Rheological Studies of Asphalt with Ground Tire Rubber

Abstract

Laboratory studies about the interaction of asphalt cement with three different ground tire rubber (GTR) samples from different gradations were made using rheological and aging tests, and also chemical characterization tests. Rubber particle size, curing time, temperature and mixing rate were found to be important factors that affect the rubber depolymerization rate. It is possible to obtain homogeneous asphalt-rubber binders with nondetrimental viscosity at hot-mix temperatures, while still being elastic at rutting temperatures and less stiff at colder temperatures than base asphalt.The higher the rubber content in asphalt rubber, the better the cold stiffness properties and fatigue resistance, the lower the aging index. The proper combination of curing variables and asphalt composition is essential to assure good rheological properties. The high molecular size, the high asphaltenes content and high acidity in the asphalt cements resulted in blends more easily compatible and with good rheological properties.

Evaluating Aging Properties of Crumb Rubber and Styrene–Butadiene–Styrene Modified Binders

“…As illustrated in Figure 3c, for the CR9 binder in unaged condition, there is a plateau region at intermediate frequency range (about 10 Hz). This can be attributed to the elasticity of swollen rubber particles (23,30). The plateau region agrees with the δ P value of 61.7°, as shown in Table 4.…”

An investigation on using pre-treated tyre rubber as a replacement of synthetic polymers for bitumen modification

“…The assumption is that particles less than 75μm can be considered to be dissolved in the bitumen rather than present in the bitumen as solid intrusions. Increasing solubility of the RTR particles is usually associated with good storage stability with the test being undertaken to identify the final storage stability of the RTR-MBs product and the overall state of the material (Leite et al, 2001). Figure 6 shows the average RTR dissolution results for the different RTR types processed with bitumen "S" and "H".…”

Recycled Heavy Bio Oil as Performance Enhancer for Rubberized Bituminous Binders

“…The mechanism of HBO contributing to the modification of AR can be illustrated as follows. During the modification process through high shear mixing, chemical bonding and physical absorbing may result in redistribution of hydrocarbon chains [31,32]. Then one more compacted and steadier micro structure was obtained.…”