Performance evaluation of construction and demolition debris as substitute for aggregate in hot mix asphalt

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Abstract

The purpose of this research project is to determine the validity and feasibility of using recycled concrete aggregate (RCA) in Hot Mix Asphalt (HMA) and to compare both the volumetric and performance properties of HMA mixtures constructed with (RCA) to conventional HMA mixtures. To achieve this objective, two HMA mixes were selected with one containing only virgin aggregates and the other made with a combination of 80% of virgin aggregate and 20% RCA. Based on the analysis conducted, RCA has rougher surface textures and lesser amount of flat and elongated and more angular shape particles. These characteristics of the RCA created a stronger aggregate skeleton in the aggregate distributions, which in turn increased the VMA and the resistance to permanent deformation in the mixture. RCA mixture had demonstrated greater rutting resistance as compared to the virgin mix. RCA was very sensitive when it was subjected to water damage. Tensile strength ratio (TSR) values were reduced by over 40% on the mixture containing RCA. Further testing and investigation are needed to fully understand the conditions of this reduction. This research showed that the Department of Transportation would achieve significant saving if RCA is used in HMA mixtures.

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APA

Villiers, C., & Leon, J. (2020). Performance evaluation of construction and demolition debris as substitute for aggregate in hot mix asphalt. International Journal of Sustainable Development and Planning, 15(6), 813–818. https://doi.org/10.18280/ijsdp.150603

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