Effect of aging and rejuvenation on adhesion properties of modified asphalt binder based on AFM

Abstract

The adhesion between asphalt binder and aggregate is very important to the performance and durability of asphalt pavement. In order to explore the characterisation of modified asphalt binder in microstructure during aging and rejuvenation, the virgin asphalt binder and three kinds of modified asphalt binder (styrene-butadiene-styrene block copolymer (SBS), rubber powder and high viscosity and high elasticity [HVHE] modifier) in different aging and rejuvenation condition were prepared. The micromorphology and surface adhesion were measured by atomic force microscopy. The average roughness value was used as the index to evaluate the micromorphology of asphalt binder. The surface adhesion was used as the index to evaluate the adhesion properties of asphalt binder.Results show that the "bee" structure of SBS-modified asphalt binder increased slightly after long-term aging, and the recovery effect of aromatics oil was the closest to that of the unaged one. The rubber powder-modified asphalt binder and HVHE-modified asphalt binder showed the spot structure. And no matter for short-term aging or long-term aging, aromatics oil had the best recovery effect on micro morphology. The adhesion of the three modified asphalts would decrease gradually after aging. The effects of three kinds of rejuvenator on the adhesion of SBS-modified asphalt binder and rubber powder-modified asphalt binder were different. Rejuvenator, aromatic oil and warm mix asphalt mixture (WMA) additive could rejuvenate the loss of adhesion of HVHE-modified asphalt binder to a certain extent.

Application of Atomic Force Microscopy as Advanced Asphalt Testing Technology: A Comprehensive Review

“…Ji et al [ 45 ] studied the microstructure of different modified asphalts by AFM at room temperature and low temperature. Guo et al [ 46 ] observed the microstructure of different proportions of short-term aging and long-term aging on fusion asphalt.…”

Evaluating the Rheological, Chemical and Morphological Properties of SBS Modified Asphalt-Binder under Multiple Aging and Rejuvenation Cycles

“…During the aging and rejuvenation processes, the change in the physico-rheological properties of the SBSMA can be attributed to the chemical composition and microstructures. Fourier transform infrared (FTIR), atomic force microscopy (AFM), environmental scanning electron microscope (ESEM), and other new technologies have been successfully applied to analyze the aging mechanism and rejuvenating process of SBSMA at a micro scale [11,[15][16][17][18][19][20][21][22][23][24][25]. FTIR was used to investigate the aging and rejuvenation mechanism of SBSMA as well as the relationship between the chemical and rheological characteristics by identifying the differences between the absorption peaks which represent the functional groups and contents in the asphalt-binder based on Lambert-Beer's Law [15][16][17][18].…”

“…The AFM can obtain the microscopic morphology of the asphalt-binder surface [10]. Guo et al [22] observed that the bee structures slightly increased after PAV aging, and rejuvenator made the microstructures larger. Ozdemir et al [23] studied aging effects of varying processing parameters on the phase structure of SBSMA.…”

Adhesion of Nano-ZnO Modified Asphalt and Its Influence on Moisture-Sensitive Properties of Mixtures

“…Lv et al [12,13] experimentally found that SBS, polyethylene, and rubber powder negatively afect modifed asphalt's adhesion properties. Some scholars have used AFM observations to fnd that graphene oxide can change asphalt microstructure and enhance asphalt-aggregate adhesion [14,15]. Incorporating an antistripping agent can signifcantly improve the adhesion between asphalt and aggregate while afecting the project cost [16,17].…”