碱-磷渣-粉煤灰胶凝材料的性能研究

Performance of alkali-activated phosphor slag-fly ash cementitious material

为充分利用磷渣和粉煤灰两种工业废渣生产高性能胶凝材料，研究了不同磷渣／粉煤灰配合比的碱-磷渣-粉煤灰胶凝材料的性能．结果表明：碱-磷渣-粉煤灰胶凝材料的凝结时间正常，在掺量为0～30％（质量分数）范围内，随着粉煤灰掺量的增加，碱-磷渣-粉煤灰的凝结时间略有延长．与普通硅酸盐水泥相比，碱-磷渣胶凝材料的抗压强度较高而抗折强度相对较低；掺加粉煤灰后碱-磷渣胶凝材料的抗压强度降低，但抗折强度提高．碱-磷渣胶凝材料的抗冻性和耐蚀性均优于普通硅酸盐水泥，但其干缩较大，用部分粉煤灰取代磷渣粉可一定程度减小干缩．

The performance of alkali-activated phosphor slag-fly ash cementitious material with different mix proportions of phosphor slag and fly ash was studied to make full use of phosphor slag and fly ash for preparing a new type of high performance cementitious material. The result shows that the alkali-activated phosphor slag-fly ash cementitious material is of normal setting performance in general, and that the increase of amount of fly ash within the range of mass fraction 0-30% resuhs in a little increase of the setting time of the cementitious material. As compared with ordinary portland cement, alkali-phosphor slag cementitious material is characterized by high compressive strength but low flexural strength. Adding fly ash into alkali-phosphor slag cementitious material will reduce the compressive strength of the material, but its flexural strength will be improved. In addition, the frost-resistance property and the corrosion-resistance property of alkali-phosphor slag cementitious material are both superior to those of ordinary portland cement, but the dry shrinkage of this kind of the cementitious material is relatively large; however, the substituting fly ash for part of phosphor slag can reduce the dry shrinkage to some extent.