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.
作者
彭博
凌天清
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)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第20期265-272,共8页
Materials Reports
关键词
无机纳米粒子
抗老化性能
流变性能
微观形貌
inorganic nanoparticles
anti-aging property
rheological property
micromorphology
作者简介
彭博,2020年6月于重庆交通大学获得工学学士学位。现为重庆交通大学材料科学与工程学院硕士研究生,在凌天清教授的指导下进行研究。目前主要从事新型道路建筑材料的研究。;凌天清,重庆交通大学教授、博士研究生导师,1996年于同济大学获得博士学位,主要从事路基路面设计与维修养护工作。国内核心期刊、国际期刊和国际国内学术会议上公开发表学术论文100余篇。同时,主编面向21世纪交通版教材《道路工程》等2部,参编交通部教材《路基路面工程》等2部,编著出版“十一五国家重点出版工程《边坡与滑坡工程治理》”等级别的学术专著3部。lingtq@163.com。
