Abstract: The thermal properties of asphalt concrete panel materials for hydraulic structures are important factors affecting the temperature field of the panel that has a sealing layer of asphalt mastic as its outermost coating. To develop a temperature field model, it is necessary to obtain the parameters of the properties accurately. This paper presents an experimental study of the thermal properties of the impervious layer, leveling layer asphalt concrete, and cushion layer concrete, using the transient plane source method and a DRE-III multifunctional rapid thermal conductivity tester. We focus on analysis of the asphalt mastic layer, involving its thermal conductivity, thermal diffusion coefficient, and specific heat capacity, under different asphalt types, different oil to powder ratios, and different aging degrees. Then we discuss the mechanism of different influencing factors on these three thermal parameters. The results show significant differences occur in the three parameters among different types of asphalt-made mastics; Thermal conductivity and thermal diffusivity are correlated negatively with the oil to powder ratio, while specific heat capacity is correlated positively; Aging has relatively small influence on these properties, causing a change of less than 5% in all the parameters.

Key words: hydraulic asphalt mastic, transient plane source method, anti-seepage panel, thermal property parameter, degree of aging