纳米SiO_2/沥青改性环氧树脂的抗冲蚀磨损性能

为了降低强风沙流区混凝土的冲蚀磨损,常采用环氧树脂材料对其进行防护,但环氧树脂材料存在交联度高、脆性较大等缺点。为此,采用纳米Si O2和沥青对环氧树脂进行了改性,研究了改性环氧树脂的力学性能和冲蚀磨损性能,并分析了其冲蚀磨损机理。结果表明:纳米Si O2和沥青共同改性环氧树脂不仅提高了环氧树脂的拉伸强度,同时改善了环氧树脂的冲击韧性;改性环氧树脂材料表现出半塑性材料的冲蚀特征,最大冲蚀率出现在45°冲蚀角,冲蚀率与冲蚀速率呈指数关系,速率指数为2.65~3.25;1%纳米Si O2和10%沥青协同改性的环氧树脂表现出了良好的冲蚀抗力,是强风沙流环境下混凝土结构冲蚀磨损防护的可选材料。

Erosive Wear Properties of Epoxy Resin Modified by Nano-SiO2 and Asphalt

Epoxy resin materials were modified by nano-SiO2 and asphalt,and their mechanical properties and erosion wear resistance were tested.Furthermore,the erosion wear mechanism was analyzed.Results showed that the synergistic modification of nano-SiO2 and asphalt for epoxy resin could not only improve the tensile strength of the epoxy resin,but also improve the impact toughness.The modified epoxy resin indicated semi ductile erosion behaviors,with peak erosion rate at 45° impact angle.Its erosion rate presented exponential relationship with wind-sand flow velocity,and the velocity index was 2.65-3.25.The epoxy resin modified synergistically by 1％ nano-SiO2 and 10％ asphalt performed good erosion resistance,which was a promising material as protective material for concrete structure under blown sand environment.