Abstract
To obtain the viscoelastic parameters of asphalt mixtures and analyze the effect of temperatures and modifiers on viscoelastic properties of asphalt mixtures, the creep compliances of the neat asphalt mixture (AM), compound diatomite and basalt fibers reinforced asphalt mixture (DBFAM), and styrene-butadiene-styrene modified asphalt mixture (SBSAM) were tested and calculated by the static creep tests. And the creep compliances of the three asphalt mixtures at −20 °C, −10 °C, and 0 °C are deducted by the time–temperature equivalence principle (TTEP) and Arrhenius equation. Further, the relaxation modulus of the three asphalt mixtures from −20 °C to 50 °C at 10 °C increments are calculated by the convolution integral and Simpson method. Subsequently, the Burgers model, the generalized Kelvin model, and the generalized Maxwell model are applied to analyze the viscoelastic properties of the three asphalt mixtures at different temperatures. The results show that the generalized Kelvin model and the generalized Maxwell model are superior to the Burgers model in describing the variation of viscoelastic properties of asphalt mixtures with loading time. At low temperatures, asphalt mixtures have excellent properties in resisting permanent deformation and releasing internal stress. Besides, the addition of SBS modifier and compound diatomite and basalt fibers modifier can significantly raise the viscosity η1 and the elastic modulus E1 of the asphalt mixture, respectively.
Highlights
With the increase of the traffic volume in recent years, neat asphalt mixtures have been difficult to cover all the required specifications in the design of asphalt pavements [1]
Tan et al [3] studied the low-temperature performance of diatomite modified asphalt mixtures by static creep tests, thermal stress restraint tests, and thermal conductivity tests, and the results showed that the low-temperature performance of diatomite modified asphalt mixture is better than that of neat asphalt mixture
Swamy et al [22] investigated the viscoelastic properties of SBS modified asphalt binder using the Burgers model, and the results showed that the addition of SBS could improve the viscoelastic properties of the binder
Summary
With the increase of the traffic volume in recent years, neat asphalt mixtures have been difficult to cover all the required specifications in the design of asphalt pavements [1]. More and more modifiers and reinforced materials are used to improve the performance of neat asphalt mixtures, such as styrene-butadiene-styrene (SBS), diatomite, and basalt fibers. Some researchers have pointed out that the basalt fibers and diatomite reinforced asphalt mixture (DBFAM), as well as SBS modified asphalt mixture (SBSAM), have excellent mechanical properties [2,3,4,5,6,7,8,9,10,11,12]. Zhang et al [2] pointed out that the addition of diatomite significantly decreased the equivalent brittle point of asphalt, diatomite could greatly improve the low-temperature performance of asphalt. Yang et al [5] claimed that the addition of diatomite could improve the
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