Sustainable Concrete Waste Recycling System: Improving the Performance of Concrete Using Low-Quality Recycled Aggregate

This study aims to improve the performance of concrete using low-quality recycled coarse aggregates. For a comparison of recycled coarse aggregate class L (recycled coarse aggregate class L: RLG) and recycled coarse aggregate class M, concrete was produced using the aggregate replacement method, and the study examined the effect of the replacement ratio. Furthermore, a focus on the use of general materials for this study was on the effect of various cements and coarse aggregates used in the mix on concrete performance, in addition to adjusting the replacement ratio of recycled aggregate concrete. The results indicated that the performance of the concrete with RLG can be improved by adjusting the replacement ratio and selecting the type of cement and normal coarse aggregate for use, in addition to general considerations regarding the mix proportion, such as the quantity of water per unit volume of concrete or the water–cement ratio.