碱激发-矿物掺和料改性铜渣新型胶凝材料开发及配比优化

Development and proportioning optimization of new cementitious materials of alkali activated mineral admixture modification copper slag

为解决铜渣活性差、利用率低的问题,经过前期探索性实验研究,选择生石灰和活性矿物掺和料,在复合碱性激发剂作用下与铜渣制备一种无水泥熟料的新型改性铜渣胶凝材料,利用正交试验进行配比优化研究。结果表明:在水胶比为0.3,球磨时间为120 min(5.24 m^(2)/g)、碱含量为8%、矿物掺和料(L)为30%、生石灰为8%时,无水泥熟料的改性铜渣胶凝材料3 d、28 d的最优配比的抗压强度分别为57.7、70.7 MPa。通过XRD、SEM的分析显示,铜渣在碱—矿物掺和料的协同作用后,产生大量的无定形凝胶C-S-H,并相互联接形成板状结构填充孔洞,提高了铜渣胶凝材料的力学性能,铜渣利用率得到显著提升。

In order to solve the problems of poor activity and low utilization rate of copper slag,a new cement clinker-free modified copper slag cementitious material was prepared by selecting quicklime,active mineral admixture and copper slag under the action of composite alkaline activator,and its proportion was optimized by orthogonal test.The results show that when the water-binder ratio is 0.3,the ball milling time is 120 min(5.24 m^(2)/g),the alkali content is 8%,the mineral admixture is 30%,and the quicklime is 8%,the 3-day and 28-day compressive strength of cement clinker-free modified copper slag cementitious material is 57.7 MPa and 70.7 MPa,respectively.XRD and SEM analysis show that a large number of amorphous gels C-S-H are produced after the synergistic action of alkali and mineral admixtures,which are interconnected to form a plate-like structure to fill holes,thus improving the mechanical properties of copper slag cementitious materials and significantly improving the utilization ratio of copper slag.