石膏与硅灰对钢渣水泥基胶凝材料复合改性效应  

Compound Effect of Dihydrate Gypsum and Silica Fume on Strength of Steel Slag-Cement Binding Materials

作　　者：杜君[1,2] 刘家祥[1,2] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室 [2]材料科学与工程学院,北京100029

出　　处：《土木建筑与环境工程》2013年第3期131-136,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(51174011)

摘　　要：以钢渣和水泥为主要原料,加入少量石膏(CaSO4.2H2O)与硅灰,制备钢渣水泥基胶凝材料。探讨了CaSO4.2H2O与硅灰掺量对钢渣水泥基胶凝材料强度的影响,并通过XRD、SEM表征,研究钢渣水泥基胶凝材料的水化性能。结果表明:复掺1%CaSO4.2H2O和4%硅灰的钢渣水泥基胶凝材料3d抗压强度较未掺CaSO4.2H2O与硅灰提高了59.0%,28d抗压强度提高了32.4%;CaSO4.2H2O与硅灰的加入不会影响钢渣水泥基胶凝材料水化产物种类;相同龄期内,加入CaSO4.2H2O与硅灰的钢渣水泥基胶凝材料中水化硅酸钙(C-S-H)凝胶和钙矾石(AFt)含量增多,Ca(OH)2晶体含量、晶体尺寸有所减小。By adding small amount of dihydrate gypsum （CaSO4·2H2O） and silica fume in steel slag-cement system, steel slag-cement binding materials were prepared. And the dosage of CaSO4·2H2O and silica fume on the properties of steel slag-cement binding materials was studied. Hydration properties and paste structure were investigated by SEM and XRD. The results show that both CaSO4·2H2O and silica fume can improve the strength of steel slag-cement binding materials. Compared with single-doped, compound of CaSO4·2H2O and silica fume has much better effect on strength of steel slag-cement binding materials. The optimum proportion of CaSO4·2H2O and silica fume are 1% and 4%, respectively. The 3 d compressive strength is increased by 59.0N, and the 28 d compressive strength is increased by 36.5%. No matter adding CaSO4·2H2O and silica fume or not, the steel slag-cement binding materials have the same hydration products. However, the content of C-S-H gel and AFt crystals is higher, and the content of Ca （OH）2 crystals is lower in steel slag-cement binding materials containing CaSO4·2H2O and silica fume than those in steel slag-cement bindintz materials without CaSO4·2H2O and silica fume.

关 键 词：钢渣 钢渣胶凝材料 石膏 硅灰 水化反应 

分 类 号：TU528[建筑科学—建筑技术科学]