Xu Wei, Wei Jintao, Chen Zhengxiong, Wang Feng, Zhao Jian
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China.
China Railway Construction Bridge Engineering Bureau Group Southern Engineering Co., Ltd., Guangzhou 511400, China.
Materials (Basel). 2021 Apr 16;14(8):2003. doi: 10.3390/ma14082003.
The type and fineness of a filler significantly affect the performance of an asphalt mixture. There is a lack of specific research on the effects of filler fineness and dust from aggregates on the properties of epoxy asphalt (EA) mixtures. The effects of aggregate dust and mineral powder on the properties of an EA mixture were evaluated. These filler were tested to determine their fineness, specific surface area and mineral composition. The effects of these fillers on the EA mastic sample and mixture were evaluated. The morphology of the EA mastic samples was analyzed using scanning electron microscopy (SEM). The effects of the fillers on the Marshall stability, tensile strength and fatigue performance of the EA mixture were evaluated. The dust from the aggregates exhibited an even particle size distribution, and its average particle size was approximately 20% of that of the mineral powder. The SEM microanalysis showed that the EA mastic sample containing relatively fine dust formed a tight and dense interfacial bonding structure with the aggregate. The EA mixture sample containing filler composed of dust from aggregate had a significantly higher strength and longer fatigue life than that of the EA sample containing filler composed of mineral powder.
填料的类型和细度对沥青混合料的性能有显著影响。目前缺乏关于填料细度和集料粉尘对环氧沥青（EA）混合料性能影响的具体研究。评估了集料粉尘和矿粉对EA混合料性能的影响。对这些填料进行了测试，以确定其细度、比表面积和矿物成分。评估了这些填料对EA胶浆样品和混合料的影响。使用扫描电子显微镜（SEM）分析了EA胶浆样品的形态。评估了填料对EA混合料的马歇尔稳定性、抗拉强度和疲劳性能的影响。集料粉尘的粒径分布均匀，其平均粒径约为矿粉平均粒径的20%。SEM微观分析表明，含有相对细粉尘的EA胶浆样品与集料形成了紧密致密的界面粘结结构。含有由集料粉尘组成的填料的EA混合料样品比含有由矿粉组成的填料的EA样品具有显著更高的强度和更长的疲劳寿命。
