Abstract
This study presented the preparation and performance of a kind of high viscosity and elastic recovery asphalt (HVERA) by using some modifiers. The performance of styrene‐butadiene‐styrene (SBS), rock asphalt (RA), crumb rubber (CR), and stabilizing agent (SA) for different modifiers was investigated by conventional binder test. Effects of modifiers on the high‐ and low‐temperature properties of HVERA were investigated. The dynamic viscosity (DV) test, dynamic shear rheometer (DSR), and bending beam rheometer (BBR) analysis indicated that the high‐ and low‐temperature rheological properties of asphalt were improved attribute to the addition of mixture of modifiers. Meanwhile, the short‐term aging and long‐term aging were simulated by rolling thin film oven (RTFO) and pressure aging vessel (PAV) tests. Furthermore, the Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) measurements were conducted for obtaining the mechanism and microstructure distribution of the modified asphalt binders. From the test results in this study, it was evident that the addition of SBS, RA, CR, and SA into a neat asphalt binder could both significantly improve the viscosity of the binder at high temperature and lower the creep stiffness at low temperature, which was beneficial to better both high‐temperature stability and low‐temperature cracking resistance of asphalt pavements. It was proved that the high temperature grade of HVERA could be increased by increasing of RA and a proper percentage of modifiers could be improved by the low temperature grade of HVERA.
Highlights
Asphalt, as an adhesive for mineral aggregates, has been widely used in pavement engineering because of its excellent cohesiveness [1]
In order to evaluate the performance of high viscosity and elastic recovery asphalt (HVERA) for technical improvement, the asphalt binders which add different dosages of crumb rubber (CR), rock asphalt (RA), and stabilizing agent (SA) were used for experimental investigation
High-viscosity and elastic recovery composite modified asphalt samples were prepared by using several modifiers, such as SBS, CR, RA, and SA. e performances were carried on high-viscosity and elastic recovery composite modified asphalt samples. e major conclusions were drawn as follows: (i) Considering the major properties of HVERA asphalt, the proportion of binder #8 (SBS 5%; RA 7.5%; CR 15%; SA 0.3%) is optimal and reasonable for the preparation of HVERA asphalt
Summary
As an adhesive for mineral aggregates, has been widely used in pavement engineering because of its excellent cohesiveness [1] Many damages, such as lowtemperature cracking, fatigue, and high-temperature rutting, occur with the number of vehicles, and traffic loads increase dramatically as well as the extremely atmospheric conditions [2, 3]. E result indicated that the addition of sulfur improved high-temperature performance of modified binders and the susceptibility of vulcanized binder to dynamic shear. Based on the previous studies, this study provided an efficient way in preparing high-viscosity and elastic recovery asphalt (HVERA) by the addition of SBS, CR, rock asphalt (RA), and stabilizing agent (SA) and studying the effect of each modifier on the major physical properties and aging resistance. It is anticipated that the results can provide a composite modification technology for preparing HVERA and give a reference for the solution of pavement distresses
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