Abstract
In order to study the evolution law of mechanical properties of asphalt pavement mixture in cold regions under long-term load, the rotary accelerated loading equipment was used to carry out a total of 500,000 accelerated loading tests on the full-scale pavement, and the dynamic modulus test of the mixture before and after wheel load was carried out respectively. The master curve of dynamic modulus and dynamic modulus ratio (dynamic modulus value after wheel load / dynamic modulus value before wheel load) of the mixture at -20ºC were established to predict the long-term mechanical response of the mixture at low temperature. The results show that: low-frequency (or high temperature) has a more significant effect on the viscoelastic properties of the asphalt mixture. In the conversion frequency range of 1.6×10–3~1.6×102 Hz, the dynamic modulus ratio decreases with the increase of frequency, and the maximum ratio is 0.62 when the frequency is 1.6×10–3 Hz, which indicates that the high frequency (low temperature) has little effect on the performance of asphalt mixture. This study can be used as a theoretical reference for the structural design and performance optimization of asphalt pavement in cold regions.
Highlights
Accelerated loading equipment can be used to simulate the damage of road surface quickly caused by actual traffic load in several years, and its full-scale accelerated loading test is the most effective and accurate way to realize the fatigue process of asphalt pavement
Yu Lei and et al[13] analyzed the influence of bitumen-aggregate ratio on the high temperature stability of rubber asphalt mixture by establishing the master curve of rubber asphalt mixture with different bitumen-aggregate ratio
(2) Sample after wheel loading: after the accelerated loading test of full-scale test road based on cold area is completed, core samples are drilled in the loading area of test road
Summary
Accelerated loading equipment can be used to simulate the damage of road surface quickly caused by actual traffic load in several years, and its full-scale accelerated loading test is the most effective and accurate way to realize the fatigue process of asphalt pavement. The equipment can simulate the actual stress state of pavement more truly, evaluate the fatigue damage of pavement correctly, and test the dynamic modulus of asphalt mixture under long-term load with corresponding test means. There are few studies on the dynamic modulus of asphalt mixture under accelerated loading, so it is necessary to further study
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