石膏不同组份对孔隙率的影响

Theoretical analysis and experimental study on the effect of the different components of porous medium gypsum on porosity

通过多种方式配制石膏(CaSO4.2H2O)并测定其垂直吸水高度h、在水平状态下的输水速度u、孔隙率η及平均孔隙半径等物理性质,发现多孔介质石膏的上述特性与配制方法关系极大。石膏是由CaSO4加适量的水而形成2水硫酸钙(CaSO4.2H2O),随水量增加孔隙率增大而其强度下降。在水中加入少量柠檬酸钾配制时,会大大改善其多孔介质性能,垂直吸水高度、水平输水速度及孔隙率可分别达到:120cm、4.2mm/min及69.4%,可以作为毛细吸液芯辐射板的内填充物使用。

This paper uses a variety ways to prepare the gypsum（CaSO4·2H2O） and measured its physical properties,including vertical suction height h,the water velocity u in the horizontal state,the porosity η and the average pore radius.The results show that the way of preparation of the porous medium gypsum has great relationship with its properties.The gypsum is formed by adding some proper water into the CaSO4,and its porosity is increasing with the increase of the water,but the strength is decreasing.Adding a bit of potassium citrate in the water can improve the performance of the gypsum,and the vertical suction height,the water＇s horizontal velocity and the porosity can reach 120 cm,4.2 mm/min and 69.4% respectively,so the gypsum can be used as the filling materials of the capillary suction liquid core radiator.