Abstract
Crumble rubber (CR) can be used to prepare CR and styrene-butadiene-styrene (SBS) composite modified asphalt with a good high-and low-temperature performance, meanwhile the addition of CR could work as the substitute for SBS and help reduce the content of SBS. This study contains three main parts: effect of preparation and effect of material composition as well as rheological performance characterization. Factors during the preparation, including shearing temperature, shearing time, mixing time and swelling time, were selected, while base binder, CR content, CR particle size and SBS content in material composition were considered. The effects of these factors were assessed in terms of the conventional performance (penetration, softening point, ductility and storage stability). After identifying these effects, the sample of CR and SBS modified asphalt at the selected preparing condition and material composition (CR/SBSMA) was made, and the corresponding SBS modified and CR modified asphalt (SBSMA and CRMA) were produced for the comparing reason. Subsequently, temperature sweeps from 0°C to 80°C were utilized to depict the viscoelasticity of these modified asphalt binders by complex modulus and phase angle. Multiple stress creep recovery tests (MSCR) at 64°C and bending beam rheometer tests (BBR) at various low temperatures were employed to evaluate the high-and low-temperature performance, respectively. Results highlight that that CR/SBSMA could exhibit an excellent high-temperature performance (better than SBSMA), and a good low-temperature performance (reaching the level of base binder).
Highlights
Rheological properties of asphalt binders play an important role in determining the pavement performance and the distresses caused by traffic loading and natural environment [1]
High temperature could help facilitate both swelling of Crumble rubber (CR) and dispersing as well as the critical networks formation of SBS
It should be noticed that extreme high temperature may lead to extra aging on the base binders
Summary
Rheological properties of asphalt binders play an important role in determining the pavement performance and the distresses caused by traffic loading and natural environment [1]. Styrene-butadiene-styrene (SBS) modified asphalt could be the preferred one, mainly due to its overwhelmingly good high-temperature anti-rutting and anti-fatigue performance as well as high strength [8,9,10]. After mixing and shearing with asphalt binder at high temperature, SBS tends to absorb maltene (light components) and swell [3,13]. These swollen SBS particles could contact with each other to form three dimensional networks, when the amount of SBS added in asphalt binders is enough [14]. The usage of SBS modified asphalt is often limited to expressways and other high-level highways in China, due to its high construction costs
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