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Developing countries especially those in Africa, such as Kenya, are facing the challenge of a growing middle class resulting in greater demand for housing facilities. Alternative and affordable building materials are being sought after. The usage of partial replacement of coarse aggregate using expanded polystyrene (EPS) beads in concrete to produce lightweight concrete gives prospective solution to the construction industry.Therefore, there is need to understand how the concrete replaced with EPS beads behaves and whether it meets the stipulated standards. This paper assesses the suitability of using EPS beads as an alternative replacement material for coarse aggregates and its effect on: the compressive and tensile strength, water absorption rate, workability and density of the resulting concrete. The replacement of coarse aggregates by EPS beads was done in the ratios of 0%, 1%, 3% and 6% by weight. The workability increases with the increase in the amount of EPS up with 6% replacement giving the highest slump value. Density reduced with the increase in the amount of EPS beads added to the mix with 6% having the lowest density of 1398kg/m compared to a value of 2547kg/m for the control sample. The water absorption rate increased with the increase in the amount of EPS with 6% replacement having a value of 4.18% compared to 1.40% for the control sample. The compressive strength reduced with increase in EPS but increased per each replacement as the curing period increased. The tensile splitting strength reduced with increase of EPS. The usage of EPS beads as a potential partial replacement material for coarse aggregates was therefore found to be suitable for structural concrete at 15 replacement and masonry blocks for replacement percentage up to 3%.

Experimental Study On Behavior of Lightweight Concrete with Partial Replacement Of Coarse Aggregates With Expanded Polystyrene