烘干温度对泡沫水泥性能的影响

Effect of Drying Temperature on Properties of Foam Cement

针对泡沫水泥在不同烘干温度下性能差异较大,研究了以普通硅酸盐水泥和硫铝酸盐水泥为主要胶凝材料的泡沫水泥在不同烘干温度下的含水率、抗压强度、拉伸强度和导热系数等性能变化规律,并通过TG-DSC和XRD对干燥过程中的物相变化进行了分析。结果表明:经80℃干燥之后导热系数基本为定值,在0.06 W/(m·K)左右;以硫铝酸盐水泥为主要胶凝材料的泡沫水泥由于干燥过程中钙矾石失去结晶水造成强度下降;以硅酸盐水泥为主要胶凝材料的泡沫水泥在105℃干燥过程中会生成Ca2Al3(SiO4)(Si2O7)O(OH)造成强度下降。

According to the performance differences between foam cement with the rapid hardening sulphoaluminate cement and that with ordinary portland cement for cementing material at different baking temperatures, we investigated the change laws of moisture content, compressive strength, tensile strength and thermal conductivity at various tempera- tures. The experimental results show that the thermal conductivity is constant for about 0.06 W/（m · K） ; the loss of lat- tice H2 O leads to the decrease of strength in the drying process; Ca2 Al3 （SiO4）（Si2O7 ）O（OH） formation leads to the de- crease of strength at drying temperature of 105℃.