Self-monitoring Application of Asphalt Concrete Containing Graphite and Carbon Fibers

• Published in: Journal of Wuhan University of Technology. Materials science edition Vol. 23; no. 2; pp. 268 - 271
• Main Authors: Liu, Xiaoming, Wu, Shaopeng, Li, Ning, Gao, Bo
• Format: Journal Article
• Language: English
• Published: Heidelberg Wuhan University of Technology 01.04.2008; Springer Nature B.V; School of Civil Engineering and Architecture, Central South University, Changsha 410075, China%Key Laboratory of Silicate Materials Science and Engineering of Ministry of Education, Wuhan University of Technology, Wuhan 430070, China
• Subjects: Asphalt; Carbon fibers; Chemistry and Materials Science; Materials Science; 压电电阻率; 沥青混凝土; 碳纤维; 自监测; asphalt concrete; carbon fibers; graphite; piezoresistivity; self-monitoring
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-006-2268-2

The self-monitoring application of asphalt concrete containing graphite and carbon fibers using indirect tensile test and wheel rolling test were introduced. The experiment results indicate that this kind of pitch-based composite is effective for strain/stress self-monitoring. In the indirect tensile test, for a completely conductive asphalt concrete specimen, the piezoresistivity was very weak and slightly positive, which meant the resistivity increase with the increment of tensile strain at all stress/strain amplitudes, with the gage factor as high as 6. The strain self-sensing ability was superior in the case of higher graphite content. However, when the conductive concrete was embedded into common asphalt concrete specimen as a partial structure function, the piezoresistivity was positive at all stress/strain amplitudes and with the gage factor of 13, which was much higher than that of completely conductive specimen. Thus, the strain self-sensing ability was superior when conductive asphalt concrete was taken in as a partial structure function. In the wheel-rolling test, the piezoresistivity was highly positive. At any stress amplitude, the piezoresistivity was strong, with the gage factor as high as 100, which was higher for a stress amplitude of 0.7 MPa than that of 0.5 MPa.