wseas-12215-20261020065447-32fbfc 20261020065447411 wseas/wseas wseas.group@gmail.com WSEAS WSEAS Transactions on Environment and Development 1790-5079 2224-3496 09 05 2025 09 05 2025 22 Zarife Bajraktari Gashi Department of Materials and Metallurgy, University ‘’Isa Boletini’ Mitrovica, St.Ukshin Kovacica, 40 000, Mitrovica, KOSOVO Rabije Berisha Titan Sharrcem, Han i Elezit, KOSOVO Lignite fly ash from the Kosovo B thermal power plant is a major industrial by-product that can be used as a supplementary cementitious material (SCM). Through a comprehensive two-year monitoring program in 2024 and 2025, this paper presents a study of lignite fly ash from the Kosovo B thermal power plant. The study showcases and monitors its chemical traits, mechanical performance and industrial viability. This study, through the use of X-ray fluorescence (XRF) analysis, found that fly ash contains an average of 32.28% SiO2, 9.01% Al2O3, 6.76% Fe2O3, and 32.93% CaO, with a loss on ignition (LOI) of 2.88%. These characteristics are comparable to Class C fly ash according to the classifications of ASTM C618 and EN 450-1. Regarding average compressive strengths, they reached 14.66 MPa at 7 days and 35.14 MPa at 28 days. Statistical analysis revealed variations over the two years; notably, moisture content negatively impacted early strength (r=−0.547), while MgO exhibited a moderate negative correlation with 28-day strength (r=−0.411). These results are consistent with high-calcium fly ashes reported in international studies. 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