大体积混凝土柱施工温度场监测与模拟研究

Study on Monitoring and Simulation of Temperature Field in Mass Concrete Column Construction

目前预拌大体积混凝土施工过程中的温度场研究大多以混凝土基础底板为研究对象,较少关注其他大体积混凝土构件的温度场分布与变化。因此,基于上海市徐汇区的某具体工程项目,开展了预拌大体积混凝土柱施工过程中的温度场监测与数值模拟研究。研究结果表明:预拌大体积混凝土柱各测点的入模温度较为接近,基本在35~38℃之间,内部温度最高可达87.7℃,出现在1 d之后。同时,预拌大体积混凝土柱的温度场演化受外界环境温度、边界约束条件等因素的影响显著。其中,入模温度对升温过程影响显著,混凝土导热系数与柱四周的对流系数对降温过程影响显著,水泥用量对升温和降温过程均影响显著。

In view of the current temperature field research in the construction of ready mixed mass concrete,most of the research objects are concrete foundation slab,and less attention is paid to the temperature field distribution and change of other mass concrete components.Therefore,based on a specific project in Xuhui District,Shanghai,the temperature field monitoring and numerical simulation during the construction of ready mixed mass concrete columns are carried out.The results show that the molding temperature of each measuring point of ready mixed mass concrete column is close,basically between 35~38℃,and the maximum internal temperature can reach 87.7℃,which occurs after 1 day.At the same time,the temperature field evolution of ready mixed mass concrete columns is significantly affected by external ambient temperature,boundary constraints and other factors.Among them,the molding temperature has a significant impact on the heating process,the thermal conductivity of concrete and the convection coefficient around the column have a significant impact on the cooling process,and the amount of cement has a significant impact on the heating and cooling process.