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EBBR试验下沥青结合料低温性能评价指标

冯德成 崔世彤 易军艳 王东升

冯德成, 崔世彤, 易军艳, 王东升. EBBR试验下沥青结合料低温性能评价指标[J]. 交通运输工程学报, 2021, 21(5): 94-103. doi: 10.19818/j.cnki.1671-1637.2021.05.008
引用本文: 冯德成, 崔世彤, 易军艳, 王东升. EBBR试验下沥青结合料低温性能评价指标[J]. 交通运输工程学报, 2021, 21(5): 94-103. doi: 10.19818/j.cnki.1671-1637.2021.05.008
FENG De-cheng, CUI Shi-tong, YI Jun-yan, WANG Dong-sheng. Low temperature performance evaluation indexes of asphalt binder based on EBBR test[J]. Journal of Traffic and Transportation Engineering, 2021, 21(5): 94-103. doi: 10.19818/j.cnki.1671-1637.2021.05.008
Citation: FENG De-cheng, CUI Shi-tong, YI Jun-yan, WANG Dong-sheng. Low temperature performance evaluation indexes of asphalt binder based on EBBR test[J]. Journal of Traffic and Transportation Engineering, 2021, 21(5): 94-103. doi: 10.19818/j.cnki.1671-1637.2021.05.008

EBBR试验下沥青结合料低温性能评价指标

doi: 10.19818/j.cnki.1671-1637.2021.05.008
基金项目: 

国家自然科学基金项目 51878229

详细信息
    作者简介:

    冯德成(1967-), 男, 河南新县人, 哈尔滨工业大学教授, 工学博士,从事路面材料与结构研究

  • 中图分类号: U416.217

Low temperature performance evaluation indexes of asphalt binder based on EBBR test

Funds: 

National Natural Science Foundation of China 51878229

More Information
  • 摘要: 聚焦沥青结合料低温性能评价指标,基于流变学的弯曲梁流变仪试验、改进弯曲梁流变仪试验,分别分析了实际路面回收沥青、老化后的基质沥青、改性沥青低温流变性能规律;利用传统劲度模量及模量变化率指标展开了沥青的低温性能评价,提出了等效低温设计温度指标与温度差异值指标;在不同养护环境下进行模拟,利用低温等级损失指标对新制备、回收沥青展开了低温物理硬化影响因素研究;利用不同来源、不同品种沥青试验结果相互验证,从抗干扰能力、稳定性、评价准确度、直观性与指标获取难易程度等方面对上述指标进行分析,确立了4类指标对沥青低温性能的区分与评价能力。研究结果表明:回收沥青的实验室流变分析能够反映路面结构的低温抗裂水平,开裂严重路段沥青的模量明显高于其他路段,其数值差异可达130 MPa;新制备的SBS改性沥青与回收沥青低温加载规律一致性高,模量偏差低于15%,可有效搭建起实验室研究同实际路面病害处理需要的关系;传统指标数据稳定性偏弱,置信度仅为64.7%~82.3%,难以满足研究需要,温度差异值指标及低温等级损失指标在应用方面同样受到制约,对此仍需开展更多深入的研究。

     

  • 图  1  各老化状态下PG低温等级

    Figure  1.  Low temperature grades of PG in various aging states

    图  2  EBBR养护加载条件

    Figure  2.  EBBR maintenance loading conditions

    图  3  EBBR试验养护过程

    Figure  3.  EBBR test maintenance process

    图  4  回收沥青劲度模量及其变化率

    Figure  4.  Stiffness moduli of extracted asphalt and its changing rates

    图  5  新制备沥青劲度模量变化规律

    Figure  5.  Variation rules of stiffness modulus of newly prepared asphalt

    图  6  新制备沥青劲度模量变化率规律

    Figure  6.  Changing rate rules of stiffness modulus of newly prepared asphalt

    图  7  新制备沥青等效低温等级分布

    Figure  7.  Equivalent low temperature grade distributions of newly prepared asphalts

    图  8  新制备沥青的ΔTc

    Figure  8.  ΔTc of newly prepared asphalt

    图  9  回收沥青的低温等级损失

    Figure  9.  Low temperature grade losses of extracted asphalts

    图  10  新制备沥青的低温等级损失

    Figure  10.  Low temperature grade losses of newly prepared asphalts

    表  1  新制备沥青老化前后针入度及软化点

    Table  1.   Penetrations and softening points of newly prepared asphalt before and after aging

    沥青品种 针入度/0.1 mm 软化点/℃
    老化前 老化后 老化前 老化后
    盘锦70# 62.4 55.5 49.5 69.8
    大连70# 77.3 48.7 49.7 54.3
    中大90# 86.3 80.2 45.3 56.2
    SBS改性 75.6 55.5 75.0 69.8
    橡胶粉改性 58.6 43.1 75.8 79.9
    SBS橡胶 54.0 22.4 81.6 89.7
    下载: 导出CSV

    表  2  新制备沥青分类

    Table  2.   Newly prepared asphalt classification

    沥青品种 未老化 短期老化 紫外老化 压力老化
    盘锦70# P70- P70-T P70-Z P70-P
    大连70# D70- D70-T D70-Z D70-P
    中大90# Z90- Z90-T Z90-Z Z90-P
    SBS改性 SBS- SBS-T SBS-Z SBS-P
    橡胶粉改性 R- R-T R-Z R-P
    SBS橡胶 SR- SR-T SR-Z SR-P
    下载: 导出CSV

    表  3  回收沥青的当量低温设计温度

    Table  3.   Equivalent low temperature design temperatures of extracted asphalt

    开裂间距/m 5~10 10~20 20~30 30~50
    Tdx/℃ -23.3 -23.6 -26.1 -27.8
    下载: 导出CSV

    表  4  回收沥青的ΔTc

    Table  4.   ΔTc of extracted asphalt

    开裂间距/m 5~10 10~20 20~30 30~50
    ΔTc/℃ 3.2 3.4 0.5 -0.8
    下载: 导出CSV
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  • 收稿日期:  2021-05-09
  • 网络出版日期:  2021-11-13
  • 刊出日期:  2021-10-01

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