The largest use of asphalt is in production of Hot Mix Asphalt (HMA), which is primarily used in construction of flexible pavements throughout the world. HMA mixture is an insulator, which means it cannot conduct electricity. Insulation of HMA curtails its application in the field of developing conductive asphalt mixtures, smart material, and indigenous strain sensing capabilities, developing HMA sensors to predict load (weigh-in-motion), damage accumulation, and so forth. It is inevitable to transform HMA into a semiconductor in order to explore its smart characteristics. Nano-reinforced materials hold the potential to redefine traditional materials both in terms of performance and potential applications. Smart HMA, i.e. conductive HMA, is a new area of research and required in-depth study to understand and evaluate interaction of conductive additives with HMA mixture. Dispersing carbon nanofibers (CNF) in HMA mixture made it a smart material as it developed piezoresistive effect. The electromechanical capabilities of carbon fibers i.e. to sense its own strain due to effect of strain on electrical resistivity was used to develop piezoresistive HMA mixtures. This study has initiated exploratory testing and analysis to evaluate the effective piezoresistive response measuring technique of CNF-modified HMA mixture and the piezoresistive effect at different loading frequencies, temperatures, CNF types and asphalt binder types and stress levels. Novel technique to measure resistivity under cycling loading conditions, successful and functional piezoresistive response modeling and thorough evaluation of mechanical properties of the conductive HMA are some of many conclusions of the study.
|Advisor:||Khattak, M. Jamal, Khattab, Ahmed|
|Commitee:||Habib, Emad, Madani, M. R, Sun, Xiaduan|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||DAI-B 78/12(E), Dissertation Abstracts International|
|Subjects:||Engineering, Civil engineering, Transportation|
|Keywords:||Asphalt, Carbon, Conductive, HMA, Nanofiber, Piezoresistive|
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