Development and evaluation of coalmine waste materials for gainful utilisation

IF 1.3 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Emerging Materials Research Pub Date : 2023-06-01 DOI:10.1680/jemmr.22.00185

S. Choudhury, M. Mishra

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引用次数: 1

Abstract

Coal mine overburden as well as thick inseam parting materials found in the lower Gondwana basin are often 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 composition with coal mine wastes from 50% to 90% and fly ash from 10% to 50% were developed with 2 to 6% cement additives. Their physical, chemical and geotechnical properties were determined. OPC strongly influenced the geotechnical properties. Fly ash presence were optimized for unconfined compressive strength (UCS) and California bearing ratio for both the mine wastes. Composite materials with 70% overburden, 30% fly ash, and 6% cement showed 4.01 MPa UCS at 56 days. Similarly, 80% inseam parting, 20% fly ash, and 6% cement produced 4.90 MPa UCS at 56 days. Analysis of fly ash present in the two composites and their strength values produced linear correlations. Pearson and Spearman’s coefficients produced high correlation of −0.9 for the composite prepared with parting materials. Microstructural analysis showed C-S-H gel formation occurring at 28 days. The composites meet the strength criterion for the base and sub-base of the coal mine haul road.

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煤矿废弃材料的开发与评价

冈瓦纳盆地下部的煤矿覆盖层和厚煤层分裂物常被当作矿山废弃物处理。燃煤电厂未使用的飞灰是另一种废物。本研究的重点是利用这些废物开发更好的复合材料。以50% ~ 90%的煤矸石和10% ~ 50%的粉煤灰为原料，添加2 ~ 6%的水泥添加剂，研制出不同配比的复合材料。测定了它们的物理、化学和岩土力学性质。OPC对土工性能影响较大。对两种废石的无侧限抗压强度和加州承载比进行了粉煤灰掺量优化。覆盖层含量为70%、粉煤灰含量为30%、水泥含量为6%的复合材料在56 d时的UCS为4.01 MPa。同样，80%的接缝分型、20%的粉煤灰和6%的水泥在56天内产生了4.90 MPa的UCS。分析两种复合材料中存在的粉煤灰及其强度值产生了线性相关性。皮尔逊系数和斯皮尔曼系数对分离材料制备的复合材料产生了−0.9的高相关性。显微结构分析显示，28 d时C-S-H凝胶形成。该复合材料符合煤矿运输道路基层和次基层的强度标准。

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来源期刊

Emerging Materials Research MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

9.10%

发文量

期刊介绍： Materials Research is constantly evolving and correlations between process, structure, properties and performance which are application specific require expert understanding at the macro-, micro- and nano-scale. The ability to intelligently manipulate material properties and tailor them for desired applications is of constant interest and challenge within universities, national labs and industry.