采用膨胀自动测定仪和电阻应变仪测定了水泥石的膨胀率和膨胀应力，研究了游离氧化钙在不同温度条件下对水泥石膨胀行为的影响规律，发现水泥石的膨胀行为实质上反映了其内部的应力匹配，它不仅与膨胀组分的含量和活性有关，还取决于水泥石自身结构的粘聚应力． The expansion rate and expansion stress of cement stone were measured by using an automatic expansion tester and a resistance strain gauge. The effect of free calcium oxide on the expansion behavior of cement stone under different temperature conditions was studied. It was found that the expansion behavior of cement stone substantially reflected its Internal stress matching, which is not only related to the content and activity of the expansion component, but also depends on the cohesive stress of the cementitious structure itself.