Effect of Freezing-Thawing and Ageing on Thermal Characteristics and Mechanical Properties of Conductive Asphalt Concrete

Conductive asphalt concrete with graphite can improve the workability of asphalt solar collector (ASC), which provides an interesting method to mitigate a series of realistic problems related to asphalt pavement. The freezing-thawing cycles and ageing of asphalt material are recognized as critical factors that could affect the durability of asphalt pavement. In this paper, the influences of freezing-thawing and ageing on mechanical properties and thermal characteristics of conductive asphalt concrete (CAC) were experimentally investigated. Control asphalt concrete samples were prepared by the same aggregate gradation and volume composition with CAC. The thermal properties of asphalt concrete were studied by Thermal Constants Analyzer. Experimental results indicated that freezing-thawing effect would lead to volume expansion and strength degradation of CAC samples. During the freezing-thawing test, the thermal conductivity and specific heat of CAC tend to decrease while the thermal diffusivity increased correspondingly. Although ageing process would degrade the moisture resistance, low temperature and fatigue properties of conductive asphalt concrete, there was no significant differences in thermal conductivity, thermal diffusivity and specific heat between the original and aged samples. Compared to control asphalt concrete, the incorporation of graphite improved the anti-ageing properties of conductive asphalt concrete.

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  • English

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  • Accession Number: 01684962
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 3 2018 3:25PM