Evaluation of properties and aging resistance of epoxy asphalt composite modified by ultraviolet absorber

Abstract

This research investigated the effect of ultraviolet absorber (UV‐531) on the properties of epoxy asphalt (EA) binders. EA binders were modified by adding UV‐531 absorber at contents of 0, 0.3, 0.6, 0.9, and 1.2 wt%, and composites were then subjected to ultraviolet (UV)‐based aging, including UV, oxygen, and heat treatment. Laboratory tests were conducted to assess UV absorption, viscosity, mechanical parameters, contact angle, microstructure, and chemical functional groups of absorber‐modified EA composites before and after aging. The results showed that the addition of UV‐531 resulted in enhanced UV absorption capacity, lower initial viscosity, and longer allowable application time for EA composites. The UV‐531 absorber has good compatibility with EA binders and does not weaken the performance of EA binders. From anti‐aging perspective, UV‐531 absorber effectively delayed the degradation of the physical, mechanical, and chemical structures of EA composites. The breakage of alkyl and ester groups of EA composites containing absorber was significantly reduced under aging conditions. Overall, the presence of UV‐531 retarded severe performance deterioration in EA composite. Considering aging improvement and economic cost, it is recommended to use a content of 0.9 wt% UV‐531 absorber as an anti‐aging agent for EA composites.

Molecular-Atomic Scale Insight on Asphalt–Aggregate Interface Interaction and Seawater Erosion with Different Aging-Resistant Materials Using Molecular Dynamics Simulations

“…LSMs primarily reflect and shield ultraviolet radiation, reducing the damage of ultraviolet rays to functional groups and chemical bonds of asphalt . LAMs absorb the energy of ultraviolet radiation and convert it into low-energy heat, reducing the direct damage of ultraviolet energy to asphalt . AOMs react with active free radicals in asphalt, stabilizing them and slowing down the chain reaction process of active free radicals in asphalt .…”

The effect of photooxidation aging on the cohesion and interfacial adhesion behavior of epoxy asphalt with a composite acidic curing system based on molecular simulation

“…10,11 The chemical components of EA undergo changes during photooxidation aging, which affects its mechanical properties. [12][13][14] The mechanical properties of EA depend on the cross-linking network of epoxy resin, as the modulus of epoxy resin is much higher than that of asphalt. 15 Different molecular segments were introduced into the epoxy resin cross-linking network to adjust the mechanical properties of EA by changing the type and ratio of curing agents.…”

Quantitative evaluation of asphalt blending characteristics in epoxy‐modified hot recycled asphalt mixtures based on 3D confocal fluorescence technology

“…To evaluate the effective content of old asphalt, some researchers have suggested that the mechanical properties of fused asphalt lie between those of old and new asphalt binders, making mechanical characteristics suitable measures for the DoB 13,14 . However, due to the thermosetting nature of epoxy asphalt, it is difficult to extract cured epoxy asphalt from the surface of aggregates for performance testing 15 . Therefore, new characterizing methods are needed to evaluate the blending between new and old asphalt in HMA containing both RAP and epoxy asphalt (hereinafter referred to as “epoxy‐modified hot recycled asphalt mixture”).…”

“…13,14 However, due to the thermosetting nature of epoxy asphalt, it is difficult to extract cured epoxy asphalt from the surface of aggregates for performance testing. 15 Therefore, new characterizing methods are needed to evaluate the blending between new and old asphalt in HMA containing both RAP and epoxy asphalt (hereinafter referred to as "epoxy-modified hot recycled asphalt mixture").…”

“…However, 2D imaging has certain limitations in representing the spatial morphology of the attenuation. In contrast, laser scanning confocal microscopy (LSCM) offers two advantages over other FM methods 15,18,19 : (1) the conjugate relationship between the illumination point and the observation point allows LSCM to effectively suppress stray fluorescence from areas not located at the measurement point on the same focal plane and fluorescence signals from planes near the measurement point; (2) during the measurement process, the object or focal plane can be moved and different sections can be observed by employing image processing methods for three-dimensional (3D) reconstruction of the overall specimen.…”