The Dynamic Modulus of Asphalt Mortar and Its Master Curve

Abstract

The asphalt mortar specimens of AC-13 asphalt mixture with removed coarse aggregates are prepared using a static pressing method to study the changes in the dynamic modulus of asphalt mortar with different asphalt contents at different temperatures and to obtain the dynamic moduli with wider frequency and temperature ranges. The dynamic moduli of asphalt mortars with different asphalt contents at different temperatures are measured using a simple performance test. The master curve equation of the dynamic modulus of asphalt mortar is calculated based on the time-temperature equivalence principle. The results show that (1) under the same asphalt content and temperature condition, the dynamic modulus of asphalt mortar increases with the increase in loading frequency, the dynamic modulus of asphalt mortar decreases with the increase in asphalt content, the minimum difference in dynamic moduli with different asphalt-aggregate ratios under the same frequency is 1.28%, and the maximum difference is 23.90%; (2) the dynamic modulus of asphalt mortars decreases as the temperature rises, and the difference in dynamic moduli is small at 5°C and 10°C; and (3) dynamic moduli with wide frequency and temperature ranges can be obtained from the master curve of the dynamic modulus of asphalt mortars.