Advancements in Materials, Vol. 1, Issue 1, Dec  2017, Pages 40-49; DOI: 10.31058/j.am.2017.11004 10.31058/j.am.2017.11004

Impact of Cyclic Micro Crack Healing on Tensile and Shear Behaviour of Asphalt Concrete Mixture

Advancements in Materials, Vol. 1, Issue 1, Dec  2017, Pages 40-49.

DOI: 10.31058/j.am.2017.11004

Saad Issa Sarsam 1*

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

Received: 11 December 2017; Accepted: 24 December 2017; Published: 12 January 2018

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Abstract

Healing of micro cracks in asphalt concrete may be considered as a sustainability measure of flexible pavement. An attempt has been made in this work to investigate the impact of cyclic crack healing process on tensile and shear behaviour. Asphalt concrete specimens of 100 mm diameter and 63 mm height have been prepared in the laboratory using Marshall Compaction procedure at optimum asphalt content and at 0.5% asphalt above and below the optimum. Specimens were divided into two groups. The first group was subjected to repeated indirect tensile stresses, while the second group was subjected to repeated double punch shear stresses, (both at 25 °C) to initiate micro cracks within the specimen’s structure using controlled stress mode of loading for 0.1 second followed by a rest period of 0.9 seconds for specified load cycles. Specimens were then subjected to external heating process in an oven at 60° C and allowed to heal for two hours, conditioned at 25° C for two hours, then subjected to another two successive courses of healing and repeated tensile or shear stresses. The indirect tensile strength and the double punching shear strength test procedures have been implemented to evaluate the resistance of the specimens to shear and tensile stresses after each repeated loading and each healing cycle. The impact of asphalt content, and healing cycles on the strength behaviour have been analysed as a sustainability measures. It was concluded that healing process have reasonably retained (21, 82, and 65) % of the (ITS) and (23, 24, and 44) % of the (PSS) after the crack healing cycle of load repetitions for mixes with (4.4, 4.9, 5.4) % asphalt content respectively. The impact of asphalt content was not significant among the various testing conditions implemented for tensile strength determination, while optimum asphalt content exhibit the best performance among other asphalt percentages at the various testing conditions implemented for shear strength determination.

Keywords

Crack Healing, Shear Strength, Tensile Strength, asphalt Concrete, 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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