Laboratory study on recycled concrete aggregate based asphalt mixtures for sustainable flexible pavement surfacing

• Main Authors: Nwakaire, Chidozie Maduabuchukwu, Yap, Soon Poh, Yuen, Choon Wah, Onn, Chiu Chuen, Koting, Suhana, Babalghaith, Ali Mohammed
• Format: Article
• Published: Elsevier 2020
• Subjects: TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.um.edu.my/25507/; https://doi.org/10.1016/j.jclepro.2020.121462
• Institution: Universiti Malaya

Utilisation of recycled concrete aggregates (RCA) for highway pavement construction has been a sustainable attempt towards conservation of the natural resource base as well as mitigation against the environmental problems associated with harmful solid waste disposal. The performances of asphalt mixtures with 20%, 40%, 60%, 80% and 100% of coarse granite as well as 100% of coarse and fine granite replaced by RCA, for flexible pavement surfacing, have been evaluated in this paper. The mixture containing 100% granite was used as control. Marshal stability, flow, volumetric properties, resilient modulus, indirect tensile strength, moisture susceptibility, fatigue resistance, rutting resistance, impact strength, skid resistance, and abrasion resistance were tested for the mixes. With respect to resilient modulus and indirect tensile strength tests, the control mixture performed better than the RCA mixtures but the RCA mixtures generally performed better than the control in the other tests. The control recorded 9496 MPa and 1058 kPa for resilient modulus and indirect tensile strength respectively. These were comparable to the mix with 40% RCA with 9339 MPa and 1051.7 kPa resilient modulus and indirect tensile strength, respectively. It was concluded that RCA can be effectively utilised in asphalt mixtures but 40% RCA replacement is recommended for optimal pavement performance. © 2020 Elsevier Ltd