摘要
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。与自由水不同，含湿多孔材料中孔隙水的冻结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。这一方法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。
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
出处
《哈尔滨建筑大学学报》
北大核心
2001年第3期91-95,共5页
Journal of Harbin University of Civil Engineering and Architecture
基金
德国联邦科研基金会(DFG)资助项目(0402-030)
关键词
冻融
冻结点
多孔材料
孔隙水
多孔建筑材料
freezing and thawing
freezing point
porous material
pore water
ice forming
suction potential
freezing temperature
maximum unfrozen water content
