Abstract
Ultraviolet (UV) aging degrades the life span of asphalt pavement, nanomaterials used as modifiers exhibit good shielding function on UV light, but generally degrade the low-temperature property of asphalt, a compound modification was found to be a solution. In this study, nano-SiO2 and rubber powder were blended together with base asphalt to prepare compound modified asphalt. Compound modified asphalt with different blending dosages were subjected to UV light via a self-made UV aging simulation chamber. Basic performance tests and rheological tests were conducted including the UV aging influence. An optimum compound ratio was finally recommended based on the goal to remove the adverse effect of nano-SiO2 on the thermal cracking. Results show that the anti-UV aging property of asphalt is improved obviously due to the blocking function of nano-SiO2 and carbon black in rubber powder, and the enhancing effect of nano-SiO2 is found to be the most significant.
Highlights
Asphalt pavement is directly exposed to external factors during its service period, such as sunlight, oxygen, water, heat, and driving load
Li et al [22] conducted thermal oxygen aging tests based on the analysis of the composition and structure, the thermal oxygen aging mechanism of rubber powder modified asphalt was discussed in this study, results indicate that rubber powder modified asphalt has an excellent anti-aging performance
Xiao et al [24] carried out high-performance gel chromatography (HP-GPC) test on long-term aging samples of rubber powder modified asphalt, base asphalt and styrene-butadiene-styrene (SBS) modified asphalt to analyze the molecular distribution (MSD) of asphalt subjected to aging, it was found that the macromolecules of rubber asphalt showed the least increase in proportion, rubber powder is proved to improve the low-temperature cracking and aging resistance of asphalt
Summary
Asphalt pavement is directly exposed to external factors during its service period, such as sunlight, oxygen, water, heat, and driving load. Factors generally lead to properties degradation of paving material and service issues of pavement performance [1,2,3,4]. Aging type of asphalt materials is divided into thermal oxygen aging and photooxidative aging. The effect of aging on the performance of asphalt is very huge, aging will make the asphalt hard and brittle, and easy cracking degrades the road service capacity [6]. In some areas with strong ultraviolet (UV) light, UV aging becomes a predominant fact and seriously affects the rheological properties of asphalt and life span of asphalt pavement [7,8]. In current aging resistance evaluation specification, only thermal oxygen aging is included except for UV aging. Qian et al [5,7]
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