Influence of Recycled Coarse Aggregate on Properties of Concrete

Abstract

This study focuses on the influence of recycled coarse aggregate (RCA) on properties of concrete. Five different mixtures of RCA replacement comprising 0, 25, 50, 75 and 100% RCA were used. It was found that workability, saturated bulk density, compressive strength and flexural strength decreases with increase in RCA content in concrete. 100% manually RCA concrete passed the 17 kN/m² compressive strength limit generally acceptable for concrete work of non-high strength requirement without additive. The research, therefore, recommends the use of recycled coarse aggregate concrete for residential and light commercial building projects bearing in mind that low-strength concrete is only appropriate for mild environmental exposures, and interior concrete protected from the elements. This development in recycled concrete technology would help to alleviate our losses through efficient reuse of recovered coarse aggregate from demolished buildings and infrastructure; hence, reducing waste and dung creation and thereby enhancing adequate environmental management.

Keywords: concrete, recycled aggregate, sustainable construction, properties