Laboratory Characterization of Low-Temperature Performance of High Modulus Asphalt Concrete by Beam Bending Test

Abstract

Low-temperature cracking is a serious distress of asphalt pavement which cannot be ignored in cold climates. In this study, the low-temperature performance of high modulus asphalt concrete is characterized through low-temperature beam bending test. According to the analysis of low-temperature cracking mechanism and test results in this paper, the critical value of strain energy density is a reasonable index to evaluate the low-temperature performance which combines the critical bending strength and strain. Results also show that the dosage of high modulus additives has a significant influence on the low-temperature performance of asphalt concrete. Road engineers should keep a balance between the high-temperature performance and low-temperature performance of high modulus asphalt concrete, especially in some cold regions.