Microscopic and dynamic rheological characteristics of crumb rubber modified asphalt

Abstract

A test for crumb rubber modified asphalt containing 20% crumb rubber particles (30 mesh) was performed using a scanning electron microscope (SEM). The experimental results indicate that the crumb rubber particles are evenly distributed in the asphalt. Shear rate sweep and shear-temperature sweep tests on the crumb rubber modified asphalt at -20-80 ℃ using a dynamic shear rheology (DSR) instrument, were carried out. The tests show that the complex modulus decreases with increasing temperature; at equivalent temperature, higher load frequencies lead to a larger complex modulus, and this value increasingly decreases as the temperature increases; the phase angle increases with temperature and decreases as the load frequency increases. It can be concluded that the rutting resistance limiting temperature of crumb rubber modified asphalt is 78 , and the anti ℃ -fatigue limiting temperature is 16 ℃, which shows that the asphalt has preferable rutting resistance characteristics at high temperature, as well as anti-fatigue characteristics. In addition, the complex modulus master curve at different temperatures was plotted according to the time temperature equivalence principle, which allows the study of the dynamic state behavior of crumb rubber modified asphalt at a wide range of load frequency.

Synthesis of silane‐grafted ethylene vinyl acetate copolymer and its application to compatibilize the blend of ethylene‐propylene‐diene copolymer and silicone rubber

“…For higher load frequencies, the contact time of the sample and load is shorter, the deformation of the blend is smaller, so the complex modulus increase. However, the time under loading increases at low frequencies and the deformation of the blend increases, leading to a decreased complex modulus . Besides, it can be noticed that values of G * of the compatibilized blends are all lower than that of the uncompatibilized blend.…”

Microstructure and rheological properties of aged and unaged polymer-modified asphalt binders

“…The solvent method was used in the test samples preparation (Wang, Xing, & Chang, 2010), which involved heating the asphalt binder to a molten state while stirring well, placing a few drops of the molten asphalt onto a glass slide, letting the drops cool to room temperature, and then scrubbing them in one direction using a piece of silk soaked in trichloroethylene. Finally, the sample was made ready for microscopy by wiping off the trichloroethylene, and scrubbing the slide surface two or three times until only tiny particles remained on the surface.…”

Crumb Rubber Modified Asphalt: Fundamentals to Recent Developments

“…Beyond the limit of this linear region, the shear modulus reduces by almost 95% compared to its value at zero strain [33]. Crumb rubber particles, when Crumb Rubber Modified Asphalt: Fundamentals to Recent Developments DOI: http://dx.doi.org/10.5772/intechopen.1004314 distributed evenly in asphalt result in significant resistance towards deformation, especially to high-temperature rutting and low-temperature cracking [34]. It has been observed that the low-temperature elasticity of bitumen is enhanced in the addition of crumb rubber, but loss tangent at high temperatures may decrease resulting in lower high-temperature elasticity [35].…”