摘要
为改善沥青高温性能及韧性,采用5%的SBS及掺量分别为0、0.4%、0.8%和1.2%微碳纤维对基质沥青进行复合改性,利用沥青常规指标、动态剪切流变、温度扫描、频率扫描、多应力重复蠕变、弯曲梁流变试验分析微碳纤维掺量对SBS改性沥青性能的影响。结果表明:掺入微碳纤维后,SBS改性沥青的针入度降低,软化点、延度、黏度、黏韧性、韧性均有所增加;SBS改性沥青的车辙因子G^(*)/sinδ显著提高,高温低频区复数模量增大、低温高频区复数模量减小,高、低频率区复数模量的差别越来越小;改性沥青累计应变、不可恢复蠕变柔量Jnr值明显降低,应变恢复率R值明显增加;改性沥青的劲度模量S值和蠕变速率m值变化不大,5%SBS+0.8%的微碳纤与5%SBS改性沥青低温等级相同,均为PG-28。可见,微碳纤维可显著提高SBS改性沥青的高温性能,对低温性能无不良影响,5%SBS掺量下微碳纤维最佳掺量为0.8%。
In order to improve the high temperature performance and toughness of asphalt, the matrix asphalt is modified with 5% SBS as well as 0.0%, 0.4%, 0.8% and 1.2% micro carbon fiber, respectively. The influence of micro carbon fiber content on the performance of SBS modified asphalt is analyzed by conventional asphalt index, dynamic shear rheological, temperature scanning, frequency scanning, multi-stress repeated creep and bending beam rheological. The results show that the penetration of SBS modified asphalt decreases and the softening point, elongation, viscosity, viscosity and toughness increase with the addition of micro carbon fiber;the rutting factors G^(*)/sin and δ of SBS modified asphalt increase significantly, and the complex modulus in high temperature and low frequency region increase, while that in low temperature and high frequency region decrease, and the difference between high and low frequency region becomes smaller and smaller;the cumulative strain and unrecoverable creep compliance Jnrvalue of SBS modified asphalt decrease obviously, while R value increases obviously;the S value and M value of SBS modified asphalt have minor change;and the low temperature grade of 5%SBS+0.8% micro carbon fiber is the same as that of 5% SBS, which is PG-28. It can be seen that micro carbon fiber can significantly improve the high temperature performance of SBS modified asphalt, with no adverse effect on the low temperature performance, and the optimal content of micro carbon fiber is 0.8% for the modified asphalt with 5% SBS.
作者
刘继法
孟伟
张涛
许士强
裴兆荣
赵全满
LIU Ji-fa;MENG Wei;ZHANG Tao;XU Shi-qiang;PEI Zhao-rong;ZHAO Quan-man(Tai'an Highway Planning and Design Institute,Tai'an 271000,China;School of Traffic Engineering,Shandong Jianzhu University,Jinan 250101,China)
出处
《公路》
北大核心
2022年第12期28-33,共6页
Highway
基金
山东省交通运输科技计划项目,项目编号2021B24
国家自然科学基金资助项目,项目编号51808322
山东建筑大学研究生教育质量提升计划资助项目,项目编号201107。
关键词
道路工程
微碳纤维
改性沥青
高温性能
低温性能
road engineering
micro carbon fiber
modified asphalt
high temperature performance
low temperature performance
