以硫铝酸盐水泥为基体,配以适量石膏合成膨胀剂,通过大量显徽镜和扫描电镜观察及电子探针微区成分分析,均证明钙矶石以凝胶体形态出现。对国外关于钙矾石膨胀机理的晶体学说和胶体学说进行了论证,认为钙矾石的膨胀机理本质上是钙矶石凝胶吸水肿胀。 Using sulphoaluminate cement as the matrix and appropriate amount of gypsum synthetic expansive agent, a large number of microscopic and scanning electron microscopy observations and microprobe analysis of the electron microprobe showed that calcium sulphate cement appeared in the form of gel. The crystallographic theory and colloidal theory of the ettringite expansion mechanism in foreign countries are demonstrated. It is believed that the expansion mechanism of ettringite is essentially the swelling of the calcium iolite gel.