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材料导报  2020, Vol. 34 Issue (18): 18065-18073    https://doi.org/10.11896/cldb.19080207
  机非金属及其复合材料 |
考虑老化影响的岩沥青复合改性沥青流变特性及微观机制
王淋1, 郭乃胜1, 温彦凯1, 谭忆秋2, 尤占平3
1 大连海事大学交通运输工程学院,大连 116026
2 哈尔滨工业大学交通科学与工程学院,哈尔滨 150090
3 密歇根理工大学土木与环境工程系,美国霍顿 49931
Rheological Properties and Microscopic Mechanism of Rock Asphalt Composite Modified Asphalt with Consideration of Aging Effect
WANG Lin1, GUO Naisheng1, WEN Yankai1, TAN Yiqiu2, YOU Zhanping3
1 Transportation Engineering College, Dalian Maritime University, Dalian 116026, China
2 School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
3 Department of Civil and Environmental Engineering, Michigan Technological University, Houghton 49931, USA
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摘要 为研究考虑老化影响的岩沥青复合改性沥青的流变特性及微观机制,采用动态剪切流变仪(DSR)的频率扫描试验和时间扫描试验,对不同老化状态的岩沥青/SBS复合改性沥青(R/SMA)、岩沥青/胶粉复合改性沥青(R/CMA)、岩沥青改性沥青(RAMA)和SBS改性沥青(SBSMA)进行了粘弹特征和疲劳性能分析;采用荧光显微镜(FM)和傅里叶红外光谱仪(FTIR)对改性沥青的微观相态结构、改性共混机理以及老化机理进行了研究。研究结果表明:R/CMA具有较好的高温抗剪切变形能力;在热氧和压力老化作用下,添加5%岩沥青和2% SBS的R/SMA具有更低的频率敏感性和更好的体系兼容性,高岩沥青掺量的R/CMA具有更差的结构稳定性和体系兼容性。短期老化后,本研究的复合改性沥青普遍具有较好的抗疲劳性能;长期老化显著提高了SBSMA和RAMA的抗疲劳性能;不同老化状态下,添加5%岩沥青和18%胶粉的R/CMA均具有较优的疲劳性能。基于荧光显微试验可知,添加5%岩沥青和2% SBS的R/SMA表面平坦且光滑,在保证SBS三维连续网状结构的前提下,5%岩沥青颗粒的加入提高了空间网状结构的稳定性,从而提高了SBS的抗剪切变形能力;R/CMA表面存在凹槽和凸起,离散状态的球状岩沥青颗粒和不规则线状/网状结构的胶粉颗粒以相互独立的形态存在于沥青中,其中添加5%岩沥青和18%胶粉的R/CMA局部网络结构最显著。基于FTIR试验可知,R/SMA是一种以物理改性为主的共混体系,是物理结合并继承SBSMA与RAMA的性能特点;R/CMA是一种以物理改性为主、化学改性为辅的物-化改性共混体系;综合功能指标和老化指标分析可知,胶粉改性剂较SBS改性剂具有更强的羰基类和亚砜类化合物形成的抑制作用,即添加5%岩沥青和18%胶粉的R/CMA较添加5%岩沥青和2% SBS的R/SMA具有更好的抗老化性能。
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王淋
郭乃胜
温彦凯
谭忆秋
尤占平
关键词:  动态剪切流变仪  岩沥青复合改性沥青  疲劳特性  微观机理  功能指标    
Abstract: In order to investigate the rheological properties and microscopic mechanism of rock asphalt composite modified asphalt considering the aging effect, the frequency scanning test and time scanning test using dynamic shear rheometer (DSR) were conducted to analyze the viscoelastic characteristics and fatigue properties of rock asphalt/SBS composite modified asphalt (R/SMA), rock asphalt/crumb rubber composite modified asphalt (R/CMA), rock asphalt modified asphalt (RAMA) and SBS modified asphalt (SBSMA). The microstructure, modification mechanism and aging mechanism of the modified asphalts were studied by fluorescence microscopy (FM) and Fourier transform infrared spectroscopy (FTIR). The results showed that R/CMA exhibited good shear deformation resistance at high temperatures. Thermal oxygen and pressure aging reduced the frequency sensitivity of the R/SMA sample with 5% rock asphalt and 2% SBS and the compatibility of its system were improved. The R/CMA with high rock asphalt content showed poor structural stability and system compatibility after aging. The composite modified asphalts in this study generally had better fatigue resistance after short-term aging, while the fatigue resistance of SBSMA and RAMA was significantly improved after the long-term aging. Under different aging conditions, the R/CMA added 5% rock asphalt and 18% crumb rubber modifier presented excellent fatigue performance. The fluorescence microscopy test results indicated that the surface of the R/SMA with 5% rock asphalt and 2% SBS was flat and smooth. Without destroy the three-dimensional continuous network structure of the SBS, the addition of 5% rock asphalt improved the stability of the spatial network structure, and thus improved the shear deformation resistance of the SBSMA. There are grooves and protrusions on the surface of the R/CMA, and the discrete spherical particles of rock asphalt and irregular linear or reticular rubber powder particles were dispersed in asphalt phase independently, in which the local network structure of the R/CMA with 5% rock asphalt and 18% crumb rubber was the most significant in the all modified asphalts. The FTIR test results indicated that R/SMA presented a physically modification that inhe-rited the characteristics of both SBSMA and RAMA. The R/CMA showed a physical-chemically modification that was dominated by physical modification and supplemented by chemical modification. Based on comprehensively analyzing the functional indexes and aging indexes, the crumb rubber modifier presented superior inhibition effect on the formation of carbonyl and sulfoxide compounds than the SBS modifier, which meant the R/CMA with 5% rock asphalt and 18% crumb rubber exhibited better anti-aging properties than the R/SMA with 5% rock asphalt and 2% SBS.
Key words:  dynamic shear rheometer    rock asphalt composited modified asphalt    fatigue performance    microscopic mechanism    functional index
                    发布日期:  2020-09-12
ZTFLH:  U414  
基金资助: 国家自然科学基金(51308084);中央高校基本科研业务费专项基金项目(3132017029)
通讯作者:  naishengguo@126.com   
作者简介:  王淋,2017年毕业于辽宁工程技术大学,获得工学硕士学位。现为大连海事大学博士研究生,指导教师为郭乃胜教授。主要研究方向为沥青及沥青混合料。
郭乃胜,2007年3月份毕业于大连海事大学,获得工学博士学位。2009—2012年在哈尔滨工业大学进行博士后研究工作。2013—2014年在美国密歇根理工大学作访问学者。现任大连海事大学交通运输工程学院教授。研究方向为沥青与沥青混合料,近年来在国内外学术期刊发表学术论文60余篇,其中SCI、EI检索30余篇。
尤占平,2003年毕业于美国伊利诺伊大学-香槟分校,获土木工程博士学位,历任美国德克萨斯农工大学金斯维尔分校助理教授,密歇根理工大学助理教授,副教授(终身教授),教授。美国注册职业土木工程师,2010年10月起任长安大学公路学院教授、博士研究生导师、陕西省“三秦学者”特聘教授。2014年入选教育部“长江学者奖励计划”,受聘为长安大学“长江学者”讲座教授。研究方向为:沥青混合料微观结构与力学、沥青材料性能表征与测试方法、沥青混合料性能优化、沥青路面设计方法、新型环保型沥青材料。发表文章200余篇,其中88篇被SCI收录,所发表文章被引用3 300余次。
引用本文:    
王淋, 郭乃胜, 温彦凯, 谭忆秋, 尤占平. 考虑老化影响的岩沥青复合改性沥青流变特性及微观机制[J]. 材料导报, 2020, 34(18): 18065-18073.
WANG Lin, GUO Naisheng, WEN Yankai, TAN Yiqiu, YOU Zhanping. Rheological Properties and Microscopic Mechanism of Rock Asphalt Composite Modified Asphalt with Consideration of Aging Effect. Materials Reports, 2020, 34(18): 18065-18073.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19080207  或          http://www.mater-rep.com/CN/Y2020/V34/I18/18065
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