Experimental Apparatuses for the Determination of Pavement Material Thermal Properties

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Experimental Apparatuses for the Determination of Pavement Material Thermal Properties

Sharifi, Naser P. / Sakulich, Aaron / Mallick, Rajib

Degradation due to temperature fluctuation is the predominant deterioration mechanism affecting many asphalt and cementitious pavement systems. Reduced durability, in turn, limits the sustainability of a materials system: maintenance and replacement are almost always energy and resource intensive. As such, accurate quantification of the thermal properties of any given pavement material is necessary to determine durability and evaluate the effectiveness of novel technologies. Two somewhat inexpensive apparatuses have been developed for this purpose. The first, a Guarded Longitudinal Calorimeter (GLC), measures heat flow through a specimen sandwiched between standards of known thermal properties during either heating or cooling; from the measured heat flow data, many useful thermal properties (apparent thermal conductivity, etc.) can be obtained. The second device, a Solar Simulator, measures the temperature at different depths in multiple well-insulated specimens as they are heated or cooled by halogen lamps or cooled air blowers. The theory, construction, and operation of these devices will be detailed, and the results of analyzing pavement materials in each will be discussed.