete walls in the basement of a project's cultural relics restoration building,a simulation analysis of the heat of hydration and anti-cracking properties was carried out by taking the sample basement wall as a simulation example and combining the underground conditions of the restoration building with the material properties.The results show that the wall panel concrete reaches the temperature peak of 63.2℃at the age of 1.2 d,the maximum temperature rise is 33.2℃,the maximum temperature difference between the inner and outer surface is 14.4℃,the maximum difference between the outer and outer surface is 18.8℃,the maximum cooling rate is 7.2℃/d,and the cooling rate doesn't satisfy the requirement of temperature control index of 2.0℃/d of GB 50496—2018"Standard for construction of mass concrete".Wall panels in the external fixed constraints on the length of the edge of the edge is very easy to crack,the age of cracking is 3.2~6.3 d,in this stage heat preservation,moisturizing and other anti-cracking measures should be taken.

关 键 词：大体积混凝土 温度峰值 最大温升 降温速率 开裂指数 

分 类 号：TU528.7[建筑科学—建筑技术科学]