Use of fine recycled concrete aggregates in asphalt mixtures -

Abstract

Currently, environmental protection and sustainability have become basic concerns around the world. Many industries, one of which is construction, have set initiatives towards more environmental friendly practices. Lebanon, the scope of this study, is facing a crisis when it comes to construction and demolition waste management and disposal. These wastes are produced either from emergencies as wars and earthquakes or from the development of cities and increase in population. Therefore, viewing construction demolition waste as a resource rather than waste is essential, basically as a construction material where considerable amount can be used in roadway construction activities. The main objective of this research is to evaluate using fine recycled concrete aggregates (RCA) into hot mix asphalt (HMA). The work scope consists of conducting fundamental material property tests for the RCA and the natural aggregates used, conducting mix designs using Marshall mix design and Superpave mix design for a control mix consisting of natural limestone aggregates only and mixes where 10percent, 15percent, 20percent, 30percent, and 45percent of the fine aggregates are replaced with fine RCA. In addition, the effect of recycled aggregates filler will be studied on the mastic level. Analysis of testing results for Marshall Stability, dynamic modulus, mastic complex modulus, and non-recoverable creep compliance reveal acceptable results for incorporating fine recycled concrete aggregates in HMA up to 20-30percent.