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Evaluation of Linear Deformation and Unloading Stiffness Characteristics of Asphalt Mixtures Incorporating Various Aggregate Gradations

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  • Mujasim Ali Rizvi

    (Department of Transportation Engineering and Management, University of Engineering and Technology Lahore, Lahore 54890, Pakistan)

  • Ammad Hassan Khan

    (Department of Transportation Engineering and Management, University of Engineering and Technology Lahore, Lahore 54890, Pakistan)

  • Zia ur Rehman

    (Department of Transportation Engineering and Management, University of Engineering and Technology Lahore, Lahore 54890, Pakistan)

  • Aasim Inam

    (HRTC & Design, National Highway Authority of Pakistan, Islamabad 44090, Pakistan)

  • Zubair Masoud

    (Geotechnical Consultant, Lahore 54810, Pakistan)

Abstract

Optimum stiffness and linear deformation in the unloading phase are fundamental properties of asphalt mixtures required for the durability of flexible pavements. In this research, blends of six different aggregate gradations were used for two base course (BC) and four wearing course (WC) asphalt mixtures. Stability and indirect tensile strength of resulting asphalt mixtures were evaluated to relate to viscoelastic unloading deformation and resilient moduli (instantaneous (MRI) and total (MRT)) at 25 °C using a 40/50 binder for 0.1 and 0.3 s load durations. Results indicated that an increase in coarse aggregate proportion from 48 to 70% for BC has shown a 12% and 14% increase in MRT for 0.1 and 0.3 s load durations, respectively, and an increase in coarse aggregate proportion from 41 to 57.5% for WC has caused a 26% and 20% increase in MRI for 0.1 and 0.3 s load durations, respectively. The same coarse aggregate proportions showed an increase in linear viscoelastic deformation at 0.1 s load duration from 54.6 to 68.2% for WC and from 53.0 to 62.7% for BC, whereas for 0.3 s load duration linear viscoelastic deformation increased from 58.1 to 69.1% for WC and 64.3 to 69.2% for BC. The findings of this study will assist in the selection of aggregate gradations to be used in wearing and base course asphalt mixtures for pavement design, construction and maintenance.

Suggested Citation

  • Mujasim Ali Rizvi & Ammad Hassan Khan & Zia ur Rehman & Aasim Inam & Zubair Masoud, 2021. "Evaluation of Linear Deformation and Unloading Stiffness Characteristics of Asphalt Mixtures Incorporating Various Aggregate Gradations," Sustainability, MDPI, vol. 13(16), pages 1-21, August.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:16:p:8865-:d:610664
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    References listed on IDEAS

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    1. Bruno Crisman & Giulio Ossich & Lorenzo De Lorenzi & Paolo Bevilacqua & Roberto Roberti, 2020. "A Laboratory Assessment of the Influence of Crumb Rubber in Hot Mix Asphalt with Recycled Steel Slag," Sustainability, MDPI, vol. 12(19), pages 1-21, September.
    2. Greg White, 2020. "A Synthesis on the Effects of Two Commercial Recycled Plastics on the Properties of Bitumen and Asphalt," Sustainability, MDPI, vol. 12(20), pages 1-20, October.
    3. Seyed Reza Omranian & Meor Othman Hamzah & Georgios Pipintakos & Wim Van den bergh & Cedric Vuye & Mohd Rosli Mohd Hasan, 2020. "Effects of Short-Term Aging on the Compactibility and Volumetric Properties of Asphalt Mixtures Using the Response Surface Method," Sustainability, MDPI, vol. 12(15), pages 1-16, July.
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    1. Muhammad Akhtar Tarar & Ammad Hassan Khan & Zia ur Rehman & Wasim Abbass & Ali Ahmed & Elimam Ali & Mohamed Mahmoud Sayed & Mubashir Aziz, 2022. "Evaluation of Resilience Parameters of Soybean Oil-Modified and Unmodified Warm-Mix Asphalts—A Way Forward towards Sustainable Pavements," Sustainability, MDPI, vol. 14(14), pages 1-13, July.
    2. Syed Iqrar Hussain & Ammad Hassan Khan & Zia ur Rehman & Wasim Abbas & Safeer Abbas & Abdeliazim Mustafa Mohamed & Dina Mohamed Fathi & Mubashir Aziz, 2022. "Effect of Weak Zones on Resilience of Sustainable Surface Course Mixtures of Fresh-Reclaimed Asphalt Pavement," Sustainability, MDPI, vol. 14(16), pages 1-17, August.

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