水泥协同工业固废固化流态土工作性能研究

doi:10.16552/j.cnki.issn1001-1625.2025.0620

摘要/Abstract

摘要： 为实现工程渣土的资源化利用,并解决传统水泥固化材料的高碳排放和固化效果不佳的问题,采用工业固废与水泥组成的复合固化剂对工程渣土进行流态固化处理。对比分析水泥-高炉矿渣(OPC-GGBS)、水泥-磷石膏、水泥-粉煤灰三种复合固化剂的固化效果,优选出工作性能较优的复合固化剂及配合比参数,并进一步结合流动度试验、场发射扫描电子显微镜(FSEM)试验探究了初始含水率、固化剂掺量和水灰比对流态固化土工作性能的影响规律。结果表明:OPC-GGBS流态固化土的力学性能较优,其中OPC与GGBS的合理配合比为m(OPC)∶m(GGBS)=50∶50;配合比对流态固化土早期流动度影响较小;随着初始含水率的提高或固化剂掺量的减少,OPC-GGBS流态固化土的强度显著下降,而流动值呈相反变化趋势;建立了OPC-GGBS流态固化土的强度和流动值随水灰比变化的相关拟合函数,随着水灰比增加,强度呈幂函数形式下降,流动值呈线性上升趋势;FSEM图像分析表明,降低初始含水率或提高固化剂掺量可以提高流态固化土水化硅(铝)酸钙(C-(A)-S-H)等胶凝材料的生成量,并降低孔隙体积。

关键词: 固化土, 工程渣土, 工业固废, 土壤固化剂, 流动值, 无侧限抗压强度

Abstract: In order to achieve the resource utilization of engineering muck and solve the problems of high carbon emission and poor solidification of traditional cement solidified materials, the composite binders composed of industrial solid waste and cement was used to carry out solidifying treatment of engineering muck. Comparative analysis of cement-ground granulated blast furnace slag (OPC-GGBS), cement-phosphogypsum, cement-fly ash three kinds of composite binder curing performance, preferred working performance of the composite binder combinations and proportion parameters, and further combined with the fluidity test, field emission scanning electron microscope (FSEM) test to explore the initial water content, binder content and the water-cement ratio of the influence rule of the workability of the fluid solidified soil. The result shows that: the mechanical properties of OPC-GGBS fluid solidified soil are relatively excellent, with an optimal mass ratio of OPC to GGBS of 50∶50. The effect of binder content on the fluidity of the fluid solidified soil at the early stage of the process is relatively low. With the increase of the initial water content or the decrease of binder content, the strength of the OPC-GGBS fluid solidified soil decreases significantly, while the flow value shows the opposite trend. The correlation fitting functions for the strength and flow value of OPC-GGBS fluid solidified soil with respect to water-cement ratio are established. With increasing water-cement ratio, the strength decreases in a power function trend, while the flow value increases linearly. FSEM image analysis shows that reducing the initial water content or increasing binder content can increase the production of cementitious materials, such as calcium silicate (aluminate) hydrate (C-(A)-S-H), in the fluid solidified soil, and reduce the pore volume.

Key words: solidified soil, engineering muck, industrial solid waste, soil binder, flow value, unconfined compressive strength

中图分类号:

TU43

代恒军, 吴光雄, 李海峰, 周薛, 章荣军. 水泥协同工业固废固化流态土工作性能研究[J]. 硅酸盐通报, 2025, 44(12): 4492-4502.

DAI Hengjun, WU Guangxiong, LI Haifeng, ZHOU Xue, ZHANG Rongjun. Workability of Fluid Soil Solidified with Cement Synergistic Industrial Solid Waste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(12): 4492-4502.

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