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以化学分析硅酸盐自应力水泥石及其压力管中剩余石膏含量为主,并配合性能试验及X射线、电子显微镜、差热分析等方法,探讨了硅酸盐自应力水泥及其压力管在水化、硬化过程中的膨胀规律;提出了剩余石膏的控制范围。硅酸盐自应力水泥的主要水化产物是钙矾石、水化硅酸钙凝胶、氢氧化钙。在石膏接近消耗完的情况下还形成了一硫酸盐型水化硫铝酸钙。在主要膨胀阶段,硅酸盐自应力水泥石的膨胀相是钙矾石。在我国目前硅酸盐自应力水泥压力管的制管工艺条件下,蒸养后下水前的剩余SO_3如控制在1.50～2.10％间,水养出水时的剩余SO_3如控制在0.60％以下,就可保证这种水泥的压力管在水养阶段和使用过程中不会发生胀坏现象。
The chemical analysis of silicate self-stressed cement and its residual gypsum in the pressure pipe are the main components. Combined with performance tests and X-ray, electron microscopy, and differential thermal analysis methods, the silicate self-stressing cement and its pressure pipe are discussed. In the process of hydration and hardening, the law of expansion is proposed; the control range of the remaining gypsum is proposed. The main hydration products of silicate self-stressed cements are ettringite, hydrated calcium silicate gels, and calcium hydroxide. A calcium sulphate hydrated calcium sulphoaluminate is also formed when the gypsum is nearly consumed. In the main expansion stage, the swelling phase of the silicate self-stressing cement stone is ettringite. In China, the remaining SO 3 of the silicate self-stressing cement pressure pipe is controlled between 1.50 and 2.10%, and the residual SO 3 when water is used to raise the water is controlled below 0.60%. It can ensure that the pressure pipe of this cement will not bulge in the water-holding stage and during use.