Effect of Weak Zones on Resilience of Sustainable Surface Course Mixtures of Fresh-Reclaimed Asphalt Pavement

Syed Iqrar Hussain, Ammad Hassan Khan (), Zia ur Rehman, Wasim Abbas, Safeer Abbas, Abdeliazim Mustafa Mohamed, Dina Mohamed Fathi and Mubashir Aziz
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Syed Iqrar Hussain: Department of Transportation Engineering and Management, University of Engineering and Technology, Lahore 54890, Pakistan
Ammad Hassan Khan: Department of Transportation Engineering and Management, University of Engineering and Technology, Lahore 54890, Pakistan
Zia ur Rehman: Department of Transportation Engineering and Management, University of Engineering and Technology, Lahore 54890, Pakistan
Wasim Abbas: Department of Civil Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
Safeer Abbas: Department of Civil Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
Abdeliazim Mustafa Mohamed: Department of Civil Engineering, Prince Sattam Bin Abdul Aziz University, Alkharj 16273, Saudi Arabia
Dina Mohamed Fathi: Department of Structure Engineering and Construction Management, Future University, Cairo 11835, Egypt
Mubashir Aziz: Department of Civil and Environmental Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia

Sustainability, 2022, vol. 14, issue 16, 1-17

Abstract: The use of reclaimed asphalt pavement (RAP) is necessary for sustainable and cost-effective road infrastructure construction. This research investigates the effect of the area of weak zones ( WZ ) on the resilient modulus ( M RT ) of mixtures of fresh asphalt with 20% RAP. Experimentation on fresh asphalt–RAP mixtures comprising Superpave (SP-A, SP-B) and Asphalt Institute (MS-2) gradations with 20/30, 40/50, 60/70 and 80/100 penetration grade binders was carried out. WZ were determined based on the analysis of magnified digital images of asphalt specimens obtained using optical microscopy. This study demonstrates that the 20/30 grade binder caused an increase in the M RT at 25 °C up to 1.8, 2.9 and 9.2 times for a 0.1 s load duration, and 2.4, 3.0 and 9.7 times for a 0.3 s load duration. In contrast, improvement at 40 °C was observed to be up to 1.9, 3.1 and 9.7 times for a 0.1 s load duration, and 1.9, 3.0 and 12.4 times for a 0.3 s load duration in comparison with 40/50, 60/70 and 80/100 grade binders, respectively. Experimental data were validated by factorial analysis. Power trendline equations were also developed between M RT and WZ to explain the effect of gravel particle orientation on the sustainable resilience of surface course mixtures.

Keywords: sustainability; road construction; resilient modulus; reclaimed asphalt pavement; surface course (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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