Abstract
The use of recycled concrete aggregate (RCA) as a part of coarse aggregates in asphalt pavements confers economic and environmental benefits. Coarse RCA (CRCA) has inferior mechanical and physical properties compared to natural aggregates due to very porous and weakly adhered cement mortar. In this study, CRCA surfaces were coated with waste plastic bottles (WPB) and used at 15%, 30%, and 50% in the asphalt concrete. The Marshall, stiffness modulus, and dynamic creep tests were performed to determine the strength of hot mix asphalts against rutting. The results revealed that the use of untreated CRCA reduced the Marshall quotient and the rutting resistance of the asphalt concrete. The results of the stiffness modulus and dynamic creep tests indicated that CRCA incorporation increased permanent deformation in the tested specimens due to the reduction of asphalt concrete stiffness. However, the asphalt concrete containing treated CRCA had lower permanent deformation because WPB promotes CRCA stability by penetrating its void and reinforcing cement mortar. Furthermore, by raising the temperature, the strength of all asphalt concretes decreased against rutting, and the reduction rate was higher in the modified specimens.
Highlights
Sustainable development in various industries has motivated the use of waste materials in various forms as a substitute for raw materials
Coarse RCA (CRCA) exhibited lower resistance against abrasion compared to natural aggregates, which is mainly attributed to the presence of weak cement mortar on the surface of the waste material
The values of Marshall stability for all the specimens were higher than the minimum value, except for the specimen containing 50% untreated CRCA, and the stability of asphalt concrete increased by using waste plastic bottles (WPB)
Summary
Sustainable development in various industries has motivated the use of waste materials in various forms as a substitute for raw materials. Us, when RCA with physical and mechanical characteristics weaker than those of natural aggregates is utilized in asphalt concrete, the rutting potential of the specimens should be evaluated. E use of CRCA reduced all volumetric characteristics (except for the percentage of air void), stiffness modulus, and rutting resistance compared to the control specimen. (i) Coating CRCA with WPB and investigating its mechanical and physical characteristics (ii) Determining the effect of CRCA with and without WPB on the mix design parameters (iii) Evaluating the rutting resistance of HMAs containing untreated and treated CRCA via different tests (iv) Providing a better understanding of the rutting performance of HMAs containing CRCA by conducting the dynamic creep test at different temperatures
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