硅灰掺量对超硫酸盐水泥水化进程的影响

The Influence of Silica Fume Content for Super Sulfate Cement Hydration Process

通过设计3％，5％，8％，10％4种不同的硅灰掺量配制超硫酸盐水泥（ SSC）。对其胶砂试样的力学强度进行了跟踪测试，并测试了试样自拌合加水后100h内的水化温升，借助扫描电子显微镜和X射线衍射分析仪对试样水化产物进行分析，得出硅灰不同掺量下SSC的力学性能、水化温升及水化产物的差异。结果表明：硅灰在SSC中掺量为3％～5％比较适宜，对SSC的力学性能和水化进程有促进作用；试样的水化过程最大的放热峰发生30～60h，随着硅灰的掺入，试样的最大水化放热峰提前；SEM和XRD分析结果显示硅灰填充于SSC之间，使胶凝材料具有良好的级配和密实度，而且与SSC水化产物中少量的Ca（ OH）2产生火山灰效应，提高了试样的强度。

Four different silica fume content （3%, 5%, 8% and 10% respectively） was researched for preparing super sulfate cement （ SSC for short） . The mechanical strength and hydration temperature rise of specimens were tested from mixing to 100h, and the component of hydration products were analyzed by scanning electron microscope and X-ray diffractometer. Then the content differences of silica fume to effect SSC hydration reaction were obtained. Experimental results show that the proper content of silica fume in SSC system is 3% ~5% which has a promoting effect on the mechanical properties and hydration process. The specimens hydration process maximum exothermic peak appear in 30~60h. The advanced exothermic peak occurred went with silica fume incorporation. SEM and XRD analysis showed that the silica fume filled in SSC particles, and cementitious materials with excellent gradation and compaction. Besides, the silica fume reacted with the small amount of Ca（ OH） 2 in the SSC system to cause volcano ash effect, which enhanced the strength of specimens.