Thermal Properties and Transient Temperature Response of Full-Depth Asphalt Pavements

Autor:	Donath Mrawira, Joseph Luca
Rok vydání:	2002
Předmět:	Materials science Moisture business.industry Mechanical Engineering Compaction Thermodynamics Thermal diffusivity Asphalt concrete Thermal conductivity Heat transfer Thermal Composite material business Saturation (magnetic) Civil and Structural Engineering
Zdroj:	Transportation Research Record: Journal of the Transportation Research Board. 1809:160-171
ISSN:	2169-4052 0361-1981
DOI:	10.3141/1809-18
Popis:	An improved laboratory test procedure for measuring thermal conductivity of asphalt concrete (AC) pavement is proposed. In this preliminary work, a simple device for thermal diffusivity of AC is developed and the corresponding thermophysical properties are measured. The measurement results indicate that the thermal conductivity and thermal diffusivity of AC are functions of compaction degree, degree of moisture saturation, and temperature. From the estimated thermal conductivity and the measured thermal diffusivity, the transient temperature response to changes in environmental conditions of an AC pavement is analyzed numerically with an incremental recursive method by applying the energy balance principle and the Fourier heat transfer equation. The analysis results show that an AC pavement undergoes diurnal temperature cycles whose amplitude decreases with depth and changes sharply at the pavement surface. In addition, with the changing frequency of the temperature, thawing and refreezing effects of the AC pavement increase progressively from January to March in New Brunswick, Canada.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::50ea192103d422a80edf5da564579806 https://doi.org/10.3141/1809-18 Zobrazit plný text záznamu