Study on Adhesion Performance and Aging Strength Degradation Mechanism of SBS Modified Asphalt with Different Anti-Aging Additive

Abstract

After aging, the adhesiveness of asphalt deteriorates, leading to a reduction in the durability of asphalt mixtures and affecting the service life of asphalt pavements. To enhance the anti-aging performance of asphalt, this study employed the method of melt blending to prepare three types of modified asphalt: graphene/SBS modified asphalt (G/SBSMA), crumb rubber/SBS modified asphalt (CR/SBSMA), and petroleum resin/SBS modified asphalt (PR/SBSMA). Different dosages of the three types of modified asphalt were tested for changes in conventional performance indicators. The optimal dosages of graphene, crumb rubber, and C9 petroleum resin were determined to be 2%, 15%, and 5%, respectively. Based on the theory of surface free energy, the effects of anti-aging agents on the microscopic properties of SBS modified asphalt before and after aging were analyzed using the three-liquid method. The mechanisms of strength attenuation at the asphalt–aggregate interface under water exposure and aging were revealed. The results showed that with the increase of aging gradient, the asphalt-aggregate biphasic system became more active. The cohesive energy and peel energy of SBS modified asphalt increased continuously, while the adhesive energy decreased continuously, leading to a decrease in the energy ratio parameter. Resin-based anti-aging agents exhibited the most significant improvement in asphalt adhesion performance, while graphene demonstrated a more stable enhancement in asphalt’s water stability during the aging stage.

Investigation of Self-Healing Performance of Asphalt Mastic—From the Perspective of Secondary Aging

“…After primary and secondary aging, the fracture healing index (HI 2 ) of all the three types of mastics are only around 0.3, which are much smaller than the HI 1 values under each testing condition, and can hardly increase with an increasing healing temperature. (5) The recover effect of the rejuvenating agent will be degraded rapidly during the secondary aging process, though both the fatigue and fracture healing performance could be recovered to a certain extent by adding rejuvenating agent. Thus, more effective rejuvenating agents are on demand to be developed.…”

“…At present, the mainstream self-healing mechanisms include molecular diffusion energy, surface energy theory, capillary flow theory [4][5][6][7][8], etc.…”

Preparation and Road Performance Study of Rubber–Diatomite Composite-Modified Asphalt Mixture

“…Rubber is a common asphalt modifier known for its low cost, excellent high-temperature strength, and low-temperature cracking resistance [9]. Currently, composite modification techniques for rubber-modified asphalt have attracted considerable attention [10][11][12][13]. To further enhance the performance of rubber-modified asphalt, researchers have made significant efforts.…”