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Solubility parameters and bitumen

机译：溶解度参数和沥青

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A new bitumen model has been proposed. The model is a more complete mathematical description of the stability of bitumen in terms of three-dimensional solubility parameters. It could easily be visualised in a 3D diagram or a physical model. The model is based on the current knowledge of bitumen chemistry combined with investigations on the solubility parameters of the least soluble components of bitumen. For this purpose we have used turbidimetric titrations with three carefully selected titrants, iso-octane, 2-butanone and 2-ethyl-l-hexanol. The result is a stability space expressed in terms of Hansen solubility parameters. The model indicates that the stability of bitumen depends on the mutual solubility of all components of bitumen, a statement which is contradictory to the "old" ideas of bitumen consisting of a dispersion of asphaltene micelles. We have found that if the chemical environment in the bitumen is changed too much, there is a risk for precipitation of the least soluble component which means that the bitumen becomes unstable. We suggest that this is accompanied by a loss of functional properties of the binder. In this work we have shown that stability changes can go in different directions depending on the kind of process we are considering. Examples are ageing, oxidation, visbreaking, fluxing or blending bitumens. The new model permits us to predict bitumen stability and calculate its sensitivity for different kind of changes. From this, it follows that the model is a good tool for making a more proper choice of blending components. We believe that the new model could provide the base for a new description of bitumen, which could be used to better understand the performance properties.
机译：已经提出了一种新的沥青模型。该模型根据三维溶解度参数对沥青的稳定性进行了更完整的数学描述。它可以轻松地以3D图表或物理模型可视化。该模型基于沥青化学的当前知识，结合对沥青中最不溶解的组分的溶解度参数的研究。为此，我们使用了比浊滴定法，使用了三种精心选择的滴定剂：异辛烷，2-丁酮和2-乙基-1-己醇。结果是用汉森溶解度参数表示的稳定性空间。该模型表明沥青的稳定性取决于沥青所有组分的互溶性，这一说法与由沥青质胶束分散体组成的“古老”的沥青思想相矛盾。我们已经发现，如果沥青中的化学环境变化太大，则存在溶解度最低的组分沉淀的风险，这意味着沥青变得不稳定。我们建议这伴随着粘合剂功能性能的丧失。在这项工作中，我们表明，根据我们正在考虑的过程类型，稳定性变化可以朝不同的方向发展。例如老化，氧化，减粘，助熔或混合沥青。新模型允许我们预测沥青的稳定性，并计算其对各种变化的敏感性。由此可见，该模型是做出更适当混合成分选择的好工具。我们认为，新模型可以为沥青的新描述提供基础，从而可以更好地理解性能属性。

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