【作者】 王涛；

【导师】 张玉贞；

【作者基本信息】 中国石油大学 ， 化学工艺， 2007， 硕士

【摘要】 本文考察了工艺条件对聚合物改性沥青流变性质的影响并通过流变性评价确定了最佳的制备工艺条件。用几种流变性评价方法和热分析法测试了最佳工艺条件下制备的不同LSBS含量的改性沥青的流变性,并确定简便有效的流变性评价方法和评价指标。通过研究发现,剪切时间、剪切速率、发育时间等加工条件对改性沥青的流变性均有不同程度的影响,以流变性指标作为参考,确定了制备改性沥青的最佳工艺参数。用不同温度和不同拉伸速率条件下的测力延度实验研究上述的LSBS改性沥青的流变性质,在众多的测力延度实验指标中确定出评价改性沥青感时、感温性的有效指标。通过对不同L-SBS加入量改性沥青流变性质的研究发现,改性剂的加入量、温度、荷载、时间、拉伸速率等因素对改性沥青的流变性质有重要影响。针入度法、弹性恢复法和测力延度法可以作为评价改性沥青的感时、感温性以及对荷载的敏感性的有效评价方法,其中,测力延度法可以综合拉伸柔度、粘弹比、SBS的当量劲度作为评价沥青改性效果和改性沥青低温性能的指标。DSC试验结果可以预测改性沥青相容性和改性沥青高、低温性和感温性等流变性质,表现为吸热量的变化。更多还原

【Abstract】 The research examined the influence of process conditions on the rheological characteristic of polymer modified asphalt and explored the optimal process conditions, tested the rheological characteristic of modified asphalt with different LSBS content by means of rheological characteristic assessment methods and thermal analysis method, and ascertained effective rheological characteristic assessment methods and evaluating indicators.It was indicated that many process factors, such as shearing time, shearing velocity and development time would affect the rheological characteristic of modified asphalt to some different extent, and the optimal technological parameter was ascertained with reference to rheological characteristic indicators. Force and ductility test was used to evaluate the rheological characteristic of the above LSBS modified asphalt sample, and effective indicators of evaluating temperature sensitivity, time sensitivity of the sample were determined among the numerous experiment indicators.It was found that modifier content, temperature, load time and rate of extension have considerable influence on rheological characteristic of modified asphalt. The method of penetration, elastic recovery, force and ductility test could be used as effective methods of evaluating time sensitivity, temperature sensitivity and load sensitivity. And among them, force and ductility test could integrate with extension compliance, viscoelastic proportion and equivalent stiffness to evaluate the asphalt modified effect and cryogenic property. DSC experimental result could predict compatibility of LSBS and base asphalt, high temperature performance, cryogenic property and temperature sensitivity performance and so on, with a change of heat absorption capacity.更多还原