加气混凝土及其它混凝土制品中的孔隙是影响混凝土性能的重要因素之一,孔隙的种类、数量、孔径大小及分布等参数与混凝土的抗压、抗冻、抗渗等性能有密切关系,通过测孔亦可检查外加引气剂、减水剂等的使用效果。目前用显微镜方法及现代电子仪器分析方法测定的是指直径在2μm 以上的较大气孔,不包括极微细的毛细孔、凝胶孔 The porosity in aerated concrete and other concrete products is one of the important factors affecting the performance of concrete. The types, quantity, pore size and distribution of pores are closely related to the properties of concrete such as pressure resistance, frost resistance and impermeability. The hole measurement can also check the effect of the addition of air-entraining agent and water-reducing agent. Current microscopic methods and modern electronic instrument analysis methods refer to large pores with a diameter of 2 μm or more, excluding fine capillary pores, gel pores,