多孔建筑材料冻融现象研究中孔隙水冻结点的确定方法

为了定量地研究发生在多孔材料中的冻融现象，必须首先确定贮存在多孔材料中的液态水的冻结点。戌自由水不同，含湿多孔材料中孔隙水的冻地点是温度和液态水含量的函数，通过理论分析，提出了一种利用吸力势曲线或孔隙分布率曲线确定孔隙水冻结点的方法，这一方面已被应用到计算多孔材料冻融过程的模拟计算程序之中，大量的计算结果证明，该方法是有效的，作为该方法的应用，文中给出了一个模拟加气混凝土屋顶中结冰过程的计算实例。

Determination of freezing point during study on freezing and thawing of porous building materials

In order to quantitatively study freezing and thawing in porous matericals, it is necessary to determine the freezing point of the water in the materials. Different from bulk water, the freezing points of the pore water in a moist porous material is a function of temperature and liquid water con- tent. In this paper, a method is introduced to use the suction curve or the pore size distribution curve for determining the freezing point. This method has been used in a computer code for simulating freezing and thawing in porous materials. The results obtained from this program proved that the method is effective. As an example, a simulation is presented for the ice forming process in a gas concrete flat roof