Research on Rheological Properties by Desulfurized Rubber Powder/SBS Composite-Modified Asphalt and Road Performance of Its Mixture

Abstract

Desulfurized rubber powder and SBS were used as asphalt modifiers to study the rheological properties and performance of desulfurized rubber powder/SBS composite-modified asphalt (DR/SBSCMA). First, the basic performance indicators such as penetration, ductility, softening point, and viscosity were studied. Second, the high-temperature and low-temperature rheological properties of asphalt were evaluated by using a dynamic shear rheometer (DSR) and bending beam rheometer (BBR). Finally, their high-temperature stability, low-temperature crack resistance, and water stability under the gradation of AC-13 and SMA-13 were evaluated. The results show that DR/SBSCMA had great advantages in terms of ductility and softening point, especially the softening point, which reached 90°C. It also demonstrated excellent high-temperature performance and tensile strength, and penetration was slightly lower than that of SBS-modified asphalt. Moreover, after compound modification, high-temperature and low-temperature rheological properties were effectively improved, and DR/SBSCMA adequately met the requirements of PG82-34. In addition, DR/SBSCMA maintained excellent high-temperature stability in both AC-13 and SMA-13 mixtures, coupled with obvious improvements in rutting deformation. Meanwhile, its low-temperature cracking resistance is slightly lower than that of SBS-modified asphalt, but both adequately meet the specification requirements. Ultimately, the water stability of DR/SBSCMA is comparable to that of SBS-modified asphalt, with both reaching more than 90%, proving its excellent water stability.

A Study on the Performance of Asphalt Modified by Desulfurized Waste Rubber/Ethylene Vinyl Acetate Composite with Additives

“…When the modifier can be completely dispersed in the asphalt, the compatibility between the modifier and the asphalt is optimal, and good compatibility and network structure can reduce the phase separation of the modifier and the asphalt, thus improving the storage stability of the asphalt. The DRP and EVA dosages were determined through preliminary experiments and related studies [7,19,20]. In this study, 4% EVA and 20% desulfurized rubber powder asphalt were used as modifiers to prepare compositemodified asphalt.…”

Rheological Properties of Desulfurized Crumb Rubber Modified Warm Mix Asphalt

“…As a kind of waste, waste rubber powder is widely used in asphalt modification. Wanmei et al show that rubber powder could improve the rheological properties of asphalt [1][2][3] . But crumb rubber modified asphalt viscosity and construction work-ability are not good [4] .…”