Yang Qingguo, Chen Kelin, Guan Longfei, Li Ya, Li Yunhao, Zhou Yu, Yin Wujing
School of Civil Engineering, Chongqing Jiaotong University, Chongqiong 400074, China.
Materials (Basel). 2025 Jun 26;18(13):3039. doi: 10.3390/ma18133039.
With the increase in heavy-load traffic and the growing frequency of extreme weather events, traditional rock aggregates, due to poor morphological stability, are unable to meet the performance requirements of high-grade asphalt pavements in complex environments. Most existing research on metal reinforcement focuses on fiber forms. This study innovatively introduces L-shaped multi-faceted metal aggregates (LFMAs). Through surface energy analysis and tests such as the Marshall test, rutting test, water immersion Marshall test, and freeze-thaw splitting test, the effects of the dosage and particle size of LFMAs on the performance of asphalt mixtures are explored. The results show that LFMAs can form an effective bond with SBS modified asphalt, improving the high-temperature stability and low-temperature crack resistance of asphalt mixtures. Under both water immersion and freeze-thaw conditions, the resistance of asphalt mixtures to water damage decreases with the increase in the dosage of metal aggregates. This research expands the application of three-dimensional metal aggregates, breaks through the limitations of fiber-based materials, and provides a new direction for the development of high-performance asphalt mixtures.
随着重载交通量的增加和极端天气事件发生频率的上升，传统岩石集料由于形态稳定性差，无法满足复杂环境下高等级沥青路面的性能要求。现有的大多数关于金属增强的研究都集中在纤维形式上。本研究创新性地引入了L形多面金属集料（LFMAs）。通过表面能分析以及马歇尔试验、车辙试验、浸水马歇尔试验和冻融劈裂试验等测试，探究了LFMAs的用量和粒径对沥青混合料性能的影响。结果表明，LFMAs能与SBS改性沥青形成有效粘结，提高沥青混合料的高温稳定性和低温抗裂性。在浸水和冻融条件下，沥青混合料的水损害抵抗能力随金属集料用量的增加而降低。本研究拓展了三维金属集料的应用，突破了纤维基材料的局限，为高性能沥青混合料的发展提供了新方向。
