Mechanical Properties and Mineral Characteristics of Multi-Source Coal-Based Solid Waste Filling Materials under Different Proportioning

被引:0
|
作者
Huang, Guodong [1 ,2 ,3 ,4 ,5 ]
Zheng, Xiaojun [2 ]
Gao, Miao [3 ]
Chen, Qi [3 ]
Qiao, Zheng [3 ]
Xie, Tianbao [3 ]
Deng, Mengyao [3 ]
Wei, Qing [3 ]
机构
[1] Anhui Univ Sci & Technol, Sch Civil Engn & Construct, Huainan 232001, Peoples R China
[2] China Construct Second Engn Bur Co Ltd, Beijing 100160, Peoples R China
[3] Hefei Comprehens Natl Sci Ctr, Inst Energy, Hefei 230031, Peoples R China
[4] East China Univ Technol, Engn Res Ctr Geol Environm & Underground Space Jia, Nanchang 330013, Peoples R China
[5] Anhui Univ Sci & Technol, Inst Environm Friendly Mat & Occupat Hlth, Wuhu 241003, Peoples R China
关键词
grouting material; desulfurization gypsum; fly ash; cement hydration; compressive strength; GAS DESULFURIZATION GYPSUM; FLY-ASH; CEMENT; BINDER; SLAG;
D O I
10.3390/cryst13070997
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Traditional grouting materials have certain limitations, such as greater cement consumption, high cost, slow setting rate, and insufficient early strength, hindering their wide applicability. In this paper, desulfurization gypsum (DG) and fly ash (FA) are used as the main raw materials, supplemented by a small amount of Portland cement (PC), to develop a low-cost, fast-setting, and high-early-strength filling material. The mechanical properties and setting characteristics were assessed for varying PC, DG, and FA ratios. The effects of different mineral crystal formations on mechanical properties and hydration characteristics were analyzed. The results show that adding DG leads to a sudden decrease in mechanical properties while accelerating the setting. The compressive strength and setting rate increase with increasing DG content. FA can assist in PC hydration and delay the setting time, and the dosage should be limited to 20%. A synergistic enhancement effect between DG and FA can be achieved, forming grossular-type aluminosilicate and promoting compressive strength development. The optimal performance is achieved when PC, DG, and FA are added at 20%, 60%, and 20% dosages, respectively.
引用
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页数:13
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