利用钢渣、脱硫石膏和矿渣等固废制备钢渣基胶凝材料(SSCM),并选取力学性能突出的SSCM稳定铁尾矿基层材料(SIBM),测试了SIBM的力学与耐久性能,并分析讨论了SSCM对SIBM补偿收缩机理。结果表明：SSCM最优配比的28 d抗压强度31.5 MPa。当SSCM灰剂量≥ 8%时,SIBM的无侧限抗压强度满足二级公路轻交通设计要求,且干缩性能优于水泥稳定铁尾矿基层材料(CIBM)。水化产物钙矾石(AFt)大量形成与孔结构的改善是SIBM的干缩减少的重要原因。

Steel slag-based cementitious materials (SSCM) were prepared using solid wastes such as steel slag, desulfurization gypsum and blast furnace slag. The stable iron tailings base material (SIBM) with outstanding mechanical properties was selected for the preparation of SSCM. The mechanical and durability properties of SIBM were tested, and the mechanism of SSCM compensating for shrinkage in SIBM was analyzed and discussed. The results indicated that the 28-day compressive strength of the optimal SSCM formulation was 31.5 MPa. When the SSCM ash content is ≥ 8%, the unconfined compressive strength of SIBM meets the design requirements for second-class highway light traffic, and its dry shrinkage is superior to that of cement stabilized iron tailings base material (CIBM).The formation of a large amount of hydration product of ettringite (AFt) and the improvement of pore structure are important reasons for the reduction of dry shrinkage in SIBM.re structure are important reasons for the reduction of dry shrinkage in SIBM.

U414

国家自然科学基金项目（面上项目，重点项目，重大项目）