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Polymer modified bitumen

机译:聚合物改性沥青

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摘要

Standard methods of characterisation of bitumen (BIT) and polymer modified bitumen (PMB) do not provide sufficient information. We propose to rely on determination of rheological properties which are much more informative. Along theses lines, we have determined rheology before and after the rolling thin film oven test. The materials studied were BIT, BIT+linear (L), styrene?butadiene?styrene (SBS), block copolymer, BIT+radial (R) and SBS copolymer. The rheological properties of the modified binders are characterised using a dynamic shear rheometer, over wide ranges of temperatures at a fixed traffic frequency of 10 rad s?1. The SBS block copolymers increase the elasticity of the BIT at high temperatures and contribute to a better flexibility at low temperatures. Polymer modified bitumens have higher resistance to permanent deformation. After aging, the hardening of BIT and PMBs occurred and the elastic response decreases as a consequence of degradation. The determined rheological properties are in agreement with the results of conventional tests.
机译:沥青(BIT)和聚合物改性沥青(PMB)表征的标准方法无法提供足够的信息。我们建议依靠对流变学特性的测定来提供更多信息。沿着这些思路,我们已经确定了滚动薄膜烘箱测试前后的流变性。研究的材料是BIT,BIT +线性(L),苯乙烯-丁二烯-苯乙烯(SBS),嵌段共聚物,BIT +径向(R)和SBS共聚物。使用动态剪切流变仪,在10 rad s?1的固定交通频率下,在较宽的温度范围内,对改性粘合剂的流变特性进行了表征。 SBS嵌段共聚物可提高BIT在高温下的弹性,并有助于在低温下具有更好的柔韧性。聚合物改性的沥青具有更高的抗永久变形能力。老化后,BIT和PMB发生硬化,并且弹性反应由于降解而降低。所确定的流变性质与常规测试的结果一致。

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