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Effect of calcium chloride on the properties of gangue cemented paste backfill: Experimental results of setting time, rheological properties, mechanical strength and microscopic properties

文献类型：期刊论文

作者Zhao, Bingchao2,3; Wen, Jie3; Zhai, Di3; Tang, Renlong2,3; Chen, Shangyinggang3; Xin, Jie1
刊名CASE STUDIES IN CONSTRUCTION MATERIALS
出版日期2025-07-01
卷号22页码:16
关键词Backfill Setting time Calcium chloride Microscopic characteristics Mechanism
ISSN号2214-5095
DOI10.1016/j.cscm.2025.e04331
英文摘要In order to solve the problem of pipe blocking caused by the retention of backfill slurry in the pipeline after intermittent backfill during the long distance transportation and intermittent space backfill, the setting time of gangue cemented paste backfill (GCPB) slurry needs to be optimized. Here, the effects of calcium chloride (CaCl2) dosages on the setting time, rheological properties and mechanical properties of GCPB were studied, the corresponding key parameters were analyzed, and the recommended optimal dosage of calcium chloride (CaCl2) was determined. The changes of hydration rate, hydration products and micro-morphology of GCPB under different calcium chloride (CaCl2) dosages were recorded by heat of hydration test, thermogravimetricderivative & thermogravimetry (TGD-TG) test, scanning electron microscopy (SEM) test and Xray diffraction (XRD) test. The reaction mechanism of CaCl2 modified gangue cemented paste backfill was discussed. The results showed that the effect of calcium chloride (CaCl2) on the setting time of GCPB was divided into two categories: the initial setting time of the GCPB slurry can be prolonged by the content of 0.1 %-0.7 %, and be shortened by the content of 0.8 %-5 %. The optimal dosages range of calcium chloride (CaCl2) was determined to be 0.3 %-0.5 % to meet the requirements of long-distance pipeline transportation. Finally, the microstructure reaction mechanism of the GCPB was analyzed. The research results provide reference for the improvement of mine backfill.
资助项目National Natural Science Foundation of China[52074208] ; Two Chains' Integration Key Projects-Joint Key Projects of Enterprise Institutes-Industrial Field Program[2023-LL-QY-02] ; Natural Science Basic Research Program of Shaanxi[2023-JC-QN-0399]
WOS研究方向Construction & Building Technology ; Engineering ; Materials Science
语种英语
WOS记录号WOS:001427194000001
出版者ELSEVIER
源URL[http://119.78.100.198/handle/2S6PX9GI/37119]  
专题中科院武汉岩土力学所
通讯作者Zhai, Di
作者单位1.Chinese Acad Sci, Inst Rock & Soil Mech, China State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
2.Minist Educ China, Key Lab Western Mines & Hazards Prevent, Xian 710054, Peoples R China
3.Xian Univ Sci & Technol, Energy Sch, Xian 710054, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Bingchao,Wen, Jie,Zhai, Di,et al. Effect of calcium chloride on the properties of gangue cemented paste backfill: Experimental results of setting time, rheological properties, mechanical strength and microscopic properties[J]. CASE STUDIES IN CONSTRUCTION MATERIALS,2025,22:16.
APA Zhao, Bingchao,Wen, Jie,Zhai, Di,Tang, Renlong,Chen, Shangyinggang,&Xin, Jie.(2025).Effect of calcium chloride on the properties of gangue cemented paste backfill: Experimental results of setting time, rheological properties, mechanical strength and microscopic properties.CASE STUDIES IN CONSTRUCTION MATERIALS,22,16.
MLA Zhao, Bingchao,et al."Effect of calcium chloride on the properties of gangue cemented paste backfill: Experimental results of setting time, rheological properties, mechanical strength and microscopic properties".CASE STUDIES IN CONSTRUCTION MATERIALS 22(2025):16.

入库方式： OAI收割

来源：武汉岩土力学研究所

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