An evaluation of electrically conductive asphalt mixtures for electrically heated flexible pavement systems
M.S. Civil Engineering
Civil and Environmental Engineering
Henry M. Rowan College of Engineering
Yusuf Mehta, Ph.D., P.E.
Committee Member 1
John Schmalzel, Ph.D., P.E.
Committee Member 2
Cheng Zhu, Ph.D., P.E.
Electrical Resistivity, Electrically Conductive Asphalt Mixtures, Graphite-Modified Asphalt Mixtures
Asphalt--Electric properties; Pavements--Performance; Ice prevention and control
The goal of this study is to develop Electrically Conductive Asphalt (ECA) mixtures with optimized electrical and mechanical properties for use in electrically heated asphalt pavements for anti-icing applications. Laboratory experiments were carried out to design ECA mixtures at varying dosages, using three graphite grades of different particle sizes, one virgin aggregate type, two binder grades, and one carbon fiber. The impact of graphite dosage and particle size on the volumetric properties and electrical resistivity of asphalt mixtures was assessed. Different factors with potential impact on the electrical properties were investigated, including the graphite particle size and dosage, the air voids level, the addition of carbon fiber, and binder PG used. Laboratory testing was conducted to evaluate the rutting, cracking, and durability of graphite modified mixtures using the Asphalt Pavement Analyzer, Hamburg Wheel Tracking Device, Semi-Circular Bend, Indirect Tension Cracking Test, and Cantabro loss tests. The results revealed that graphite improves the electrical conductivity of asphalt mixtures when introduced at dosages of 10 to 15% or higher by volume of binder. Graphite-modified mixtures prepared with larger graphite particle sizes, lower air voids, and carbon fibers' addition exhibited improved electrical conductivity than their equivalents. Furthermore, graphite modified mixes had better rutting resistance but higher susceptibility to breakdown and cracking than the unmodified control mix.
Hasan, Rahaf, "An evaluation of electrically conductive asphalt mixtures for electrically heated flexible pavement systems" (2021). Theses and Dissertations. 2913.