Advancements in Materials, Vol. 3, Issue 2, Oct  2019, Pages 17-29; DOI: 10.31058/j.am.2019.32001 10.31058/j.am.2019.32001

Influence of Microcrack Healing on Deformation of Recycled Asphalt Concrete Binder

, Vol. 3, Issue 2, Oct  2019, Pages 17-29.

DOI: 10.31058/j.am.2019.32001

Saad Issa Sarsam 1* , Rana Khalid Hamdan 1

1 Department of Civil Engineering, University of Baghdad, Baghdad, Iraq

Received: 13 July 2019; Accepted: 30 August 2019; Published: 11 October 2019

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Abstract

Recycling of aged and distressed asphalt concrete pavement could be considered as an acceptable sustainable issue to reserve the pavement properties and extend its service life. In the present investigation, asphalt cement was subjected to aging in the laboratory, then recycled with polyethylene and crumb rubber. Asphalt concrete specimens were prepared using the recycled binder. Specimens were subjected to repeated indirect tensile stresses and repeated punching shear stresses using the pneumatic repeated load system PRLS at 25°C. After 1200 load repetitions, the loading was terminated, and the specimens have practiced microcrack healing by external heating for two hours at 60°C. Specimens were subjected to another loading cycle of 1200 load repetitions under tensile or shear stresses. The deformation of the specimens was monitored through a continuous video capture. It was concluded that the permanent deformation value under repeated punching shear stresses and repeated indirect tensile stresses decreased after healing by (9.5, 42.5 and 78.3) % and (51, 50, and 46.2) % at asphalt content of (4.8, 5.3 and 5.8) % respectively as compared to the case before healing. Permanent deformation decreases by (40.6, 44, and 16.6) % and (14.1, 10.5, and 30) % for (0.5, 1.0, and 1.5) % of crumb rubber content at optimum asphalt content under repeated punching shear and ITS respectively, while the permanent deformation decreases by (42.4, 42.5, and 32.8) % and (2.6, 11.5, and 6.7) % for (0.5, 1.0, and 1.5) % of Polyethylene content at optimum asphalt content under repeated punching shear and ITS respectively.

Keywords

Recycled binder; Healing; Deformation; Shear; Tensile stress; Repeated loading

Copyright

© 2017 by the authors. Licensee International Technology and Science Press Limited. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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