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摘要
基于动态剪切流变仪(DSR)实验,对经过短期老化前后不同木质素掺量的改性沥青高温流变性能进行分析。对比老化前后流变参数发现:木质素的掺入可显著增加老化前后沥青的储存模量G′,而对损失模量G″的降低影响较小,使得沥青的复数剪切模量(G*)增加,相位角(δ)减小,有助于提高沥青的高温稳定性;老化前木质素改性沥青的损耗因子(tanδ)小于基质沥青,而经过短期老化后tanδ小于基质沥青,表明短期老化后木质素改性沥青较基质沥青仍具有良好的黏性,木质素提高了沥青的抗老化性能;老化前后木质素改性沥青均具有较高的车辙因子(G*/sinδ),抗变形能力增强。此外,对不同木质素掺量下老化前后各流变参数分析,认为存在最佳掺量,木质素掺量在12%(wt,质量分数)时改性沥青具有较高的高温稳定性和抗老化性。
Abstract
Based on the dynamic shear rheometer test (DSR),the rheological properties of modified asphalt with different lignin content before and after short-term aging were analyzed.Compared with the rheological parameters before and after aging,it was found that the addition of lignin can significantly increase the storage modulus G′ of asphalt before and after aging,but had little effect on the decrease of storage modulus G″,which leaded to the increase of composite modulus G * and the decrease of phase angle δ of asphalt.The loss factor tanδ of lignin modified asphalt was smaller than that of base asphalt before aging,and the loss factor tanδ was smaller than that of base asphalt after short-term aging.The results showed that the lignin modified asphalt still had good viscosity compared with the base asphalt after short-term aging,and lignin improved the anti-aging performance,and the lignin modified asphalt had higher rutting factor G*/sinδ and better anti-deformation ability before and after aging.In addition,for the rheological parameters before and after aging with different lignin content.The optimum content of lignin was considered to exist,and the lignin content of 12% had higher temperature stability and anti-aging property.
关键词
沥青
/
木质素
/
短期老化
/
流变性能
Key words
asphalt
/
lignin
/
short-term aging
/
rheological property
短期老化对木质素改性沥青高温流变性能的影响[J].
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基金资助
云南省木材胶黏剂及胶合制品重点实验室开放基金项目(2015007);2015年地方高校国家级大学生创新创业训练计划项目(201510677002)
