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基于改进的光杠杆系统和护热平板法测定了水泥混凝土的线膨胀系数和导热系数,分析了粗集料类型以及粗集料含量对二者的影响。结果表明:粗集料类型不同时,集料本身的线膨胀系数越大,该种集料的混凝土线膨胀系数也越大,导热系数变化规律相同;粗集料类型相同时,线膨胀系数随集料含量增加而增大,而导热系数变化规律相反。此外,在10～50℃范围内逐级升高或降低相同温度时,混凝土膨胀量大致相同,膨胀量对不同温度区间的敏感性无明显差异。
The linear expansion coefficient and thermal conductivity of cement concrete were measured based on the improved optical lever system and the hot plate method. The effects of coarse aggregate type and coarse aggregate concentration on both were analyzed. The results show that when the types of coarse aggregate are different, the larger the linear expansion coefficient of the aggregate itself, the larger the linear expansion coefficient and the thermal conductivity of the aggregate. When the type of coarse aggregate is the same, the linear expansion coefficient Aggregate content increases and increases, while the thermal conductivity changes in the opposite. In addition, when the same temperature is raised or lowered step by step in the range of 10 ~ 50 ℃, the expansion of concrete is almost the same, and there is no significant difference in the sensitivity of expansion between different temperature ranges.