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Impact of maltene and asphaltene fraction on mechanical behavior and microstructure of bitumen

机译：麦芽和沥青质馏分对沥青力学行为和微观结构的影响

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摘要

As a widely accepted concept, bitumen consists of four fractions that can be distinguished by their polarity. Highly polar asphaltene micelles are dispersed in a viscous phase of saturates, aromatics and resins (maltene phase). Different concentrations of asphaltenes in the bitumen result in a range of mechanical response properties. In an interdisciplinary study the impact of the maltene phase and asphaltenes on the linear viscoelastic behavior and the microstructure of bitumen were analyzed by creep recovery testing in a DSR and by atomic force microscopy (AFM). Therefore, bitumen was separated into the maltene and asphaltene fractions and artificial bitumen samples with different, pre-defined asphaltene concentrations were produced and investigated. It was found that the artificially produced, precipitated bitumen samples can be regarded as a representative, bitumen-like material in terms of mechanical behavior and microstructure. Asphaltenes play an important role in the typical viscoelastic behavior of bitumen being mainly responsible for stiffness and elasticity. Also, their concentration appears to be correlated to the occurrence and shape of the bee-like inclusions which can be typically observed by AFM.
机译：作为一个被广泛接受的概念，沥青由四个可通过极性区分的馏分组成。高极性沥青质胶束分散在饱和物，芳烃和树脂的粘稠相（麦芽烯相）中。沥青中不同浓度的沥青质会导致一系列机械响应特性。在一项跨学科研究中，通过DSR中的蠕变恢复测试和原子力显微镜（AFM）分析了麦烯相和沥青质对线性粘弹性行为和沥青微观结构的影响。因此，将沥青分离为麦芽和沥青质馏分，并生产和研究了具有不同的预定沥青质浓度的人造沥青样品。已经发现，就机械性能和微观结构而言，人工生产的沉淀沥青样品可被视为代表性的沥青状材料。沥青在沥青的典型粘弹性行为中起着重要作用，主要起着刚性和弹性的作用。而且，它们的浓度似乎与蜜蜂状夹杂物的出现和形状有关，通常可以通过原子力显微镜观察到。

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  • 来源
    《Materials and structures》 |2016年第3期|829-841|共13页
  • 作者

    Hofko B.; Eberhardsteiner L.; Fuessl J.; Grothe H.; Handle F.; Hospodka M.; Grossegger D.; Nahar S. N.; Schmets A. J. M.; Scarpas A.;

  • 作者单位

    Vienna Univ Technol, Karlspl 13, A-1040 Vienna, Austria;

    Vienna Univ Technol, Karlspl 13, A-1040 Vienna, Austria;

    Vienna Univ Technol, Karlspl 13, A-1040 Vienna, Austria;

    Vienna Univ Technol, Karlspl 13, A-1040 Vienna, Austria;

    Vienna Univ Technol, Karlspl 13, A-1040 Vienna, Austria;

    Vienna Univ Technol, Karlspl 13, A-1040 Vienna, Austria;

    Vienna Univ Technol, Karlspl 13, A-1040 Vienna, Austria;

    Delft Univ Technol, Sect Rd & Railway Engn, Fac Civil Engn & Geosci, Stevinweg 1, NL-2628 CN Delft, Netherlands;

    Delft Univ Technol, Sect Rd & Railway Engn, Fac Civil Engn & Geosci, Stevinweg 1, NL-2628 CN Delft, Netherlands;

    Delft Univ Technol, Sect Rd & Railway Engn, Fac Civil Engn & Geosci, Stevinweg 1, NL-2628 CN Delft, Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Bitumen composition; DSR; AFM; Maltene; Asphaltene; Microstructure;

    机译：沥青组成;DSR;AFM;茂金属;沥青质;微观结构;

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