A systematic review exploring the utilization of coal mining and processing wastes as secondary aggregate in sub-base and base layers of pavement

• Published in: Construction & building materials Vol. 368; p. 130408
• Main Authors: Mohanty, Monika, Biswal, Dipti Ranjan, Mohapatra, Smruti Sourava
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 03.03.2023
• Subjects: Coal waste; Durability property; Greenhouse gases; Mechanical property; Sustainable pavement; Systematic literature review; Sustainable pavement; Durability property; Coal waste; Greenhouse gases; Mechanical property; Systematic literature review
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2023.130408

•Following a suitable Preferred Reporting Items (PRISMA) framework, Scopus, Web of Science (WoS), and Transport Research International Documentation (TRID) databases were systematically reviewed.•Qualitative analysis of sixty-seven articles published across the globe during 1988-2022 has been carried out to establish the potentiality of coal mining and processing wastes as sub-base and/or base material in pavements.•Physical, chemical, and mechanical properties of untreated coal wastes have been evaluated to establish the efficacy of these waste materials toward sustainable pavement construction.•Opportunities associated with the application of coal mining and processing wastes in the subbase and/or base layer(s) of pavement are extensively debated. With the rising trend in electricity usage, the amount of waste associated with the mining and processing of coal is also rising rapidly. Over the past few decades, improper utilization of these wastes has led to resource depletion, waste disposal, and environmental pollution issues. The key focus of the present study is to review the literature related to the utilization of untreated and treated coal mining and processing wastes in the construction of sustainable roads. Following a suitable Preferred Reporting Items (PRISMA) framework for systematic review, 67 records are considered for the qualitative analysis. The efficiency of these coal mining and processing wastes as secondary aggregate in the sub-base and/or base layer of pavement is reviewed based on their mechanical (California bearing ratio, Unconfined compressive strength, Flexural strength, and Indirect tensile strength) and durability (Freeze-thaw resistance and Resistance to shrinkage) properties. The effectiveness of chemical stabilization on strength gain criteria is also discussed on the basis of microstructural (Scanning electron microscopy and Energy dispersive X-ray spectroscopy) analysis. The findings of the present review suggest that utilization of coal wastes in the construction of bound sub-base and/or base not only addresses the waste disposal challenges but also assists the problems associated with raw material depletion. Additionally, based on the outcomes of past studies, this paper identifies the research gaps and presents future research directions that could open new avenues for the sustainable development of pavement.