THE IMPACT OF PARTIAL REPLACEMENT OF COARSE AGGREGATEWITH ELECTRONIC WASTE (E-WASTE) ON THE STRENGTHOFCONCRETE

Electronic waste is an emerging issue posing serious pollution problems to human and the environment. The specific objectives of this work are to determine the physical properties of crushed e-waste materials, granite and aggregates, to design a concrete mix incorporating e-waste and granite as the coarse aggregate, to investigate the strength development of e-waste concrete at 7, 14 and 28 days, under standard curing method, to determine the effect of e-waste replacement on the compressive and flexural strength of concrete, and to analyse the result and ascertain the benefits of e- waste in the production of concrete. The research methodology will involve performing a comprehensive literature reviewand laboratory investigation of compressive strength and flexural test. Before that, several series of test would be carried out which includes specific gravity test, sieve analysis test, mix design, slump test, and casting of concrete test cubes. The results showed that adding e-waste as a partial replacement for coarse aggregate increased workability but reduced strength. Slump values rose from 27mm in the control mix to 61 mm at 20% replacement, indicating greater fluidity due to the smooth, non-absorbent surface of e-waste particles. In contrast, compressive strength dropped from 20.09 N/mm² to 10.43 N/mm², and flexural strength from5.25 N/mm² to 0.38 N/mm² as e-waste content increased. The mix with 5% e-waste achieved 18.12N/mm², close to the control, showing that small replacements maintain acceptable performance. Overall, e-waste improved workability but reduced strength, with 5% replacement identified as the optimum level for structural use. Using e-waste as a partial replacement for coarse aggregate is feasible up to 5%, giving the best compressive and flexural strength. Higher replacements (above 10%) reduce strength significantly. Further studies are recommended under real site conditions, for longer
curing periods, and in combination with other waste materials to improve performance.