Identifier

etd-11142016-144138

Degree

Master of Science in Civil Engineering (MSCE)

Department

Civil and Environmental Engineering

Document Type

Thesis

Abstract

Healing by means of induction heating is promising, however the effectiveness of this technology is yet to be demonstrated due to limited studies on cracking damage and fracture resistance property recoveries after healing. The objective of this study was to test the hypothesis that a new generation of asphaltic materials could be artificially healed while in-service by embedding metallic fibers in the mix and by applying a magnetic field at the surface. To achieve this objective, an open-graded friction course (OGFC) was successfully designed and prepared to incorporate up to 5% steel and aluminum fibers by weight of the mix. Based on results of the study, it was found that the control mix and the mix prepared with aluminum fibers exhibited a greater ultimate load at failure prior to healing, than those specimens with steel fibers. Yet, differences were not statistically significant. The induction heating experiment was conducted successfully and showed the feasibility of inducing Eddy current in the metallic fibers without contact to the specimens. After healing, the control mix displayed the highest ultimate load after healing, although unsuccessfully heated through Eddy current; yet neither were these differences statistically significant. These outcomes indicate that other healing mechanisms were present due to the recovery period, which allowed the control specimens to heal during the rest period. Healing efficiency showed the highest results for the control specimen that approached 85%. The healing efficiency for the specimen with aluminum and steel fibers was 72 and 62%, respectively. Microscopic image analysis demonstrated that induced cracks healed efficiently during the healing period. Additionally, Loaded Wheel Track (LWT) test was conducted to analyze the rutting performance of the asphalt mixtures with steel and aluminum fibers. The results indicated that the mixture with a high percentage of steel fibers (5.0%) performed better than the ones with less content, while the mixtures with aluminum fibers did not perform well.

Date

2016

Document Availability at the Time of Submission

Release the entire work immediately for access worldwide.

Committee Chair

Mostafa, Elseifi

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