纳米粒子改性橡胶沥青抗老化性能研究  

Study on Anti-aging Properties of Nanoparticle Modified Rubber Asphalt

作　　者：彭博 凌天清[2] 葛豪 PENG Bo;LING Tianqing;GE Hao(School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学材料科学与工程学院,重庆400074 [2]重庆交通大学土木工程学院,重庆400074

出　　处：《材料导报》2022年第20期265-272,共8页Materials Reports

摘　　要：沥青老化是铺装道路劣化的重要因素之一,严重缩短沥青混凝土路面的使用寿命,增加维护成本,导致碳排放增多。在低碳、环保政策的驱动下,提高沥青抗老化性、延长沥青混凝土路面使用寿命成为亟待解决的问题。无机纳米粒子的高活性、高表面能等特点使其具有改善沥青抗老化性的可能性,故本工作以废弃胶粉改性沥青为基体,以不同掺量(1%、2%、3%,质量分数,下同)掺入纳米ZnO、纳米SiO_(2)和纳米TiO_(2)改性剂制备复配改性沥青,探究无机纳米粒子对沥青抗老化性能的影响及作用机理。试验结果显示:掺入无机纳米粒子的改性沥青的抗老化性有显著提升,其中掺入2%纳米TiO_(2)时,改性沥青的抗老化性能的改善效果最佳,在经过光氧老化后残留针入度比改性前提升了13.2%,软化点增量降低了60.7%。无机纳米粒子的掺入提高了沥青的紫外光吸收能力,并优化了其内部峰结构,从而提升沥青的粘弹性及高温性能,增强其抗老化性。该试验结果对制备抗老化沥青、长寿命沥青混凝土路面有指导意义。Asphalt aging is one of the important factors for the deterioration of paved roads,which seriously reduces the service life of asphalt concrete pavements,increases maintenance costs,and leads to more carbon emissions.Driven by low-carbon and environmental protection policies,improving the aging resistance of asphalt and prolonging the service life of asphalt concrete pavement have become an urgent problem to be solved.The high activity and high display energy of inorganic nanoparticles make it possible to improve the aging resistance of asphalt.The high activity and high display energy of inorganic nanoparticles make it possible to improve the aging resistance of asphalt.Therefore,in this study,waste rubber powder modified asphalt was used as the matrix,and different dosages(1%,2%,3%,mass fraction)was mixed with nano-ZnO,nano-SiO_(2)and nano-TiO_(2)respectively to prepare modified asphalt,and the effect and mechanism of inorganic nanoparticles on the anti-aging performance of asphalt were explored.The test results show that the aging resistance of asphalt modified by incorporating inorganic nanoparticles is significantly improved.When 2wt%nano-TiO_(2)is added,the improvement effect of asphalt aging resistance is the best,and the residual penetration after photo-oxidative aging compared with that before modification,it increased by 13.2%,and the softening point increment decreased by 60.7%.The incorporation of inorganic nanoparticles improves the UV light absorption ability of the asphalt and optimizes the internal peak structure,thereby enhancing the viscoelasticity of the modified asphalt and delaying the aging of the asphalt.The test results have guiding significance for the preparation of anti-aging asphalt and long-life asphalt concrete pavement.

关 键 词：无机纳米粒子 抗老化性能 流变性能 微观形貌 

分 类 号：U414[交通运输工程—道路与铁道工程]