基于实体监测的混凝土导热系数分析

Thermal conductivity of concrete based on in-situ monitoring

大体积混凝土内部温度场与裂缝息息相关，混凝土导热系数是分析温度场最重要的参数。调研了导热系数试验方法，包括：圆柱体法、防护热板法、热流计法，各种方法测得的导热系数介于0．37—3．99w／（m·K）。根据安仁铺船闸输水廊道侧墙混凝土温度监测结果，将混凝土构件简化为圆柱体进行导热系数计算，得到混凝土整体的导热系数为0．23w／（m·K）。利用计算得到的导热系数进行有限元模拟，计算结果与实际监测结果基本吻合。

The temperature distribution is closely related to the crack of large volume concrete, and the thermal conductivity of concrete is the most important parameter for the analysis of the temperature distribution. This paper investigates the test method of thermal conductivity, including the cylinder method, guarded hot plate method, and heat flow meter method, and the test results are between 0. 37 - 3.99 W/（ re.K）. According to the temperature monitoring results of Anrenpu lock, we simplify the component as a cylinder for the calculation of thermal conductivity, and the calculated thermal conductivity is 0. 23 W/（ re.K）. The calculated thermal conductivity is used for finite element simulation of temperature distribution inside the component, and the calculated results coincide well with the actual monitoring results.