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Microstructure and fracture morphology of carbon nano-fiber modified asphalt and hot mix asphalt mixtures |
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| Authors: | Mohammad J Khattak Ahmed Khattab Pengfei Zhang Hashim R Rizvi Thomas Pesacreta |
| Affiliation: | 1. Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA, USA 2. Department of Industrial Technology, University of Louisiana at Lafayette, Lafayette, LA, USA 3. Department of Mechanical Engineering, University of Louisiana at Lafayette, Lafayette, LA, USA 4. Department of Biology, University of Louisiana at Lafayette, Lafayette, LA, USA 5. Diretor Microscopy Center, University of Louisiana at Lafayette, Lafayette, LA, USA |
| Abstract: | This paper focuses on the microstructure and fracture surface morphology of neat and carbon nanofibers (CNF) modified asphalts and hot mix asphalt (HMA) mixtures using scanning electron microscopy (SEM). Asphalt binder was modified with 1.5 % of CNF by weight of binder. The modified asphalt was used to construct HMA mixtures at various CNF dosages, mixed with aggregate, using the Superpave Gyratory compactor. Small rectangular specimens extracted from the center of large HMA samples were tested under direct tension and the fracture surface was examined under SEM. The SEM analysis developed a fundamental understanding of the role that the CNF modification plays in the performance enhancement of asphalt and HMA mixtures. It was found that CNF not only possess good adhesion characteristics but also exhibits high connectivity and were evenly distribution throughout the binder. The fracture surface morphology also revealed that CNF exhibited crack bridging at micro/nano scale which may enhance the resistance to cracking due to repeated traffic loads. |
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