硅酸盐学报

将钢渣粉磨后分级,得到7种不同粒径的试样,用X射线衍射仪分析了它们的矿物成分,研究了粗粒子试样在硅酸钠作用下的胶凝性,并以矿渣为参比样,比较研究了钢渣细粉与矿渣易磨性及胶凝性的差异,用扫描电子显微镜及X射线能谱仪分析了钢渣中硅酸盐矿物硅酸三钙(C3S)和硅酸二钙(C2S)的固溶组分。结果表明:钢渣中难磨组分为铁铝酸钙[Ca2(Al,Fe)2O5]和镁铁相固溶体(MgO·2FeO),且它的水化反应活性很低;钢渣中C3S和C2S具有较好的易磨性,其易磨性比矿渣的略好,但其水化反应活性明显比矿渣的差,钢渣中的C3S和C2S固溶了较多的异离子;钢渣水化活性低是由于它所含的矿物Ca2(Al,Fe)2O5,MgO·2FeO无水硬性,C2S呈γ型,水硬性低,而C3S是在长时间高温下形成的,它具有较稳定的结构,其水化活性亦相对较低。

Steel slag was ground,then graded by sieve to seven samples with different particle sizes.Their mineral components were determined by X-ray diffraction analysis,and the cementitious performance of coarse particle samples in silicate sodium solution was studied.The grindability and cementitious performance of fine powder of steel slag were compared with high blast furnace slag,and solid solution component in silicate phases(C3S and C2S) of steel slag was determined by scanning electron microscopy with energy dispersive X-ray diffraction analysis.The results show that Ca2(Al,Fe)2O5 and MgO·2FeO have the worst grindability of all minerals in the slag,and they have little hydrating activity.However,the grindability of C3S and C2S was slightly better in steel slag than in high blast furnace slag,but the hydrating activity of the C3S and C2S is markedly lower than in high blast furnace slag.The results also show that a great amount of cation exists in C3S and C2S.It is pointed out that the inherence of low hydrating activity of steel slag is that Ca2(Al,Fe)2O5,MgO·2FeO and γ-C2S have little activity,and C3S is formed at high temperature and after a long time;thus,it also has low activity.