Document Type



Doctor of Philosophy (PhD)


Civil Engineering

First Advisor's Name

Hesham Ali

First Advisor's Committee Title

Co-committee chair

Second Advisor's Name

Atorod Azizinamini

Second Advisor's Committee Title

Co-committee chair

Third Advisor's Name

Mohammed Hadi

Third Advisor's Committee Title

committee member

Fourth Advisor's Name

Ioannis Zisis

Fourth Advisor's Committee Title

committee member

Fifth Advisor's Name

Nipesh Pradhananga

Fifth Advisor's Committee Title

committee member


pavement, reclaimed asphalt, rejuvenator

Date of Defense



The use of reclaimed asphalt pavement (RAP) in the pavement industry continues to grow as it is an economically and environmentally beneficial proposition. However, a survey conducted by the Federal Highway Administration shows that the average RAP content in the hot mix used in the United States is only 10–20%, even though specifications allow up to 30%. The primary performance drawback of using a high percentage RAP is cracking distresses. This research is an effort to investigate whether basalt fiber and waste vegetable oil (WO) can improve the low and intermediate temperature cracking behavior of a 100% RAP mixture. Bending beam rheometer (BBR) and the indirect tension asphalt cracking (IDEAL-CT) tests were conducted to measure cracking performance at low and intermediate temperatures, respectively. The rutting performance was controlled using an asphalt pavement analyzer (APA). Four control mixtures and 18 types of mixture consisting of two nominal maximum aggregate sizes (NMAS), three different fiber lengths (3, 6, and 12mm), and three fiber content (0.10, 0.30, and 0.60% by the weight of the mixture), were prepared. It was observed that for mixtures containing fiber, the inflection point at the post-peak part of the load-displacement curve at 25°C occurs at 69% percent of the peak load. Also, a novel method to determine mixture thermal cracking using BBR test results was proposed; ΔTc concept, formerly used for binder thermal evaluation, was utilized for mixture thermal characterizations. Results indicate that ΔTc and rutting depth are not significantly affected by fiber length (FL). On the other hand, CTindex was found a function of both fiber content (FC) and FL. Results showed that NMAS-to-FL ratio of approximately 1.6, results in the highest CTindex for all basalt FC. Also, using proper FC and FL, the fatigue and thermal cracking resistance could be improved up to 110 and 136%, respectively. Finally, a performance-based mix design procedure is prepared for designing a 100%RAP mixture containing fiber and rejuvenator.





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