Thermal and cold flow properties of bio-derived rejuvenators and their impact on the properties of rejuvenated asphalt binders

Abstract

Rejuvenators are widely used to improve the properties of asphalt binders particularly low temperature and fatigue cracking behavior. Rejuvenators vary significantly in terms of their physical properties and chemical composition. The nature of the interaction between the rejuvenators and the base asphalt binders is very complex and an extensive study into the chemical and thermal properties of the rejuvenators and how they impact the rheological properties of rejuvenated binders is of paramount importance. In this research, a neat PG58-28 binder is rejuvenated with three different materials produced from soybean oil at a dosage of 6% by total weight of binder. The rheological properties of the control and rejuvenated binders are assessed using performance grades showing a drop in both the critical low and high temperature grades with rejuvenation. The oxidative stability of the rejuvenators as well as the rejuvenated binders is studied using thermogravimetric analysis (TGA). The crystallization and melting points of the rejuvenators are observed using differential scanning calorimetry (DSC). DSC is also used to examine the glass transition temperatures of the control and rejuvenated binders. The TGA results showed one of the rejuvenators to be susceptible to oxidation which agreed with the rolling thin film oven (RTFO) mass loss results. The glass transition temperature of the rejuvenated binders decreased denoting improved low temperature cracking properties in line with the performance grade results.

Unlocking the Hidden Potential of Cosmetics Waste for Building Sustainable Green Pavements in the Future: A Case Study of Discarded Lipsticks

“…By carefully screening the data reported in Figure 7 , it can be noticed that the incremental incorporation of WLS into the neat binder has generated one more additional glass transition temperature (T g3 ) located within 27~35 °C range, which is more presumably related to the maltene-asphaltene phase mixture, strikingly rich in resins material. Moreover, the additive treatment did not alter the DSC profile of binder but reduced its glass transition temperatures to some extent; possibly boosting its performance at lower temperatures [ 101 ].…”

From Street to Road: An Innovative Approach to Explore Discarded Chewing Gum as a Performance-Enhancing Modifier for Road Pavement Applications

“…Comparisons of the DSC scan data indicate that the addition of 6 or 9 wt% waste gum into the neat binder shifted its glass transition temperatures downward, possibly enhancing its low-temperature performance [61].…”

Analysis of Interface Fusion Effect between Old and New Asphalt under Plant Mixing and Cold Recycling Mode Based on Molecular Dynamics Simulation

“…At present, China’s pavement rejuvenation technology can be divided into thermal rejuvenation and cold rejuvenation [ 11 , 12 , 13 , 14 ]. Compared to cold rejuvenation, thermal rejuvenation technology will cause a large amount of pollution, which is not conducive to energy conservation [ 15 , 16 ]. The plant mixed cold rejuvenation is more convenient than local cold rejuvenation, so the technology has a very objective development prospect [ 17 , 18 , 19 , 20 ].…”