为了实现砒砂岩的资源化利用,首先,通过碱激发法并掺入适量的矿粉将砒砂岩转变成了力学性能较好的改性矿粉/砒砂岩复合材料;然后,系统地研究了矿粉、碱激发剂掺量和龄期对改性矿粉/砒砂岩复合材料抗压强度和软化系数的影响;最后,利用SEM/EDS、FTIR和XRD分析了改性矿粉/砒砂岩复合材料的水化进程和碳化进程.结果表明:改性矿粉/砒砂岩复合材料的90 d抗压强度和软化系数分别达到46.0 MPa和0.94,完全满足工程应用的需求;改性矿粉/砒砂岩复合材料主要的水化产物为C-S-H凝胶和地聚物胶体,且C-S-H凝胶存在比较严重的碳化现象;当矿粉和NaOH的掺量分别为20.0wt％和1.5wt％时,C S H凝胶的28 d碳化率达30.1％,且碳化率随矿粉及NaOH掺量的增加而减小,但碳化率对强度几乎没有影响.改性矿粉/砒砂岩复合材料拥有良好的力学性能及耐水性.
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