钢渣稳定铁尾矿基层材料的强度与干缩性能

Strength and Dry Shrinkage Characteristics of Steel Slag Stabilized Iron Tailings Base Materials

摘要:

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制备了钢渣稳定铁尾矿基层材料（SIBM），测试了SIBM的力学性能和耐久性能，并分析讨论了SSCM对SIBM的补偿收缩机理。结果表明：最优配合比SSCM的28 d抗压强度为31.5 MPa；当SSCM灰剂量w_SSCM≥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），水化产物钙矾石的大量形成与孔结构的改善是SIBM干缩减少的重要原因。

Abstract:

Steel slag-based cementitious materials（SSCM） were prepared using solid wastes such as steel slag， desulfurization gypsum and blast furnace slag. The steel slag stabilized iron tailings base materials（SIBM） were prepared by SSCM with outstanding mechanical properties. 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 indicate that the 28-day compressive strength of SSCM with the optimal mix proportion is 31.5 MPa. When the ash content of SSCM is greater than or equal to 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 great quantity of hydration product ettringite and the improvement of pore structure are important reasons for the reduction of dry shrinkage of SIBM.