International Journal of Materials Chemistry and Physics
Articles Information
International Journal of Materials Chemistry and Physics, Vol.5, No.1, Mar. 2019, Pub. Date: Mar. 5, 2019
Assessing the Rejuvenate Requirements for Asphalt Concrete Recycling
Pages: 1-12 Views: 1362 Downloads: 592
[01] Saad Issa Sarsam, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
[02] Mostafa Shaker Mahdi, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
Recycling of aged asphalt concrete pavement is considered as one of the major requirements for sustainability. It can reserve the aggregate and binder resources. An attempt has been made in this investigation to prepare a suitable rejuvenator in the laboratory for recycling of an aged pavement. Two types of additives namely carbon black and styrene-butadiene-rubber (SBR) have been implemented and each one was mixed with asphalt cement to form the rejuvenator. Three percentages of additives (0.5, 1, and 1.5)% by weight of asphalt cement and two percentages of asphalt cement (1 and 2)% have been implemented as rejuvenator and mixed with the aged asphalt concrete. Recycled Asphalt concrete specimens were prepared and tested using the Marshall compaction. It was concluded that highest Marshal stability was achieved when 1.5% of carbon black or SBR were added with 1% of asphalt cement. The addition of 2% asphalt cement with carbon black or SBR exhibits higher flow value than that of 1% asphalt binder with additives. SBR additive exhibits higher voids content, VMA, and higher percentage of voids filled with asphalt as compared to carbon black regardless of the asphalt content. Indirect tensile strength ITS decreases by (34 and 43)%. Temperature susceptibility decreases by (50 and 86)%, while the punching shear strength decreases by (21 and 41)%. The resistance to moisture damage increases by (109 and 121)% after recycling with carbon black- asphalt and SBR-Asphalt rejuvenators respectively.
Recycling, Rejuvenate, Durability, Moisture Damage, SBR, Carbon Black
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