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实验选取了Ⅰ级和Ⅱ级两种粉煤灰,以石灰和脱硫石膏为激发剂制备的胶凝材料完全取代传统的胶结剂水泥,以胶砂比为1∶4,水胶比为1∶1左右制备的粉煤灰全尾砂充填料在45±1℃下养护3 d,强度可达5.432 MPa,在20±1℃下养护28 d强度可达3～7 MPa,满足一般矿山对充填料的要求.根据料浆质量分数和坍落度关系曲线,得到了该材料制备成的可泵送膏体质量分数范围为80.5%～83.0%.通过X射线衍射和扫描电镜分析,胶凝材料的水化产物主要为凝胶类物质、钙矾石和方解石.
Two types of fly ash, grade I and grade II, were selected in the experiment. The cementitious material prepared by using lime and gypsum as the stimulating agent completely replaced the traditional cement with the ratio of cement to sand of 1: 4 and the water-cement ratio of 1: 1 fly ash tailings filler at 45 ± 1 ℃ for 3 days, the strength of up to 5.432 MPa, at 20 ± 1 ℃ curing 28 d strength up to 3 ~ 7 MPa, to meet the general mine on the filling According to the curve of slurry mass fraction and slump, the mass fraction of pumpable paste prepared from this material ranged from 80.5% to 83.0% .According to X-ray diffraction and scanning electron microscopy, The hydration products are mainly gels, ettringite and calcite.