Laboratory evaluation of recycled waste concrete into asphalt mixtures

Asphalt paving materials are composed of over 95% aggregate by weight. Therefore, the highway engineering and construction industries annually consume large amounts of aggregate, usually obtained from natural sources. The increased demand for natural stone mining has caused the destruction of natural lands and environmental concerns. This study focused on the determination of the engineering characteristics of hot mix asphalt concrete using dacite and recycled concrete as aggregates. Formulations were tested using recycled concrete aggregate (RCA) as a partial or total replacement for dacite, including replacement of coarse aggregate (CA), fine aggregate (FA) and filler. The results showed that the optimum formulation was a mixture of dacite CA and RCA FA. The optimal mix was superior to the other tested mixes in all the evaluated properties, i.e. Marshall Stability, fatigue, permanent deformation and resilient modulus.

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