摘要: |
采用原子力显微镜(AFM)、动态剪切流变(DSR)试验,对比研究了SBS改性沥青与70#沥青老化前后微观表面力学性能与宏观力学性能的变化.研究发现,室温下SBS改性沥青与70#沥青微观表面均出现了类似蜂型的微观结构,且老化后蜂型结构聚集,70#沥青表现更为突出;SBS改性沥青较70#沥青微观力学性能更加稳定,从微观层面上证明了SBS改性沥青具有更好的抗老化性能,同时采用DSR试验对二者进行了对比研究,在宏观力学行为上也得出相同结论.对沥青微观表面杨氏模量与储存弹性模量进行线性回归拟合,结果显示二者显著相关,表明沥青微观表面杨氏模量对沥青储存弹性模量具有直接影响. |
关键词: SBS 沥青 原子力显微镜 微观力学 老化 黏弹力学 |
DOI:103969/j.issn.1007 9629201802026 |
分类号: |
基金项目:国家自然科学基金面上项目(51678251);中央高校基本科研业务费专项资金资助重点项目(2015ZZ074); 广东省科技厅科技计划项目(2014B010105005);广州市科技计划项目(1563000255) |
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Comparative Study on Micro and Macro mechanical Properties ofAsphalt before and after Aging |
YANG Zhen, ZHANG Xiaoning, YU Jiangmiao
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School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China
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Abstract: |
Atomic force microscopy(AFM) and dynamic shear rheometer(DSR) test were utilized to investigate the effect of aging on the micro mechanical properties and rheological properties of SBS modified asphalt and 70# asphalt. It was found that the bee like micro structures appeared in the surface of SBS modified asphalt and 70# asphalt at room temperature. The bee like micro structures gathered after PAV aging, and this phenomenon was more prominent in the surface of 70# asphalt. AFM study shows that the micro mechanical properties of SBS modified asphalt is more stable than that of 70# asphalt. It proves that SBS modified asphalt has better anti aging properties than 70# asphalt from microscopic level, and the DSR test reaches the same conclusion from macro mechanics. The results of linear regression analysis of micro surface Youngs modulus and storage elastic modulus show that they are significantly correlated, it indicates that the Youngs modulus of asphalt micro surface has a direct effect on storage elastic modulus of asphalt. |
Key words: SBS asphalt atomic force microscopy microscopic mechanics aging viscoelastic mechanics |