摘要
为研究聚乙二醇改性沥青的技术性能,采用布氏黏度仪、针入度仪、软化点仪和延度仪测定不同聚乙二醇掺配率下沥青的布氏黏度、25℃针入度、软化点和15℃延度,分析了不同聚乙二醇掺配率下沥青的性能;对原基质沥青和聚乙二醇改性沥青进行旋转薄膜烘箱老化,测定老化后两种沥青的残留针入度比和残留延度,分析聚乙二醇改性沥青的老化性能;通过改变布氏黏度仪转子型号,在不同剪切速率下测定聚乙二醇沥青的黏度,获得聚乙二醇沥青的黏度—剪切速率曲线,分析了沥青的流变特性;通过黏温曲线获得聚乙二醇改性沥青混合料的施工温度,对聚乙二醇沥青混合料的施工温度进行了分析。研究结果表明:随着聚乙二醇添加率的增加,沥青的黏度增加、针入度减小、软化点升高、延度降低;聚乙二醇改性沥青的耐老化性能优于原基质沥青;聚乙二醇改性沥青在163℃的黏度随着剪切速率的增加而降低,呈现一定的非牛顿特性;通过黏温曲线获得的聚乙二醇改性沥青混合料的施工温度略高于普通沥青混合料的施工温度。
For the research of the technology performance of PEG modified asphalt, Brookfield viscometer, penetrometer, softening point meter and ductility instrument are used to determine the Brookfield viscosity, 25℃ penetration, softening point and 15℃ ductility, and the performance of the asphalt under different PEG blending ratio is analyzed. The matrix asphalt and PEG modified asphalt are aged through RTFOT, then residual penetration ratio and residual ductility are determined, and the aging performance of PEG modified asphalt is analyzed. By changing the rotor model of Brookfield viscometer, the viscosity of PEG modified asphalt under different shear rate is defined, and the rheological property of asphalt is discussed. After that the construction temperature of PEG modified asphalt mixture is obtained through the viscosity-temperature curve and the construction temperature of PEG modified asphalt mixture is analyzed. The results show that with the increase of the blending rate of PEG, viscosity and softening point increase and penetration and ductility decrease; the ageing performance of PEG modified asphalt is better than that of matrix asphalt; the viscosity of PEG modified asphalt under 163℃ decreases with the increasing of shear rate, and presents the non-newtonian feature; and the construction temperature of PEG modified asphalt mixture obtained through the viscosity-temperature curve slightly higher than the common asphalt mixture.
出处
《公路》
北大核心
2014年第10期226-229,共4页
Highway
基金
中国博士后科学基金项目,项目编号2013M532004
甘肃省科技支撑计划,项目编号1011GKCA020
中央高校基本科研业务费专项资助,项目编号CHD2011JC164
关键词
道路工程
改性沥青
聚乙二醇
相变材料
沥青性能
road engineering
modified asphalt
polyethylene glycol
phase change material
asphalt performance
