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Advances in Materials Science and Engineering
Volume 2013, Article ID 903236, 9 pages
Research Article

Reinforcement of Recycled Foamed Asphalt Using Short Polypropylene Fibers

1Highway Research Division, Korea Institute of Construction Technology, Daehwa-Dong 283, Goyangdae-Ro, Ilsanseo-Gu, Gyeonggi-Do, Goyang-Si 411-712, Republic of Korea
2Department of Civil Engineering, Seoul National University of Technology, 172 Gongneung 2 Dong, Nowon-Gu, Gongneung-Dong, Seoul 139-743, Republic of Korea

Received 23 January 2013; Accepted 25 March 2013

Academic Editor: Md Mainul Islam

Copyright © 2013 Yongjoo Kim and Tae-Soon Park. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents the reinforcing effects of the inclusion of short polypropylene fibers on recycled foamed asphalt (RFA) mixture. Short polypropylene fibers of 10 mm length with a 0.15% by weight mixing ratio of the fiber to the asphalt binder were used. The Marshall stability test, the indirect tensile strength test, the resilient modulus test, and wheel tracking test of the RFA mixtures were conducted. The test results were compared to find out the reinforcing effects of the inclusion of the fiber and the other mixtures, which included the conventional recycled foamed asphalt (RFA) mixtures; the cement reinforced recycled foamed asphalt (CRFA) mixtures; the semihot recycled foamed asphalt (SRFA) mixtures; and recycled hot-mix asphalt (RHMA) mixtures. It is found that the FRFA mixture shows higher Marshall stability than the RFA and SRFA mixtures, higher indirect tensile strength than the RFA mixture, and higher rut resistance than the RFA, SRFA, and RHMA mixtures as seen from the wheel tracking test.