Authors: SHAN Hai-chao, HAO Ju-tao, LIU Zeng-hong (Department of Structures and Materials, IWHR, Beijing 100038, China)

Abstract: Two methods of standard test and Jones formula, have been used to study the thermal contraction coefficient of asphalt concrete and asphalt mastic at low temperatures. Results have shown that, during cooling process, the coefficients of asphalt concrete and asphalt mastic decrease gradually. Between -15°C and -35°C, the relationship between the temperature and the thermal contraction coefficient of asphalt concrete is almost linear, Under -35°C, the decreasing trend of the coefficient gradually slows down with temperature, and gradually closes to the thermal contraction coefficient of mineral aggregate. Meanwhile, the thermal contraction coefficients of asphalt concrete and asphalt mastic obtained by standard test and Jones formula differ greatly from each other, which shows that great error may be caused by using Jones formula method to estimate the thermal contraction coefficient of asphalt concrete and asphalt mastic at low temperatures.

Key words: asphalt concrete, asphalt mastic, coefficient of thermal contraction, coefficient of linear expansion

Published in: Journal of China Institute of Water Resources and Hydropower Research, Vol. 9, No. 3, 2011

Article ID: 1672-3031 (2011) 03-0200-05