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Impact of Microcrack Healing Techniques on Resilient behavior of Asphalt Concrete

Saad Issa Sarsam, Husham Mohammed Al Tuwayyij

Abstract


Concentrated efforts on the development of innovative materials and techniques for asphalt pavement repair are going on, many of them related to crack healing. Flexible pavement usually practices repeated loading and environmental impacts and suffers distresses throughout its service life. Microcracks initiates and can heal itself under controlled conditions. In this 

Concentrated efforts on thedevelopment of innovative materials and techniquesfor asphalt pavement repair are going on, many of them related tocrack healing. Flexible pavement usually practices repeated loading and environmental impacts and suffers distresses throughout its service life. Microcracks initiates and can heal itself under controlled conditions. In this investigation, iron filling was implemented as partical replacement of sand to support the healing process while both microwave induction heating and external heating techniques were adopted to control the healing process. Asphalt concrete specimens have been prepared with different percentages of iron filling and corresponding required asphalt content. Specimens were subjected to repeated indirect tensile stresses for 600 and 1200 repetitions. Specimens were allowed to heal using microwave and oven heating techniques. Specimens were subjected to another cycle of stress repetition and the variation in resilient modulus was detetcted before and after healing. The healing performance of asphalt concrete was investigated by observing the recovery of resilient modulus after healing. It was concluded that implementation of iron filling and induction heating exhibits a great impact on stiffening of asphalt concrete as compared with external heating technique.

 

Keywords:Crack healing; Asphalt concrete; Resilient Modulus; induction heating; Iron filling

Cite this Article: Saad Issa Sarsam, Husham Mohammed Al Tuwayyij. Impact of Microcrack Healing Techniques on Resilient behavior of Asphalt Concrete. International Journal of Transportation Engineering and Traffic System. 2020; 6(1): 33–41p.


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