老化对胶粉和SBS改性沥青流变性能的影响

发布时间：2018-05-06 02:21

本文选题：短期老化 + 聚合物改性沥青　；参考：《建筑材料学报》2015年03期

【摘要】：为研究短期老化作用对胶粉(CR)改性沥青和SBS改性沥青流变性能的影响,通过旋转薄膜烘箱试验(RTFOT)对CR改性沥青和SBS改性沥青进行短期老化,然后在不同温度和荷载频率下进行动态剪切流变试验(DSR),结合扫描电子显微镜(SEM),对CR改性沥青和SBS改性沥青的流变性能和微观结构进行了研究.结果表明:老化前橡胶粉及SBS改性剂都能与沥青达到良好共融,老化后SBS改性剂与沥青的界面结合状况却差于橡胶粉与沥青的界面结合状况;老化作用使CR改性沥青和SBS改性沥青由储存模量G′(弹性)占主导作用转向由损失模量G″(黏性)占主导作用的温度转化点向高温转移;短期老化作用在高温下对SBS改性沥青产生的影响较大;短期老化前后,CR改性沥青较SBS改性沥青具有更强的高温抵抗变形能力和抗车辙能力;随加载频率增大,2种改性沥青的高温抗车辙能力都得到增强.
[Abstract]:In order to study the effect of short term aging on rheological properties of modified asphalt (CR) and modified asphalt (SBS), CR modified asphalt and SBS modified asphalt were aged by rotating film oven test. Then the rheological properties and microstructure of CR modified asphalt and SBS modified asphalt were studied by dynamic shear rheological test under different temperature and loading frequency, combined with scanning electron microscope (SEM). The results showed that both rubber powder and SBS modifier could blend well with asphalt before aging, but the interfacial bonding between SBS modifier and asphalt after aging was worse than that between rubber powder and asphalt. Aging makes CR modified asphalt and SBS modified asphalt change from storage modulus (elasticity) to temperature transition point which is dominated by loss modulus G "(viscosity) to high temperature. Short-term aging has a great effect on SBS modified asphalt at high temperature, and CR modified asphalt has stronger resistance to deformation and rutting than SBS modified asphalt before and after short-term aging. With the increase of loading frequency, the rutting resistance of two kinds of modified asphalt at high temperature is enhanced.
【作者单位】：内蒙古工业大学土木工程学院;
【基金】：国家自然科学基金资助项目(11162012) 内蒙古自然科学基金资助项目(2014MS0507)
【分类号】：U414

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