Mechanical Characteristics and Durability of HMA Made of Recycled Aggregates

Kiran Sapkota, Ehsan Yaghoubi (), P. L. P. Wasantha, Rudi Van Staden and Sam Fragomeni
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Kiran Sapkota: Institute for Sustainability Industries and Liveable Cities, Victoria University, Melbourne, VIC 3011, Australia
Ehsan Yaghoubi: College of Sport, Health & Engineering, Victoria University, Melbourne, VIC 3011, Australia
P. L. P. Wasantha: College of Sport, Health & Engineering, Victoria University, Melbourne, VIC 3011, Australia
Rudi Van Staden: College of Sport, Health & Engineering, Victoria University, Melbourne, VIC 3011, Australia
Sam Fragomeni: College of Sport, Health & Engineering, Victoria University, Melbourne, VIC 3011, Australia

Sustainability, 2023, vol. 15, issue 6, 1-19

Abstract: The application of recycled aggregates in the asphalt industry has been investigated in recent decades. However, low percentages of these materials have practically been used in asphalt mixtures because of the limitations set by the relevant specifications due to their performance uncertainties. This research investigates the feasibility of increasing the percentage of recycled aggregates to 100% in hot mix asphalt (HMA). Recycled concrete aggregate (RCA), recycled glass (RG), and reclaimed asphalt pavement (RAP) were used to develop HMAs suitable for roads with light to medium traffic. First, potential mix designs were proposed using an innovative approach considering the industry’s needs. Next, the volumetric properties, tensile strength, moisture sensitivity and resilient modulus response of the mixtures under different temperature conditions were determined and compared. In general, the proposed recycled material HMA exhibited superior mechanical and resilient modulus performances, i.e., 45 to 145% increase in stiffness, and up to 99% higher in Marshall stability. Furthermore, higher tensile strength ratios of the recycled material mixtures indicated a greater resistance to water damage, and hence greater durability. The findings of this research provide evidence-based insights into the increased proportion of recycled materials in the construction of asphalt pavements, thereby promoting sustainable pavement construction materials.

Keywords: green asphalt; recycled aggregates; indirect tensile modulus; moisture sensitivity; sustainable pavements (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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