以粉煤灰、铁尾矿和废石为主要原料制备出全尾砂废石骨料混凝土,其固体废弃物掺量达到90％.用x射线衍射(XRD)、热重-差热分析(TG-DSC)和扫描电镜(SEM)等方法分析了胶凝材料的水化硬化机理和微观结构特征,研究了粉煤灰对胶凝材料的凝结性能、力学性能和水化放热规律的影响.结果表明,在标准养护条件下全尾砂废石骨料混凝土的28 d抗压强度达83.27 MPa的;粉煤灰不仅具有明显的减水作用,还可减缓水化进程,能有效提高胶凝材料的力学性能;在水化过程中,粉煤灰消耗早期水化产物中的Ca(OH)2,促进二次水化反应的进行,从而使混凝土的长期强度稳定增长.
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