Fabrication,Properties and Hydration Mechanism of Fluid Solidifying Soil Containing Coal Gasification Slag
LI Dongping1, JIAO Yuanshuo1, ZHANG Kaifan2, ZHAI Yuxin3,*, QIAN Zengzhi3, WANG Changlong1,*, HUANG Tianyong4, ZHENG Yongchao4, BAI Yunyi1, FU Xingshuai1, TIAN Jinglei5, SUN Yujia5
1 Hebei Province Key Laboratory for Low-Carbon Construction and Resilience Enhancement of Construction Engineering, School of Civil Engineering, Hebei University of Engineering, Handan 056038, Hebei, China 2 Jiangxi Provincial Key Laboratory of Safe and Efficient Mining of Rare Metal Resource, School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China 3 China Railway Construction Group Co.,Ltd., Beijing 100040, China 4 State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research, Beijing 100041, China 5 HBIS Group Co., Ltd., Shijiazhuang 050023, China
Abstract: To address the significant issue of solid waste stockpiles between coal chemical and metallurgical industries in China, a curing agent was prepared by using coal gasification slag (CGS), flue gas desulfurization residue, slag, and cement as raw materials. This curing agent, instead of pure cement mixed with clay, was used to produce fluid solidifying soil. The grinding characteristics of CGS, the properties of fluid solidifying soil and the hydration mechanism of the curing agent were investigated by using particle size analysis, mechanical property tests, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results showed that the specific surface area of CGS milled for 50 minutes reached 560 m2/kg and its 28-day activity index reached 65.9%. When the mass ratio of curing agent in CGS,slag,flue gas desulfurization residue,cement was 30∶30∶12∶28, the mass ratio of curing agent, clay was 12∶88, the slurry concentration was 80%, and the dosage of PC polycarboxylate superplasticizer was 1.1%, the 3 day and 28 day compressive strength of the fluid solidifying soil reached 1.64 MPa and 2.31 MPa, respectively; the main hydration products of the curing agent are C-S-H gel, Ca(OH)2, and ettringite (AFt).
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2026, Vol. 40 
