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采用自主研制的超低温试验装置对不同低温情况下的立方体混凝土试块进行试验,测定试块中心点温度变化情况。根据已有研究成果,推测出低温及超低温情况下混凝土的导热系数、比热容。模拟混凝土试块低温及超低温情况下的温度场分布。不断调整导热系数和比容值,最终得到与实测数据吻合度较高的模拟降温曲线,则该组数据即可认为是混凝土的实际热学参数。结果表明,导热系数随温度的降低而增大,比热容随温度降低而减小,两者与温度变化呈近似线性关系。
The self-developed ultra-low temperature test device is used to test cube concrete blocks under different low-temperature conditions to determine the temperature change of the center of the test block. According to the existing research results, it is deduced that the thermal conductivity and specific heat capacity of concrete under the conditions of low temperature and ultra-low temperature. TEMPERATURE FIELD DISTRIBUTION OF SIMULATED CONCRETE UNDER LOW TEMPERATURE AND ULTRA LOW TEMPERATURE. Continuously adjust the thermal conductivity and specific volume values, and finally get the simulated cooling curve with a high degree of agreement with the measured data, then the set of data can be considered as the actual thermal parameters of concrete. The results show that the thermal conductivity increases with the decrease of temperature, and the specific heat decreases with the decrease of temperature. The two are approximately linear with the change of temperature.