氧化石墨烯复配多聚磷酸改性沥青流变特性及抗热氧老化性能  

Rheological Properties and Thermal Oxygen Aging Resistance of GO/PPA Modified Asphalt

作　　者：黄建云 马庆伟 黄路 HUANG Jianyun;MA Qingwei;HUANG Lu(Xi'an Highway Research Institute,Xi'an 710065,Shaanxi,China;Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University,Shanghai 201804,China;School of Materials Science and Engineering,Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]西安公路研究院,陕西西安710065 [2]同济大学道路与交通工程教育部重点实验室,上海201804 [3]长安大学材料科学与工程学院,陕西西安710064

出　　处：《重庆交通大学学报（自然科学版）》2023年第4期71-79,共9页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：陕西省交通科技项目(19-10K);陕西省交通科技项目(16-41T)。

摘　　要：采用动态剪切流变(DSR)、多重应力蠕变恢复(MSCR)及弯曲梁流变(BBR)试验,研究了掺加氧化石墨烯(GO)、多聚磷酸(PPA)及其复配改性沥青老化前后的流变特性与抗热氧老化性能,并通过凝胶渗透色谱(GPC)分析了沥青不同热氧老化状态下的分子量。结果表明:掺加氧化石墨烯、PPA能显著改善沥青的高温抗变形能力和弹性变形恢复能力,与SBS改性沥青相比,氧化石墨烯复配PPA改性沥青老化前后的抗车辙因子更大,不可恢复蠕变柔量更小,且老化前后各项指标变化幅度更小,其高温抗变形能力、弹性恢复性能及抗高温热氧老化性能优于SBS、SBR改性沥青;通过氧化石墨烯复配PPA显著降低了老化前后沥青的劲度模量及老化后劲度模量的增幅,有效改善了沥青的低温抗变形能力及抗低温老化性能,其低温抗裂性能与SBR改性沥青相当;老化前后氧化石墨烯复配PPA改性沥青不同分子量的分布区域更窄,RTFOT、PAV老化后,氧化石墨烯复配PPA改性沥青的分子量(M_(w)、M_(n))及分散系数d的变化幅度相较于SBS、SBR改性均更小,其抗热氧老化稳定性更强。Through dynamic shear rheological(DSR),multiple stress creep recovery(MSCR) and bending beam rheological(BBR) test,the rheological properties and thermal oxygen aging resistance of asphalt mixed with graphite oxide(GO),polyphosphoric acid(PPA) and its compound before and after aging were studied.The molecular weight of asphalt under different thermal oxygen aging conditions was analyzed by GPC.The results show that the addition of GO and PPA can significantly improve the high-temperature deformation resistance and elastic deformation recovery of asphalt.Compared with SBS modified asphalt,the anti-rutting factor of graphite oxide compounded PPA modified asphalt before and after aging is larger,and the unrecoverable creep compliance is smaller;and the change range of each index before and after aging is also smaller,and its high-temperature deformation resistance,elastic recovery performance and high-temperature thermal oxygen aging resistance are better than SBS and SBR modified asphalt.The stiffness modulus before and after aging and the increase of stiffness modulus after aging are significantly reduced by graphene oxide compound PPA,which effectively improves the low-temperature deformation resistance and low-temperature aging resistance of asphalt,and its low-temperature cracking resistance is equivalent to that of SBR modified asphalt.The distribution area of different molecular weight of graphene oxide compound PPA modified asphalt is narrower before and after aging.Compared with SBS and SBR modified asphalt,the M_W,M_n and dispersion coefficient d of graphene oxide compound PPA modified asphalt are smaller after RTFOT and PAV aging,and its thermal oxidative aging resistance stability is stronger.

关 键 词：道路工程 改性沥青 氧化石墨烯 多聚磷酸 热氧老化 流变特性 

分 类 号：U414[交通运输工程—道路与铁道工程]