为了探究碳纳米管(CNTs)对苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青的高低温性能及储存稳定性的改善效果,采用动态剪切流变试验(DSR)与弯曲梁蠕变试验(BBR)对CNTs/SBS复合改性沥青的流变特性进行评价,并基于软化点差值、流变学指数和荧光显微镜图像分析胶结料中聚合物分散状态。结果表明:CNTs加入后进一步增强了SBS改性沥青的高温抗车辙性能,且随CNTs掺量增加,高温性能逐步提升。CNTs的加入对改性沥青低温蠕变性能有不利影响,1.0% CNTs掺量下复合改性沥青更具性能效益。CNTs可以显著地提升SBS在沥青中的分布状态,CNTs与SBS形成均匀网状结构,在提升储存稳定性的同时具备增强沥青抗变形的能力,且CNTs的最佳掺量为1.0%。
To study the carbon nanotubes (CNTs) effect on high and low temperature performance of styrene-butadiene-styrene block copolymer (SBS) modified asphalt and improve the effect of storage stability,the rheological properties of SBS modified asphalt were evaluated by dynamic shear rheological test(DSR) and bent beam creep test (BBC) under different CNTs content,and studied polymer dispersed in the binder based on the softening point difference,rheological index and fluorescence microscope image analysis.The results shown that CNTs can significantly improve the high temperature deformation resistance of the asphalt,and the high temperature performance was gradually improved with the increase of CNTs.The addition of CNTs had an adverse effect on the low temperature creep property of the asphalt,and the asphalt with 1.0% CNTs had better performance and benefit.CNTs can significantly improve the distribution of SBS in asphalt.CNTs and SBS formed uniform network structure,which had the ability to enhance the resistance to deformation of the asphalt while improving the storage stability,and the optimal dosage of CNTs was 1.0%.
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基金资助
国家自然科学基金(51808051);河南省科技攻关项目(212102310459)
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