International Journal of Advanced Materials Research
Articles Information
International Journal of Advanced Materials Research, Vol.3, No.2, Mar. 2017, Pub. Date: Aug. 8, 2017
Impact of Moisture Damage on Micro Crack Healing Process of Asphalt Concrete
Pages: 9-16 Views: 127 Downloads: 41
[01] Saad Issa Sarsam, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
[02] Hanan Kadim Husain, Department of Civil Engineering, College of Engineering, University of Baghdad, Baghdad, Iraq.
Micro cracks healing of asphalt concrete is considered as one of the sustainability measures of asphalt concrete pavement. However, the impact of moisture damage on micro crack healing have not been investigated thoroughly. In this work, Marshall Asphalt concrete specimens of 100 mm diameter and 63 mm height have been prepared in the laboratory. Specimens were divided into three 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 specimens using controlled stress mode of loading for 0.1 second followed by rest period of 0.9 seconds for specified load cycles. Specimens of the third group have practiced moisture damage as per the procedure recommended by super pave system. Specimens of the three groups were then subjected to external heating in an oven at 60°C and allowed to heal for two hours, conditioned at 25°C for two hours, then subjected to another course of repeated tensile or shear stresses. The deformation of the specimens was monitored through continuous video capture. The influence of moisture damage and the impact of asphalt content on the permanent deformation have been analysed as a sustainability measures. It was concluded that the higher deformation could be detected after moisture damage under both of tensile and shear stresses as compared to control mixes after 1000 load repetitions. After micro cracks healing, the permanent deformation decreases by a range of (55-16)% as compared to that after moisture damage under repeated tensile stress as was even lower than that of control mixes. On the other hand it decreases by a range of (18-16) % as compared to that after moisture damage under repeated shear stress.
Moisture Damage, Micro Crack Healing, Shear and Tensile Stresses, Asphalt Concrete, Repeated Loading
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