Abstract
In this paper, AMPT is used to study the dynamic modulus of different types of rubber asphalt mixtures in the laboratory, based on the viscoelastic theory, in order to determine the actual dynamic modulus of different structural layers under the action of temperature field in the asphalt pavement. Based on the time-temperature equivalence principle and Sigmund model, the dynamic modulus main curve is established. The actual dynamic modulus of asphalt concrete at each pavement layer is calculated by referring to the test data of pavement temperature field in Shijiazhuang and Tangshan. The data show that the dynamic modulus of asphalt mixture is significantly affected by temperature and loading frequency. Due to the influence of temperature field, the dynamic modulus of concrete in different structural layers will change dynamically. Under the effect of temperature field in winter, the minimum value of actual dynamic modulus of pavement is 1~2 times of the design value. Under the action of temperature field in summer, the maximum dynamic modulus of pavement structure layer is 62~72% of the design value. This study not only provides the basis for dynamic modulus selection in asphalt pavement design, but also has certain reference value for improving the life of asphalt pavement.
Highlights
Waste tire rubber powder modified asphalt solves the environmental pollution of solid waste, and realizes the reuse of waste resources
The results showed that the Witczak model based on viscosity underestimates the dynamic modulus, and the modified Witczak model based on viscosity had a higher accuracy in determining the dynamic modulus
The results showed that the NCHRP 1-37A model generally underestimates the dynamic modulus of hot mixed asphalt. (HMA) mixtures, but provides better adhesion quality for foaming WMA mixtures
Summary
Waste tire rubber powder modified asphalt solves the environmental pollution of solid waste, and realizes the reuse of waste resources. The dynamic modulus is expressed as the test temperature and is loaded as a function of the frequency and volume parameters of the mixture. Based on the above-mentioned documents, people have realized the influencing factors of the dynamic modulus of asphalt mixture, and carried out the dynamic modulus prediction model; the temperature field is an important factor affecting the damage of the asphalt pavement, and numerical simulations have been carried out. In this paper, based on viscoelastic theory and asphalt mixture performance test (AMPT) method, the relationship between dynamic modulus of rubber asphalt mixture and temperature and loading frequency was determined by indoor AMPT test, and the main dynamic modulus curve was established. Based on the viscoelastic theory, the AMPT applied the load to the specimen in the form of input alternating stress It can measure the mechanical behavior of concrete under different temperature and frequency and simulate the dynamic load response of asphalt pavement. The range of axial deformation of the specimen is 85–135 με
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