多种类沥青及复合改性材料常规-流变性能相关性分析

2021-04-27 19:06:35林楠郭锋赵兴寨
粘接 2021年7期

林楠 郭锋 赵兴寨

摘 要:通过试验研究胶粉改性沥青、SBS改性沥青及混合改性沥青微观组织结构、高温环境与低温环境对其流变性能影响。测试结果表明:胶粉改性沥青、SBS改性剂与沥青相容性较好,但橡胶粉改性沥青与石材之间界面附着力高于SBS改性沥青。DSR试验表明:橡胶粉改性沥青温度具备低温耐裂性及高温耐变形性。综上对混合改性沥青流变性能研究,旨在为我国研发新型高性能沥青提供有效技术支持。

关键词:混合改性沥青;高低温环境;流变性能;胶粉改性沥青;耐变形性

中图分类号:TM912                           文献标识码:A                         文章编号:1001-5922(2021)07-0050-04

Correlation Analysis of Conventional Rheological Properties of Various Kinds of Asphalt and Composite Modified Materials

Lin Nan1, Guo Feng2, Zhao Xingzhai1

(1.Xi an Railway Vocational and Technical College, Xi an 710600, China;

2.Shaanxi Deli Engineering Design Co., Ltd.,Xi an 710000 ,China)

Abstract:The effects of microstructure, high temperature environment and low temperature environment on rheological properties of crumb rubber modified asphalt, SBS modified asphalt and mixed modified asphalt were studied. The test results show that rubber powder modified asphalt and SBS modifier have good coMPatibility with asphalt, but the interfacial adhesion between rubber powder modified asphalt and stone is higher than SBS modified asphalt. DSR test shows that rubber powder modified asphalt has low temperature crack resistance and high temperature deformation resistance. In conclusion, the research on rheological properties of mixed modified asphalt aims to provide effective technical support for the research and development of new high-performance asphalt in China.

Key words:mixed modified asphalt; high and low temperature environment; rheological properties; crumb rubber modified asphalt; deformation resistance

0 引言

瀝青混凝土路面在我国主要用于高级别公路,我国北方夏季与冬季温差较大,由于沥青对温度具有较强敏感性,因此沥青路面损坏现象,如夏季的车辙和冬季的脆性开裂等,已逐渐引起道路维修部门重视。目前,我国迫切需要找到具有良好低温抗裂性与高温抗变形性的沥青材料。沥青及其混合物视为代表性粘弹性材料,其机械性能在沥青路面使用中发挥重要作用。

石油沥青与煤焦油沥青相比,前者更具有较低分子量与分布广泛等特性,其机械性能对温度更具敏感性、低温环境易发生脆裂、高温环境易流动、弹性性能极差、并且抗老性能较差,上述原因对石油沥青应用范围存在约束条件。煤焦油沥青具备极高软化点,其对矿物颗粒具有良好附着力。如果将其直接与石油沥青融合使用,则会减弱石油沥青蠕变性能及低温抗裂性。……

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