粉煤灰
水泥
抗压强度
煤矿开采
硅酸盐水泥
覆盖层
底基层
水合硅酸钙
煤
材料科学
环境科学
废物管理
岩土工程
复合材料
地质学
工程类
数学
离散数学
一般拓扑结构
拓扑空间
扩展拓扑
作者
Subhasrita Choudhury,Manoj Kumar Mishra
出处
期刊:Emerging Materials Research
[Thomas Telford Ltd.]
日期:2023-06-01
卷期号:12 (2): 112-125
被引量:1
标识
DOI:10.1680/jemmr.22.00185
摘要
Coal mine overburden and thick inseam parting materials found in the lower Gondwana basin are treated as mine wastes. Unused fly ash from coal-fired plants is another waste material. This investigation focused on using these wastes to develop better composite materials. Composite materials of varying compositions with coal mine wastes from 50 to 90% and fly ash from 10 to 50% with 2–6% cement additives were developed and evaluated. Their physical, chemical and geotechnical properties were determined. Ordinary Portland cement strongly influenced the geotechnical parameters. The fly ash content was optimized for unconfined compressive strength (UCS) and California bearing ratio for both mine wastes. Composite materials with 70% overburden, 30% fly ash and 6% cement showed a UCS of 4.01 MPa at 56 days. Composites with 80% inseam parting, 20% fly ash and 6% cement produced 4.90 MPa UCS at 56 days. Linear correlations were observed between fly ash percentage in the two composites and their UCS values. Pearson’s and Spearman’s coefficients produced a high correlation of −0.9 for the composite prepared with parting material. Microstructural analysis showed calcium silicate hydrate gel formation occurring at 28 days. The composites meet the strength criterion for the base and subbase of coal mine haul roads.
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