蛭石与纳米氧化锌协同增效延缓SBS改性沥青老化及其机理研究

SBS改性沥青老化已成为引起沥青路面病害和缩短路面服役寿命的主要原因之一。因此，提高SBS改性沥青的耐老化性能对于长寿命沥青路面建设具有重要意义。然而，目前研究者主要针对SBS改性沥青的热老化和光老化单独寻求防治措施。为此，本项目利用蛭石与纳米氧化锌的协同增效作用，综合改善SBS改性沥青的耐光热复合老化性能。探明蛭石的插层改性和纳米氧化锌的表面修饰对SBS改性沥青路用性能的影响规律，实现二者在SBS改性沥青中的纳米尺度分散，探明蛭石与纳米氧化锌复配SBS改性沥青及其混合料在老化过程中组成、结构与性能的变化特征，揭示二者延缓SBS改性沥青老化的协同增效作用机理，最后通过自然暴晒光热复合老化来验证该材料的耐老化性能。研究成果将突破传统抗老化方法将热老化和光老化分开采取防治措施的局限，达到同时改善SBS改性沥青耐热氧和光氧老化的目标，为耐久性道路材料制备和长寿命沥青路面建设提供可靠的技术手段。

Aging of styrene-butadiene-styrene copolymer (SBS) modified asphalt has been one of the main reasons causing pavement distresses and shortening service life of asphalt pavement. It is of great significance for perpetual asphalt pavement construction to enhance aging resistance of SBS modified asphalt. However, current researchers mainly focus on finding single measures to separately prevent the thermal or ultraviolet aging of SBS modified asphalt. Therefore, in this project, micron grade vermiculite as two-dimensional nanomaterials and nano-zinc oxide as zero-dimensional nanomaterials will be used to improve the thermal and ultraviolet composite aging resistance of SBS modified asphalt simultaneously by means of the synergistic interaction of multi-scale nanomaterials. The effect of organic intercalation modification of vermiculite and surface modification of nano-zinc oxide on physical and rheological properties of SBS modified asphalt will be ascertained so that whether the composite will reach nanoscale dispersion in SBS modified asphalt can be evaluated. The synergistic interaction mechanism of multi-scale nanomaterials on improving the aging resistance of SBS modified asphalt will be revealed through uncovering evolution features of components, structures and performance of multi-scale nanomaterials composite SBS modified asphalt and its mixture during aging processes. Finally, the thermal and ultraviolet composite aging under natural exposure to the sun will be used to verify the anti-aging ability of multi-scale nanomaterials. The findings will break through the limitation in traditional anti-aging methods that separate the thermal and ultraviolet aging, and achieve the objective of improving the thermal and ultraviolet aging resistance of SBS modified asphalt at the same time. It will provide reliable technological means for preparing durable road materials and designing perpetual asphalt pavement.