Abstract—Over 50 million tons of solid waste, primarily from hard coal mines are generated in Poland annually. This type of waste, called Coal Mine Wastes (CMWs), can be found across the country due to mining activities. CMWs triggers several environmental problems such as groundwater contamination, primarily characterized by heightened chloride salinity, acid generation, and sulfur content. The main objective of this study is to examine the possibility to substitute natural aggregates in concrete with CMWs. Characterization of coal-mining waste physicochemical properties and assessment of short-term and longterm structural concrete behaviors such as compressive strength, splitting tensile strength, bulk density, water absorption, and porosity were considered. Mechanical results show an obvious decline of concrete fabricated with CMWGs, a substitution of 10% natural sand and 30% natural coarse aggregate proves sufficient to elaborate C40/50 concrete. Moreover, the incorporation of coal waste negatively impacts the density and the porosity of concrete.

Keywords—coal mine waste aggregates, concrete, mechanical properties, recycling, circular economic, untreated waste coal aggregates

Cite: O. Aboutaybi and B. Yang, "Impact of Coal Mine Waste Aggregates (CMWGs) as a Mixing Component on Mechanical Properties of Concrete," International Journal of Structural and Civil Engineering Research, Vol. 13, No. 4, pp. 126-131, 2024.