Jasso Martin, Perez Jaimes Juan Sebastian, Tellez Vega Esteban Felipe
Bituminous Materials Chair, Department of Civil Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada.
Materials (Basel). 2023 Oct 10;16(20):6631. doi: 10.3390/ma16206631.
The new class of reactive polymers is designed to modify asphalt through chemical reactions with asphalt components. The complexity of such systems and the long experience with thermoplastic elastomers as well as with some other "classical" modifiers, and to a degree that our present testing methods and even specifications revolve around these materials, might obscure the fact that we are dealing with rather different modification systems and possibly with new emerging asphalt paving technologies. Our present work attempted to compare two different reactive polymer systems with the "classical" system which uses thermoplastic elastomer. The impact of reactive polymer systems on asphalt was studied through material properties manifested by specification tests and through the development of thermo-rheological properties in linear and non-linear viscoelastic regions. As expected, the behavior of reactive polymeric systems with different chemistries also differed among themselves. The available results showed that the reactive groups of polymers react with polar components of asphalt leading to higher stiffness at elevated pavement temperatures and differing impact on low temperature properties. The data point to a significantly improved resistance to plastic deformation of pavement in the case of reactive polymers, despite the fact that elastic recovery-based specification tests failed to identify this improvement.
新型反应性聚合物旨在通过与沥青成分发生化学反应来改性沥青。这类体系的复杂性，以及热塑性弹性体和其他一些“经典”改性剂的长期使用经验，甚至在某种程度上我们目前的测试方法以及规范都是围绕这些材料展开的，这可能会掩盖一个事实，即我们正在处理的是相当不同的改性体系，并且可能涉及新兴的沥青路面技术。我们目前的工作试图将两种不同的反应性聚合物体系与使用热塑性弹性体的“经典”体系进行比较。通过规范测试所体现的材料性能以及线性和非线性粘弹性区域内热流变性能的发展，研究了反应性聚合物体系对沥青的影响。正如预期的那样，具有不同化学性质的反应性聚合物体系之间的行为也有所不同。现有结果表明，聚合物的反应基团与沥青的极性成分发生反应，导致路面温度升高时刚度更高，并且对低温性能的影响也不同。数据表明，尽管基于弹性恢复的规范测试未能识别出这种改进，但在使用反应性聚合物的情况下，路面的抗塑性变形能力有显著提高。
