自然干燥状态下粉煤灰蒸压加气混凝土砌块导热系数实验研究

摘要

Moisture content of fly ash autoclaved concrete blocks (ACB) affects not only the thermal conductivity seriously but also the building operational energy consumption and indoor thermal or humid environment. The moisture content of ACB changes with time in natural drying environment. The thermal conductivity and moisture content of ACB are tested by stages in experiment natural environment. Then we get variation laws of thermal conductivity and moisture with time in the natural environment. The function of fly ash autoclaved concrete block's thermal conductivity to moisture content is fitted based on nonlinear least square method. The research results will provide basis and reference for studying on building energy consumption and indoor thermal or humid environment affected by fly ash autoclaved concrete blocks' thermal conductivity and moisture content in natural environment.%粉煤灰蒸压加气混凝土砌块的含水率对导热系数有较大的影响,从而影响到建筑运行能耗和室内热湿环境.自然干燥状态下砌块的含水率随时间不断变化,通过对实验室自然干燥状态下不同时间段的粉煤灰蒸压加气混凝土砌块含水率和导热系数的实验测试,得出了导热系数、含水率随静置时间的变化规律,并运用非线性最小二乘法拟合得出了导热系数-含水率函数,为进一步研究粉煤灰蒸压加气混凝土砌块自然干燥状态对建筑能耗和室内热湿环境的影响提供参考依据.