摘要
为了研究煤直接液化残渣（direct coal liquefaction residue,DCLR）改性沥青宏观性能与微观相对分子质量分布的关系,以70#沥青为基质沥青,对DCLR掺量（DCLR与基质沥青的质量比）分别为5%,10%,15%和20%的改性沥青,利用PG分级体系和针入度分级体系分析了DCLR对沥青宏观性能（高温性能、低温性能、疲劳性能）的影响;同时,采用凝胶色谱仪测试DCLR改性沥青的相对分子质量分布,分析分布参数LMS（大分子区）,MMS（中分子区）和SMS（小分子区）所占比例与沥青宏观性能之间的关系.结果表明：DCLR可显著改善沥青的高温性能,但也会明显降低沥青的低温性能和疲劳性能;DCLR改性沥青更适合作为沥青路面结构的中面层来提高路面的高温抗变形能力,建议DCLR的掺量为5%,适用于1～4气候分区;相对分子质量分布参数LMS所占比例与沥青的宏观性能具有显著的相关性,据此可建立两者在不同温度下的指数关系模型.
In order to study the macroscopic performance of direct coal liquefaction residue（DCLR）modified asphalt and its relationship with distribution of microscopic relative molecular mass,DCLR with different blending content（5%,10%,15%,20%）by mass were mixed with base asphalt（70#）.The performance at high temperature,low temperature and fatigue resistance of DCLR modified asphalt were evaluated in terms of penetration and PG performance grading system.The gel permeation chromatography was used to determine the relative molecular mass distribution of DCLR modified asphalt.The relationships between microscopic relative molecular mass distribution parameters（large molecular size（LMS）percentage,medium molecular size（MMS）percentage and small molecular size（SMS）percentage）and macroscopic performance of modified asphalt were investigated.The results indicate that with the blending of DCLR,the contents of heavy components in asphalt binder are increased.It can improve the high temperature performance of asphalt but reduce the low temperature performance and fatigue resistance performance of asphalt significantly.It is appropriate to be used as middle surface course material for DCLR modified binder to improve the ability of high temperature deformation resistance.The optimal DCLR blending content is 5% and it can be used in climate zone of 1-4.There are significant correlations between the percentage of LMS and macroscopic performance indicators of modified asphalt.The exponential models between them under different temperatures are built based on analysis results.
作者
许鹰
季节
索智
赵永尚
XU Ying JI Jiel, SUO Zhi ZHAO Yongshang(School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China Beijing Urban Transportation Infrastructure Engineering Technology Research Center, Beijing 100044, China Beijing Collaborative Innovation Center for Metropolitan Transportation, Beijing 100044, China Beijing Collaborative Innovation Center for Energy-Saving and Emission-Reduction, Beijing 100044, China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2016年第5期939-944,共6页
Journal of Building Materials
基金
北京市属高等学校高层次人才引进与培养计划项目(PXM2013-014210-000165)
国家自然科学基金青年基金资助项目(51308031)
关键词
煤直接液化残渣
改性沥青
宏观性能
相对分子质量分布
凝胶色谱分析
direct coal liquefaction residue（DCLR）
modified asphalt
macroscopic performance
relative molecular mass distribution
gel chromatography analysis
