n Journal of Emerging Trends in Engineering and Applied Sciences - Use of recycled concrete aggregates in structural concrete in Mauritius

Volume 6, Issue 1
  • ISSN : 2141-7016
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In the face of a possible scarcity of natural aggregates in the future in Mauritius and in line with sustainable construction, this research investigates the feasibility of the use of recycled coarse concrete aggregate of 5-20 mm fraction as an alternative to natural coarse aggregates in structural concrete. The recycled coarse concrete aggregate used in the research was processed from waste concrete at a major local concrete batching plant. Three pairs of grade 40 concrete mix each consisting of a control mix and a test mix, were batched. The percentage of recycled concrete coarse aggregates by weight of all in aggregates in the test mixes were 15%, 25% and 35% respectively. The properties of both natural and recycled coarse aggregates and the fresh and hardened properties of both control and trial concrete mixes were investigated. The results showed that the recycled coarse concrete aggregates had poor mechanical and physical properties but the chemical contents were within limits. Compressive and flexural strengths as well as modulus of elasticity were lowered with an increase in recycle aggregate content. The recycled coarse aggregates (RCA) had little influence on the hardened density of concrete and an increase in recycled aggregate content led to a decrease in bleeding capacity. The main drawback of the RCA was the high permeability of the recycled aggregate concrete. The research concludes that the use of RCA in structural concrete is not technically feasible in Mauritius since the most desired concrete properties such as strength and durability are affected. However, since the properties of RCA vary highly among sources, results of this research must not be taken as absolutes. It is recommended that more testing need to be carried out to make sure the conclusions that have been drawn in this paper are applicable.

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