Evaluation of the Factors Affecting the Performance of Fiber-Reinforced Asphalt Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 2
Abstract
This paper summarizes the results of the first comprehensive laboratory study that was conducted to evaluate the effect of using different aramid fiber properties (types, lengths, and dosages) with different combinations on the performance of dense-graded asphalt mixtures reinforced with aramid fibers. Asphalt mixtures with two different aramid fibers (Fiber A and Fiber B) were prepared. For each type of fiber, two lengths and four doses were considered. The semicircular bend (SCB) test, indirect tensile asphalt cracking (IDEAL-CT) test, and the overlay tester (OT) were conducted to evaluate fracture resistance and reflection cracking resistance of prepared mixtures, along with the asphalt concrete cracking device (ACCD) test for evaluating the low-temperature cracking resistance, the Hamburg wheel-tracking (HWT) test for evaluation of rutting susceptibility. Cost analysis was also done to evaluate the feasibility of adding aramid fibers to the asphalt mixtures. Results of the conducted tests indicated that the effects of adding aramid fibers to asphalt mixtures vary depending on the type of aramid fiber and its properties. In general, the addition of the Type A and Type B aramid fibers to the unmodified performance grade (PG) 64-22 mixtures resulted increasing their fatigue lives by 104% and 65%, respectively. Adding Type B fiber [short aramid/polyolefin fiber blend with 12.5 mm (0.75-in.) length] or long Type A fiber (wax-treated aramid fiber with a length of 1.5 in.) to the PG 64-22 mixtures resulted in improving the cracking resistance of reinforced mixtures. In addition, doubling the suppliers’ recommended dosage of each fiber type resulted in significantly lower cracking resistance values. The fibers did not improve the resistance to low-temperature cracking for asphalt mixtures. However, the rutting and moisture susceptibility results for fiber-reinforced mixtures were satisfactory compared with the unreinforced mixtures. Results of cost analysis indicated that the addition of aramid fibers to the mixtures resulted in a significant reduction of construction cost for these mixtures to the values between 27% and 37%. The optimum formulation of both aramid fibers for the purpose of improving cracking resistance of asphalt mixtures was found as 1.5-in. length at the supplier recommended dosage for Type A aramid fiber, and 0.75-in. length and the supplier recommended dosage for Type B aramid fiber.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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© 2022 American Society of Civil Engineers.
History
Received: Jan 29, 2022
Accepted: May 31, 2022
Published online: Dec 5, 2022
Published in print: Feb 1, 2023
Discussion open until: May 5, 2023
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