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

Mujasim Ali Rizvi, Ammad Hassan Khan, Zia ur Rehman, Aasim Inam and Zubair Masoud
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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

Sustainability, 2021, vol. 13, issue 16, 1-21

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.

Keywords: asphalt mixture; resilient modulus; viscoelastic deformation; aggregate (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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