The strength and environmental performance of asphalt mixtures with recycled concrete aggregates
Document Type
Article
Publication Date
11-1-2021
Abstract
Recycling of concrete aggregates in asphalt pavement surfacing is a viable solid waste management strategy. This study evaluated the strength and environmental performance of asphalt mixtures containing different proportions of Recycled Concrete Aggregates (RCA) for road pavement surfacing. Laboratory experiments and environmental life cycle assessment were conducted for different asphalt mixtures. The mixture was evaluated based on their stability/Global Warming Potential (GWP), resilient modulus/GWP, and Indirect Tensile Strength (ITS)/GWP ratios. The mixture containing 40% coarse RCA was judged to be the most efficient based on its highest resilient modulus/GWP and ITS/GWP ratios of 108.30 MPa/kg CO2 eq and 11.75 kPa/kg CO2 eq, respectively. These values are about 9% and 4% higher than the control values for the two indicators, respectively. The study recommended 40% partial replacement of granite with RCA in Stone Mastic Asphalt for optimum strength and environmental impact.
Keywords
Global warming potential, Tensile strength, Life cycle assessment, Recycled concrete, Aggregate, Resilient modulus, Stability
Divisions
fac_eng
Funders
Universiti Malaya [Grant No: GPF006A-2019],Tertiary Education Trust Fund (TETFund) Nigeria
Publication Title
Transportation Research Part D: Transport and Environment
Volume
100
Publisher
Pergamon-Elsevier Science Ltd
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND