蒸压加气混凝土砌块的吸水特性研究

Water Absorption Characteristics of Autoclaved Aerated Concrete

采用毛细吸水试验对加气混凝土砌块的吸水性进行了研究,发现加气混凝土砌块的吸水高度与时间满足i=a+s×t1/2的函数关系,对函数中各系数的物理意义及其影响因素进行分析探讨。结果表明:常数a主要由加气混凝土砌块表层状况及其孔半径决定;毛细吸水系数s主要取决于加气混凝土砌块的总孔隙率、连通孔数量及孔的分布;结合加气混凝土砌块孔结构测试数据,分析了毛细吸水率与砌块内部的连通孔、气孔孔径大小及孔径分布等因素之间的关系。

Water absorption property of autoclaved aerated concrete （AAC） was investigated by capillary suction method. It was found that the inflow height （ i ） of water in aerated concrete by capillary suction effect was a function of the elapsed time （ t ）, i.e. i α ＋ s × t1/2. Based on the theory of Laplace and characteristics of aerated concrete, the physical implication of the parameter ＂a＂ and ＂s＂ in the formula and their influencing factors were discussed. The results showed that ＂a＂ was mainly de- pended on the pore radius of the surface layer of aerated concrete and ＂s＂ was determined by the total porosity, the quantity of connected pore and pore size distribution of aerated concrete. According to the observation of the profiles of macropores in aerated concrete, the relationships between capillary sorptivity and connected pores, pore size distribution of aerated concrete were investigated, by which the theoretical analysis mentioned above was proved to be appropriate.