摘要
为了减少水泥的使用,提高固体废弃物的利用率,研究了 3种固废基无机固化剂[SSC固化剂(75％矿粉+20％石膏+5％水泥)、SDG固化剂(60％矿粉+30％电石渣+10％石膏)、CDF固化剂(40％电石渣+30％粉煤灰+30％水泥)]对工程渣土的固化效果及无侧限抗压强度、水稳系数、吸水率、干湿循环等性能的影响.结果表明:固化剂加入后,固化土的最佳含水率增大,最大干密度减小;3种固化剂中,SDG固化强度最高,7、28 d无侧限抗压强度分别达到了 4.96、5.42 MPa;SSC固化效果最差,尤其在早期,7 d无侧限抗压强度仅为2.16 MPa,同时其水稳系数仅为0.727;微观分析表明,SDG固化土相较于SSC及CDF固化土内部水化反应更完全,颗粒间更密实,结构更稳定.
Abstract
In order to reduce the use of cement and improve the utilization of solid waste,the solidifying performances of three solid waste based inorganic stabilizers(SSC with 75％ground slag,20％gypsum and 5％cement,SDG with 60％ground slag,30％car-bide slag and 10％gypsum,CDF with 40％carbide,30％fly ash and 30％cement)were investigated in this paper,mainly including the unconfined compressive strength,water stability coefficient,water absorption rate and resistance to drying-wetting cycles.The re-sults show that the optimum moisture content increases and the maximum dry density decreases with the addition of soil stabilizers.Among the three stabilizers,the SDG-solidified soil owns the highest strength,and the unconfined compressive strength of 7d and 28 d reached 4.96 MPa and 5.42 MPa,respectively.The SSC-solidified soil exhibits a poor solidifying performance,especially in the early stage,the strength of 7 d is only 2.16 MPa,and the coefficient of water stability is only 0.727.The microscopic analysis results show that compared with the SSC-solidified soil and the CDF-solidified soil,the SDG has a high hydration degree and the connection be-tween the particles is more dense,thus,the structure is more stable.
基金项目
国家重点研发计划项目(2022YFC3803405)
中建西部建设科技研发课题(ZJXJ-PT-2022-14)
维普
万方数据