全尾砂新型胶凝材料的配合比优化

Mix Proportion Optimization of Whole-tailing Cementitious Materials

选取水淬高炉矿渣为主要原料,石灰加脱硫石膏为复合激发剂,添加少量氯化钙制成全尾砂新型胶凝材料,以其完全取代矿山胶结充填中使用的胶结剂水泥。采用设计4因素3水平的正交试验,考察了石灰、脱硫石膏及氯化钙添加量对全尾砂新型胶凝材料充填体强度的影响,获得了制备全尾砂新型胶凝材料充填体28d强度的最佳配合比。结果表明,全尾砂新型胶凝材料充填体在最佳配合比条件下28d的单轴抗压强度为2.944MPa,是相同条件(浓度、胶砂比、龄期)下42.5R水泥胶凝材料充填体强度的7.5倍,可以取代水泥作为全尾砂胶结剂。

For replacing traditional cement, a new type of whole-tailing eementitious materials is designed and pre pared by using water quenching blast furnace slag as main material as well as lime desulphurization gypsum as composite activator and adding calcium chloride. Using the orthogonal design method of 4 factors×3 levels, the optimal mix propor-tion for preparing the whole-tailing backfill body were obtained by studying the effects of following factors, such as lime, desulphurization gypsum and calcium chloride. The results show that the 28d strength of the whole-tailing backfilling body is 2.944MPa using the optimum mix proportion, which is 7.5 times than that of 42.5R cementitious backfilling body under the same condition of concentration, cement-sand ratio and ages. Therefore, the whole-tailing cementitious material can replace cement as the cementation material.