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Volume Title: ICASGE2023

DOI: ICASGE-GEO

¹Niranjan Kumar; ²Anil Kumar Sharma ; Anil Kumar Sharma

¹Department of Civil Engineering, National Institute of Technology Patna, Bihar, India

²National Institute of Technology (NIT) Patna, India

Coal is a major source of non-renewable energy in India. Most of the industries depend on coal to meet the country's energy requirements depend on coal to meet the country's energy demand. In many developing countries, coal is being used as the major fuel to operate the thermal power plants. During extraction of coal from the coal mine, refused materials are obtained from the mines may be hazardous or non-hazardous according to their mineral’s compositions. In this study, an attempt has been made to utilize coal mine waste commonly known as overburden (OB) waste as road subgrade material. As a part of the investigation, various laboratory tests like the specific gravity test, grain size distribution analysis, modified proctor test, and unconfined compressive tests and CBR tests were conducted to evaluate the performance. From the grain size distribution curve, it was found that the coal mine waste falls in the category of poorly graded sand. Further, OB waste was mixed different percentages of fly ash to improve the engineering properties. It was found that maximum dry density (MDD) decreased with increase in fly ash content while optimum moisture content (OMC) increased. Addition of cement was proposed to enhance the binding property of the OB waste-fly ash mixtures. Further, unconfined compressive strength (UCS) and CBR test results showed satisfactory results for utilization as subgrade material. Therefore, it can be concluded that coal mine waste such as OB waste can be successfully utilized as subgrade material.

Coal mine waste; Overburden waste; Road subgrade; CBR; UCS

Geotechnical Engineering (GEO)