Speaker
Description
Waxes have long been used as rheological modifiers in warm mix asphalt, reducing viscosity at high temperatures and improving workability. Vari-ous percentages of Sasobit (S) and two types of Polyethylene waxes (PEQ and PEG) were used, ranging from 1% to 5% by mass. The rheological prop-erties of the binder were evaluated by mechanically blending the binder at speeds ranging from 1000 to 2000 rpm. Rheological testing was conducted to determine the optimal percentage of wax additives in warm mix binders. A dynamic-shear rheometer (DSR) measured complex modulus, rutting, and fatigue. Additions of wax additives increased the binder stiffness. During high-temperature rheological tests, the viscosity is reduced, allowing the binder to be mixed at a lower temperature than the hot mix. Meanwhile, the binder mixing speed only slightly influences the rheological properties. However, in contrast to a 1000-rpm mixer, the 2000-rpm mixer enhances the uniform mixing of the mixture. This results in a more understandable pattern of rheological results. According to all rheological parameters, PEG is comparable to S. Therefore, 3% wax additives are ideal for Taiwan warm mix binders. These findings provide valuable insights into the rheological properties of wax-based warm mix binders and their potential benefits for asphalt performance, contributing to the existing body of knowledge in this field.
