Thermal Properties of Asphalt Mixtures

Juliana Byzyka, Mujib Rahman, Denis Chamberlain

Research output: Chapter in Book/Published conference outputConference publication


In this paper, the thermal properties of three dense graded asphalt mixtures, 20 mm DBM, AC 14, and AC 3 6, are presented. Density and air voids of the compacted specimens are also shown. Thermal conductivity 4 was measured in the laboratory for non-aged, short-term aged and long-term aged asphalt mixtures at three different temperatures 19 (±1) o C, 65 (±5) o C, and 80 (±5) o 5 C. Specific heat capacity and thermal 6 diffusivity were calculated from equations derived from the literature. Heat penetration depth was also 7 calculated and shows the heat from the thermal conductivity instrument heat source that dissipates into 8 the asphalt specimens. The results were analyzed to determine the effect of air voids content, transient 9-line source (TLS) method, temperature and aggregate size in thermal conductivity and the effect of aging 10 on the thermal properties of the asphalt mixtures studied. It was concluded that there is a minimal effect 11 in thermal conductivity for 4% to 6.5% air voids. The method of measurement and temperature affect 12 considerably thermal conductivity. However, the results were inconclusive in the effect of aggregate size 13 on thermal conductivity. The effect of asphalt aging in thermal conductivity and thermal diffusivity varied 14 between the asphalt mixtures studied and was relative to the temperature. Asphalt aging did not affect 15 specific heat capacity.
Original languageEnglish
Title of host publicationTransportation Research Board (TRB) Annual Meeting 2021
Subtitle of host publication1222 - Evaluation, performance and durability of asphalt mixtures
Place of PublicationWashington DC, USA
Number of pages18
Publication statusAccepted/In press - 21 Jan 2021
EventTransportation Research Board 100th Annual Meeting - Virtual
Duration: 21 Jan 202129 Jan 2021


ConferenceTransportation Research Board 100th Annual Meeting


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