Ortega Francisco José, Cuadri Antonio Abad, Partal Pedro, Navarro Francisco Javier
Pro2TecS-Chemical Process and Product Technology Research Centre, Department of Chemical Engineeing, ETSI, Campus de "El Carmen", University of Huelva, 21071 Huelva, Spain.
Polymers (Basel). 2022 Jun 16;14(12):2437. doi: 10.3390/polym14122437.
The softening of aged bitumen is necessary for a successful asphalt rejuvenation in road recycling operations. Thus, this study proposes a novel and successful approach by using Dodecenyl Succinic Anhydride (DSA), a reactive surfactant with a polar head capable of reacting with some polar compounds of bitumen. On this basis, this paper analyses the softening potential and ageing inhibition capability of the addition of 3 wt.% DSA before and after the application of standard laboratory ageing methods (rolling thin film oven, RTFOT and pressure aging vessel (PAV) tests). To that end, different modified bitumens were evaluated by analysing the linear viscoelastic behaviour, viscous flow properties, thin layer chromatography, Fourier transform infrared spectroscopy (FTIR), contact angle measurements and compactibility tests. The results obtained for DSA show its greater potential to soften a model bitumen, when compared to a diluent oil, through physico-chemical processes that bring about a lowering in the polarity along with the alteration of its colloidal stability. Even though ageing processes in bitumen negatively affect its softening capacity, the developed structures still retain the ability to partially compensate for the adverse hardening effects. Furthermore, DSA addition greatly enhances the binder's wettability on a siliceous-type aggregate and favours asphalt compaction.
在道路再生作业中，老化沥青的软化对于成功实现沥青再生至关重要。因此，本研究提出了一种新颖且成功的方法，即使用十二碳烯基琥珀酸酐（DSA），一种具有极性头部的反应性表面活性剂，能够与沥青中的一些极性化合物发生反应。在此基础上，本文分析了在应用标准实验室老化方法（旋转薄膜烘箱试验，RTFOT和压力老化容器试验，PAV）前后添加3 wt.% DSA的软化潜力和抗老化能力。为此，通过分析线性粘弹性行为、粘性流动特性、薄层色谱、傅里叶变换红外光谱（FTIR）、接触角测量和压实性能测试，对不同的改性沥青进行了评估。与稀释油相比，DSA的测试结果表明，它通过物理化学过程降低极性并改变其胶体稳定性，从而具有更大的软化模型沥青的潜力。尽管沥青的老化过程会对其软化能力产生负面影响，但形成的结构仍保留了部分补偿不利硬化效应的能力。此外，添加DSA极大地提高了粘结剂在硅质型集料上的润湿性，并有利于沥青压实。
