Asphalt modified by styrene-butadiene-styrene triblock copolymer: Morphology and model
Asphalt modified by styrene-butadiene-styrene triblock copolymer: Morphology and model
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DOI：
10.1061/(asce)0899-1561(2002)14:3(224
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发表时间：
2002-05-01
影响因子：
3.2
通讯作者：
Shiah, MS
中科院分区：
文献类型：
--
作者：
Chen, JS;Liao, MC;Shiah, MS
采用苯乙烯-丁二烯-苯乙烯（SBS）三嵌段共聚物对沥青粘结剂进行改性。采用透射电子显微镜（TEM）、旋转粘度计和动态剪切流变仪对粘合剂的形貌和工程性能进行了研究。通过SBS浓度和共聚物微观结构的存在来描述聚合物改性沥青的形态。随着SBS浓度的增加，共聚物逐渐成为主导相，SBS改性沥青的工程性能随之发生变化。透射电镜结果表明，根据沥青和共聚物来源的不同，可以发现多种形态的共聚物。SBS改性的粘结剂可能表现为连续的沥青相和分散的SBS颗粒，或连续的聚合物相和分散的沥青球，或两个互锁的连续相。根据沥青与聚合物之间形成的临界网络，确定了SBS的最佳含量。由于这种网络的形成，粘合剂显示出复合模量的大幅增加，这表明抗车辙。在低SBS浓度下，发现Kerner模型适合于估计SBS改性沥青的神学性质。本文提出了一个改进的Kerner方程来预测高SBS浓度下改性沥青的复合模量。
The styrene-butadiene-styrene (SBS) triblock copolymer was used to modify the asphalt binder. The morphology and engineering properties of the binders were investigated using transmission electron microscopy (TEM), rotational viscometer, and dynamic shear rheometer. The morphology of polymer-modified asphalt was described by the SBS concentration and the presence of microstructure of the copolymer. When the SBS concentration increased, the copolymer gradually became the dominant phase, and the transition was followed by a change in engineering properties of SBS-modified asphalt. Results from TEM showed that depending on the asphalt and copolymer source, a variety of morphology can be found. The SBS-modified binders might show a continuous asphalt phase with dispersed SBS particles, a continuous polymer phase with dispersed asphalt globules, or two interlocked continuous phases. The optimum SBS content was determined based on the formation of the critical network between asphalt and polymer. Because of this network formation, the binders showed a large increase in the complex modulus that indicates resistance to rutting. At low SBS concentrations, the Kerner model was found to be appropriate to estimate the theological properties of SBS-modified asphalt. An adapted Kerner equation was proposed in this study to predict the complex modulus of modified asphalt at high SBS concentrations.