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Physico-chemical analysis of five hard bitumens: Identification of chemical species and molecular organization before and after artificial aging

机译：五个硬沥青的理化分析：人工老化前后的化学物种和分子组织的鉴定

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摘要

The present paper focuses on a physico-chemical analysis of five different types of bitumens, both before and after aging. These bitumen samples were chosen based on: the original crude oil (straight-run bitumens with different asphaltene and crystallized fraction contents), mode of refining (straight-run vs. half-blown bitumen), and modifier characteristics (straight-run vs. polyphosphoric acid (PPA)-modified bitumen). The aim of this study is to determine both the aging effect on chemical species and the chemical organization as a function of the type of bitumen sample.rnIn order to obtain information on bitumen chemistry, n-heptane precipitation (Standard NF EN 12591), IATROSCAN chromatography (coupling between a thin-layer liquid chromatography on a silica gel and a flame ionization detector), FTIR spectroscopy and differential scanning calorimetry (DSC) have all been used. Size exclusion chromatography under "high-speed" conditions (HS-SEC), which yields information relative to asphaltene associations, was also introduced. Several years of road aging were simulated through 25 h of a pressure aging vessel (PAV) testrnThe coupling of IATROSCAN chromatography and n-heptane precipitation made it possible to identify and quantify polar resins.rnIn accordance with previous studies, the use of HS-SEC combined with IATROSCAN chromatography indicates that a modification by PPA leads to an increase in asphaltene content and a more dispersed asphaltene structure than that found in pure bitumen. This same conclusion can be drawn from observations of the half-blown bitumen sample. The half-blown bitumen actually contains less asphaltene than one of the straight-run bitumens in the study; furthermore, its asphaltenes are more highly agglomerated. These results demonstrate that asphaltene association does not systematically depend on quantity alone, as its chemical type also enters into play. Moreover, during aging, even though asphaltene content is increasing for all bitumen samples, its agglomeration is still highly dependent on the type of bitumen. It would therefore appear that the presence of crystallized fractions exerts a major influence on this process.
机译：本文着重于老化前后五种不同类型的沥青的理化分析。选择这些沥青样品的依据是：原始原油（具有不同沥青质和结晶馏分含量的直馏沥青），精炼方式（直馏vs.半吹制沥青）和改性剂特性（直馏vs.沥青）。多磷酸（PPA）改性沥青）。这项研究的目的是确定老化对化学物种的影响以及化学组织与沥青样品类型的关系.rn为了获得有关沥青化学的信息，正庚烷沉淀（标准NF EN 12591），IATROSCAN色谱（硅胶上的薄层液相色谱和火焰离子检测器之间的耦合），FTIR光谱和差示扫描量热法（DSC）已全部使用。还介绍了在“高速”条件下进行尺寸排阻色谱（HS-SEC）的方法，该方法可获得有关沥青质缔合的信息。通过25小时的压力老化容器（PAV）测试模拟了数年的道路老化。IATROSCAN色谱法与正庚烷沉淀的耦合使鉴定和定量极性树脂成为可能。rn根据以前的研究，HS-SEC的使用与IATROSCAN色谱法结合使用表明，与纯沥青相比，PPA进行的改性可导致沥青质含量的增加和沥青质结构的分散。可以从对半吹制沥青样品的观察中得出相同的结论。实际上，半吹散的沥青所含沥青质比本研究中的一种直馏沥青要少。此外，其沥青质的团聚程度更高。这些结果表明，沥青质的缔合并不系统地依赖于数量，因为其化学类型也起作用。而且，在老化过程中，即使所有沥青样品的沥青质含量都在增加，但其团聚仍高度依赖于沥青的类型。因此，似乎结晶级分的存在对该过程产生了重大影响。

著录项

  • 来源
    《Fuel》 |2010年第11期|P.3330-3339|共10页
  • 作者

    M. Le Guern; E. Chailleux; F. Farcas; S. Dreessen; I. Mabille;

  • 作者单位

    Laboratoire Central des Ponts et Chaussees, Route de Bouaye, BP 4129, 44341 Bouguenais, France;

    rnLaboratoire Central des Ponts et Chaussees, Route de Bouaye, BP 4129, 44341 Bouguenais, France;

    rnDivision Physko-chimie des materiaux, Laboratoire Central des Ponts et Chaussees, 58 boulevard Lefebvre, 75732 Paris Cedex 15, France;

    rnCentre de Recherche de TOTAL, BP 22, Chemin du Canal, 69360 Solaize, France;

    rnLaboratoire de Genie des Procedes Plasmas et Traitement de Surfaces, UPMC/ENSCP - EA 3492, Ecole Nationale Superieure de Chimie de Paris,11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France;

  • 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; size exclusion chromatography; asphaltene structure;

    机译：沥青;尺寸排阻色谱法;沥青质结构;

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