利用湿法生产机制砂尾泥制备流态固化土试验研究  

Study on the Experimental Preparation of Flowable Solidified Soil Using Tailings from Wet-process Manufactured Sand Production

作　　者：吉俊豪 宋少民 李劭 彭天 李金君 杜若萱 赵晓娇 JI Junhao;SONG Shaomin;LI Shao;PENG Tian;LI Jinjun;DU Ruoxuan;ZHAO Xiaojiao(Beijing University of Civil Engineering and Architecture,Beijing Key Laboratory of Building Structure and Environmental Remediation Functional Materials,Beijing 100044)

机构地区：[1]北京建筑大学,建筑结构与环境修复功能材料北京市重点实验室,北京100044

出　　处：《粉煤灰综合利用》2025年第2期18-24,共7页Fly Ash Comprehensive Utilization

摘　　要：采用水泥固化剂和固废基胶凝材料固化剂分别固化尾泥制备流态固化土,通过流动扩展度、凝结时间、泌水率、流变性能和无侧限抗压强度试验,探讨水固比、灰土比、激发剂掺量和砂土比对尾泥流态固化土的工作性能和力学性能的影响。结果表明:水固比为0.62~0.69,掺量为7%~11%水泥固化剂或15%~17%GC固化剂,制备尾泥流态固化土28 d抗压强度在0.56~2.10 MPa,满足一般性非结构回填工程;水固比为0.62,激发剂掺量20%,掺入再生细骨料优化颗粒级配并控制砂土比为0.3时,GC固化剂流态固化土流动扩展度为265 mm,28 d抗压强度达到2.66 MPa,泌水率低于3%,可满足早强型结构性回填工程;拌合浆体黏度小于0.88 Pa·s,流态固化土拌合物泌水率较大;提出机制砂洗砂尾泥的流态固化土制备中可控的参数和胶凝材料掺量。研究成果可为湿法机制砂尾泥再利用提供参考。Fluidized solidified soil was prepared by stabilizing tailings sludge using cement curing agents and solid waste-based cementitious curing agents,respectively.The effects of water-solid ratio,binder-soil ratio,activator dosage,and sand-soil ratio on the workability and mechanical properties of the fluidized solidified tailings sludge were investigated through experiments on flow spread,setting time,bleeding rate,rheological properties,and unconfined compressive strength.The results indicate that:With a water-solid ratio of 0.62-0.69 and a dosage of 7%-11%cement curing agent or 15%-17%GC curing agent,the 28 days strength of the fluidized solidified tailings sludge ranges from 0.56 to 2.10 MPa,meeting the requirements for general non-structural backfill engineering.For GC-cured fluidized soil optimized with a water-solid ratio of 0.62,20%activator dosage,and controlled sand-soil ratio of 0.3(incorporating recycled fine aggregates to improve particle gradation),the flow spread reaches 265 mm,the 28 days strength attains 2.66 MPa,and the bleeding rate remains below 3%,fulfilling the criteria for early-strength structural backfill applications.When the viscosity of the mixed slurry is less than 0.88 Pa·s,the fluidized solidified soil mixture exhibits a higher probability of bleeding.Propose the controllable parameters and cementitious material dosage in the preparation of fluidized stabilized soil using manufactured sand washing tailings.The research findings can provide references for the reuse of wet-process manufactured sand tailings.

关 键 词：机制砂尾泥 流态固化土 固废基胶凝材料 流变性能 水固比 

分 类 号：TU528[建筑科学—建筑技术科学]