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Abstract

Potential challenges are facing the construction industry as results of the environmental issues caused by its activities. The use of recycled coarse aggregate (RCA) and recycled-steel fibers (RSF) in the production of concrete can be employed to mitigate the impact of these issues. In this experimental research, the performance of recycled-aggregate concrete (RAC) containing recycled coarse-aggregate (RCA) and recycled steel fibers (RSF) is studied. This study examines the workability and mechanical properties of RAC where the natural-coarse aggregate (NCA) is totally replaced with RCA. The effect of replacing the cement with 15% of Metakaolin (MK) and the addition of 12 kg.m−3, 24 kg.m−3 and 36 kg.m-3of RSF on the mechanical related properties of RAC is assessed. Five concrete mixtures containing RCA (one without MK, one with MK but without RSF and three with MK and RSF) were examined. One more mix (reference mix) was made with NCA for comparison reasons. It was concluded that RCA reduces the workability by 23% and the strength characteristics such as (compressive, flexural and splitting tensile strength) of concrete by 29%, 19% and 17%, respectively. Also, it was found that MK and RSF diminish the workability of the RAC. But, MK and RSF can help compensate the loss of strength properties due to the use of RCA.