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Abstract

In order to study the confining stress dependence of dynamic mechanical properties of asphalt mixtures, triaxial dynamic modulus tests were carried out on AC-20 (AH‑30#) and AC-25 (AH‑30#) asphalt mixtures at different test temperatures, different scanning frequencies, and different confining pressure levels. Firstly, the effects of confining stress on the dynamic mechanical properties of asphalt mixtures at different temperatures and frequencies were analyzed. Secondly, based on the time–temperature equivalent principle, Boltzmann and Gussamp function models were used to draw the principal curves of dynamic modulus and phase angle of asphalt mixtures with a reference frequency of 10 Hz, respectively. The results show that the confining pressure has little effect on the dynamic mechanical properties of the two asphalt mixtures at different scanning frequencies when the test temperature is lower than 20 °C. When the temperature is 55 °C, and the scanning frequency is 0.1 Hz, the maximum dynamic modulus ratio of AC-20 (AH‑30#) and AC-25 (AH‑30#) asphalt mixtures is 3.50 and 2.49, respectively. When the test temperature is 50 °C, and the scanning frequency is 0.1 Hz, the minimum phase angle ratio is 0.59 and 0.65, respectively. At high temperatures, a larger confining pressure level means a larger dynamic modulus ratio and a smaller phase angle ratio. The dynamic mechanical properties of the two asphalt mixtures have a significant confining stress dependence. The dynamic modulus of asphalt mixtures and the principal curve as a whole have the same change trend, but in the high temperature region, the confining pressure level increases; the dynamic modulus increases, and the phase angle decreases. The confining pressure stress plays a hardening effect on the asphalt mixture, and there are significant differences in the principal curve. In this case, the asphalt mixture should be regarded as a nonlinear viscoelastic material. It is suggested to introduce confining pressure into the dynamic modulus test of asphalt mixtures and explore a new triaxial dynamic modulus test method to replace the existing uniaxial compression dynamic modulus test for asphalt mixtures.

Publication Date

11-24-2023

DOI

10.14048/j.issn.1671-2579.2023.05.042

First Page

248

Last Page

253

Submission Date

March 2025

Reference

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