改性材料对生土砌块湿热性能的影响

Influence of Modified Materials on Hygrothermal Properties of Raw Soil Block

关键词:  生土砌块  改性  吸湿率  导热系数

Key words:  raw soil block  modification  moisture absorption rate  thermal conductivity

摘要:

采用动态试验法和稳态平板法,研究了改性材料对生土砌块吸湿性能和导热系数的影响.结果表明：生土砌块的初始吸湿率、平衡含湿量和60h吸湿率均随着相对湿度的增加而增加;当相对湿度为40%和60%时，复合改性生土砌块的平衡含湿量均大于石灰改性和水泥改性生土砌块;生土砌块的导热系数随着平衡含湿量的增加而增加;石灰改性和复合改性生土砌块的平衡含湿量、导热系数和干密度随着石灰掺量和纤维掺量的增加而降低;水泥改性生土砌块平衡含湿量随着水泥掺量的增加而降低,与导热系数和干密度的变化趋势相反.

Abstract:

The influence of modified materials on the moisture absorption and thermal conductivity of raw soil blocks was studied by dynamic test and steady state flat plate method. The results show that the initial moisture absorption ratio, equilibrium moisture content and 60h moisture absorption ratio increases with the increase of relative humidity. When the relative humidity is 40% and 60%, the equilibrium moisture content of composite modified raw soil block is greater than that of lime and cement modified raw soil blocks. The thermal conductivity of raw soil block increases with the increase of equilibrium moisture content. The equilibrium moisture content, thermal conductivity and dry density of lime modified and composite modified raw soil block increase with the increase of lime content and fiber content. The equilibrium moisture content of cement modified raw soil block decreases with the increase of cement content, which is opposite to the change trend of thermal conductivity and dry density.