| 摘要: |
| 通过多应力蠕变恢复（MSCR）试验,分析了3种高性能改性沥青（A、B、C沥青）和SBS改性沥青（D沥青）的不可恢复蠕变柔量（Jnr）、蠕变恢复率（R）及相应的应力敏感性指标;通过室内车辙试验和动态蠕变试验,分析了4种改性沥青混合料的高温抗变形性能指标及其相关性.结果表明：与B、D沥青相比,A、C沥青在不同应力条件下的Jnr值较小，R值较大,对应力的敏感程度较低;A、C沥青混合料的高温性能要明显优于B、D沥青混合料;相较于室内车辙试验,动态蠕变试验与改性沥青Jnr、R之间的相关性更好;使用高应力（32、64、128kPa）条件下MSCR试验获取的Jnr及R值来评价改性沥青混合料的高温性能较为合理;A、C沥青的应用可以显著提升钢桥面铺装磨耗层的高温稳定性. |
| 关键词: 改性沥青 高温性能 多应力蠕变恢复试验 相关性分析 钢桥面铺装 |
| DOI：103969/j.issn.1007 9629202104022 |
| 分类号: |
| 基金项目:江苏省交通运输科技项目（2016Y01） |
|
| Analysis on the Key Indicators of High Temperature Performance of Modified Asphalts Commonly Used in Steel Bridge Deck Pavement |
|
DING Zihao1, NI Fujian1, LI Song1, JIANG Jiwang1, LU Yongqiang2
|
|
1.School of Transportation, Southeast University, Nanjing 211189, China;2.Zhejiang Jiashao Cross River Bridge Investment and Development Co., Ltd., Shaoxing 312000, China
|
| Abstract: |
| High temperature performance of three high performance modified asphalts(A, B and C) and SBS modified asphalt were characterized by multiple stress creep recovery(MSCR) test. Their non recoverable creep compliance(Jnr), percent recovery(R) and the corresponding stress sensitivity indexes were analyzed. The high temperature performance of asphalt mixtures fabricated by those four asphalt binders were evaluated through wheel tracking tests and dynamic creep tests. Ultimately, regression analyses were carried out between high temperature performance parameters of asphalt binder and asphalt mixture. The results show that the Jnr of A and C is comparatively smaller and percent recovery is bigger than SBS modified asphalt and B under different stresses. In addition, the stress sensitivity of A and C is lower than that of B and SBS modified asphalt. Furthermore, the high temperature rutting resistance of A mixture and C mixture is superior to the other two asphalt mixtures. Comparing with tracking tests, the dynamic creep tests show better correlation with Jnr and R. It is more reasonable to use Jnr and R of asphalt binders at 32, 64and 128kPa to evaluate the high temperature performance of modified asphalt mixtures. The application of A and C could improve the high temperature stability performance of steel bridge deck pavement dramatically. |
| Key words: modified asphalt high temperature performance multiple stress creep recovery(MSCR) test correlation analysis steel bridge deck pavement |
