B05级ALC墙体热湿性能实验研究

Experimental study on thermal and moisture performance of B05 grade ALC wall

蒸压轻质加气混凝土(ALC)的等温吸附曲线和导热系数是其热湿性能参数的重要指标。实验研究了25℃环境温度下B05级ALC的含湿率随周围环境相对湿度的变化关系,给出了等温吸附曲线及数学解析式。利用瞬态平面热源法测试了B05级ALC在不同平衡含湿率下的导热系数,拟合出实验条件下导热系数与平衡含湿率间的函数关系式。研究结果表明:ALC等温吸附曲线可由Peleg公式精确描述,其平衡含湿率增长速率随环境相对湿度增大而增大;ALC导热系数随平衡含湿率的增大呈指数型单调递增趋势,平衡含湿率越大,导热系数增长速率越快。

The isothermal adsorption curve and thermal conductivity of autoclaved lightweight concrete(ALC)are important indicators of its thermal and moisture performance parameters.The relationship between the moisture content of B05 grade ALC and the relative humidity of the surrounding environment at an ambient temperature of 25℃is studied experimentally,and the isothermal adsorption curve and mathematical analytical formula are given.The transient plane heat source method is used to test the thermal conductivity of B05 grade ALC under different equilibrium moisture content,and the functional relationship between thermal conductivity and equilibrium moisture content under the experimental conditions is fitted.The research results show that the ALC isothermal adsorption curve can be accurately described by the Peleg formula,and the growth rate of the equilibrium moisture content increases with the increase of the environmental relative humidity.The thermal conductivity of ALC shows an exponential monotonic increasing trend with the increase of the equilibrium moisture content,and the higher the equilibrium moisture content is,the faster the thermal conductivity growth rate is.