Abstract
To study the variation in the high-temperature stability of asphalt mixtures under extreme high temperature and heavy load, rut tests and analyses were carried out with both the APA (asphalt pavement analyzer) test and CLWT (Chinese wheel load test). In this paper, the relationship model between the dynamic stability of asphalt mixtures and the temperature, load, and binder viscosity is established; this model provides a method for evaluating the temperature stability of asphalt mixtures under nonstandard temperature conditions. The results revealed that the dynamic viscosity of an SBS-modified asphalt binder showed an exponential relationship with temperatures varying from 55°C to 70°C. Under a temperature condition from 55°C to 70°C and a pressure of 0.7 MPa, the dynamic stability of the asphalt mixture increased linearly with increasing temperature. The dynamic stability of the asphalt mixture exhibited a temperature inflection point at 65°C, and the decay rate was increased. The APA test results, which were used to evaluate the anti-rutting performance of the asphalt mixture on the basis of the ratio of the rutting depth difference to action times from 6000 to 8000, showed a good correlation with the CLWT test results. With a high temperature of 65°C and the pressure increasing from 0.7 MPa to 1.3 MPa, the dynamic stability of the asphalt mixture exhibited exponential decay. The variation laws of dynamic stability with temperature, load, and asphalt binder viscosity were revealed by complex logarithmic variation.
Highlights
Rutting influences the appearance and smoothness of the pavement of a road surface and causes discomfort and potential safety hazards to road users; these problems are mainly the results of deformations in asphalt mixtures under high temperatures and heavy traffic loads
It has been shown that the rutting depth increased by approximately 1.8 times when the temperature was increased by 5°C from 40°C to 60°C, and the rutting depth increased by roughly the same multiple as the axle load [2]
It was indicated that 65°C was the temperature inflection point of the dynamic stability of the asphalt mixture
Summary
Rutting influences the appearance and smoothness of the pavement of a road surface and causes discomfort and potential safety hazards to road users; these problems are mainly the results of deformations in asphalt mixtures under high temperatures and heavy traffic loads. Pramesti utilized a four-point bending test to predict fatigue cracking of GAC and developed a new calibration factor to describe the fatigue life of GAC mixtures [10, 11] Based on this method, Zhang Yongsheng suggested that the index for evaluating the high-temperature performance and performance under heavy loads of GAC used in the Wu Shen Expressway in Guangdong Province should be reconsidered [12]. To evaluate the deformation resistance of modified asphalt mixture under high temperature and heavy load, Ji and others carried out the triaxial repeated load test on two asphalt mixtures under multi-temperature (50°C, 60°C, and 70°C) and multi-load (0.7, 0.8, 0.9, and 1.0 MPa) conditions and proposed two indices, the flow number and nonlinear fitting index, which had negative and positive correlation with temperature and load, respectively [16]. The fitting results of DS were confirmed based on the temperature, traffic loads, and viscosity of modified asphalt used in GAC mixtures
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