基于国内外试验方法的橡胶沥青性能测试

发布时间：2018-04-11 05:15

本文选题：道路工程 + 橡胶沥青　；参考：《交通运输工程学报》2015年01期

【摘要】：为统一橡胶沥青性能试验的评价指标,分别采用不同胶粉掺量对70#和90#的基质沥青进行改性,基于中国规范中的针入度、延度、软化点和弹性恢复试验以及Superpave中的动态剪切流变试验、布氏旋转粘度试验和弯曲梁流变试验等对橡胶沥青进行了性能评价。研究结果表明:胶粉的添加能显著改善沥青的高温性能,显著降低沥青的温度敏感性,但增大了沥青的高温粘度,增加了沥青混合料的拌和与压实难度;胶粉的溶胀作用会导致针入度的试验结果出现较大误差,因此,不建议采用针入度试验来评价橡胶沥青的性能;软化点可作为橡胶沥青高温性能的一个评价指标,对于90#基质沥青,胶粉掺量分别为10%、15%、20%和25%时的软化点比未掺胶粉时的软化点分别提高了11.23、11.97、15.18、21.10℃,对于70#基质沥青,胶粉的添加则使其软化点分别提高了4.02、8.18、12.83、14.45℃,因此,胶粉对70#基质沥青软化点的影响效果要大于对90#基质沥青的影响效果;胶粉对沥青低温性能的改善效果会随着温度的下降而降低,在研究胶粉对沥青低温性能的影响程度时,弯曲梁流变试验的结果比低温延度试验的结果更加明显,且由于橡胶沥青的低温延度较小,试验过程中容易产生较大误差,因此,建议采用弯曲梁流变试验评价橡胶沥青的低温性能。
[Abstract]:In order to unify the evaluation index of rubber asphalt performance test, the base asphalt of 70# and 90# was modified with different rubber powder content, based on the penetration and ductility of Chinese specifications.The properties of rubber asphalt were evaluated by softening point and elastic recovery test, dynamic shear rheological test in Superpave, Brinell rotation viscosity test and bending beam rheological test.The results show that the addition of rubber powder can significantly improve the high temperature performance of asphalt, reduce the temperature sensitivity of asphalt, but increase the viscosity of asphalt at high temperature and increase the difficulty of mixing and compaction of asphalt mixture.The swelling effect of rubber powder will lead to great error in the test result of penetration degree. Therefore, it is not recommended to use penetration test to evaluate the performance of rubber asphalt, and the softening point can be used as an evaluation index of high temperature performance of rubber asphalt.The effect of rubber powder on softening point of 70# matrix asphalt is greater than that on 90# base asphalt, and the improvement effect of rubber powder on the low temperature performance of asphalt will decrease with the decrease of temperature.The result of rheological test of bending beam is more obvious than that of low temperature ductility test, and because the low temperature ductility of rubber asphalt is small, it is easy to produce large error in the test process.It is suggested that the low temperature performance of rubber asphalt should be evaluated by bending beam rheological test.
【作者单位】：长安大学道路结构与材料交通行业重点实验室;西北工业大学力学与土木建筑学院;山东大学材料科学与工程学院;密歇根理工大学土木工程与环境学院;
【基金】：国家自然科学基金项目(51378074) 交通运输部应用基础研究项目(2014 319 812 180)
【分类号】：U414

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