为了推进工业固废资源化,同时有效提高工程弃土的利用率.选用高炉矿渣、钢渣、磷石膏3种常见的工业固废协同水泥,复配聚羧酸减水剂,对工程弃土进行固化处理.通过D-最优混料试验,确定固化剂的最优配合比为高炉矿渣∶钢渣∶磷石膏∶水泥∶聚羧酸=59.9∶5∶20∶15∶0.1,在该配方下固化土的7 d无侧限抗压强度达到了 5 583 kPa.利用X射线衍射(dif-fraction of X-rays,XRD)试验和扫描电镜(scanning electron microscope,SEM)试验对新型固化剂固化土的微观结构进行分析,结果发现固化土中生成大量的丝状物、针状物和絮状物,使孔隙减小,土体结构更加紧密.该研究成果不仅可为工业固废和工程弃土资源化处理提供参考,同时也为工程弃土二次利用提供一定的理论指导,具有较好的工程适用性.
Optimization of Mixture Ration of Industrial Solid Wastes and Cement Synergistic Solidification Engineering Waste Soil
In order to promote the recycling of industrial waste and effectively improve the utilization rate of engineering waste soil,three common industrial solid wastes,such as blast furnace slag,steel slag and phosphogypsum,were combined with cement,and polycarboxylic acid water reducing agent was used to solidify the project abandoned soil.Through D-optimal mixing test,the optimal mixing ratio of the curing agent was determined as:blast furnace slag∶steel slag∶phosphogypsum∶cement∶polycarboxylic acid=59.9∶5∶20∶15∶0.1.Under this formula,the 7 d unconfined compressive strength of the solidified soil reached 5 583 kPa.X-ray diffraction(XRD)and scanning electron microscopy(SEM)tests were used to analyze the microstructure of the soil solidified by the new curing agent.The results show that a large number of filaments,needles and flocculents formed in the solidified soil made the pores smaller and the soil structure more compact.The research results can not only provide reference for the resource treatment of industrial wastes and construction spoil,but also provide certain theoretical guidance for the secondary utilization of engineering waste soil,which has considerable engineering applicability.
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