Lv Songtao, Ge Dongdong, Cao Shihao, Liu Dingyuan, Zhang Wenhui, Li Cheng-Hui, Cabrera Milkos Borges
School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China.
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
Polymers (Basel). 2024 Sep 30;16(19):2782. doi: 10.3390/polym16192782.
Fatigue performance and self-repairing activity of asphalt binders are two properties that highly influence the fatigue cracking response of asphalt pavement. There are still numerous gaps in knowledge to fill linked with these two characteristics. For instance, current parameters fail to accommodate these two bitumen phenomena fully. This study aims to propose a new procedure to address this issue utilizing the linear amplitude sweep (LAS) test, LAS with rest period (RP) (LASH) test, and simplified viscoelastic continuum damage (S-VECD) model. This research work used four different types of asphalt binders: neat asphalt (NA), self-healing thermoplastic polyurethane (STPU)-modified bitumen (STPB), self-healing poly (dimethyl siloxane) crosslinked with urea bond (IPA1w)-modified bitumen (IPAB), and styrene-butadiene-styrene (SBS)-modified bitumen (SBSB). Before the testing process, all the materials were subjected to short-term and long-term aging. The new procedure showed a superior capacity to analyze and accommodate all bitumen fatigue performances and self-repairing activities compared to the current method. Another finding proved that asphalt binders with a higher self-restoration behavior failed to show a better fatigue performance. Moreover, the higher fatigue performance increments produced by STPU and IPA1w in NA concerning the control bitumen were 123.7% and 143.7%, respectively. Those values were obtained with 1.0% STPU and 0.5% IPA1w in NA. A breakthrough finding demonstrated that asphalt binder fatigue response is augmented when the RP was applied at a higher damage intensity () value. STPB and IPAB reached their highest increments of fatigue response, containing 1.0% of STPU and 0.5% of IPA1w, respectively. Those augmentations were 207.54% and 232.64%, respectively.
沥青结合料的疲劳性能和自修复活性是对沥青路面疲劳开裂响应有重大影响的两个特性。在与这两个特性相关的知识方面仍存在许多空白有待填补。例如，目前的参数未能充分考虑这两种沥青现象。本研究旨在提出一种新方法，利用线性振幅扫描（LAS）试验、带休息期的线性振幅扫描（LASH）试验和简化粘弹性连续损伤（S-VECD）模型来解决这一问题。本研究工作使用了四种不同类型的沥青结合料：纯沥青（NA）、自修复热塑性聚氨酯（STPU）改性沥青（STPB）、通过脲键交联的自修复聚二甲基硅氧烷（IPA1w）改性沥青（IPAB）和苯乙烯-丁二烯-苯乙烯（SBS）改性沥青（SBSB）。在测试过程之前，所有材料都进行了短期和长期老化。与当前方法相比，新方法在分析和考虑所有沥青疲劳性能和自修复活性方面具有更强的能力。另一个发现证明，具有较高自修复性能的沥青结合料并未表现出更好的疲劳性能。此外，在NA中相对于对照沥青，STPU和IPA1w产生的更高疲劳性能增量分别为123.7%和143.7%。这些值是在NA中含有1.0%的STPU和0.5%的IPA1w时获得的。一个突破性的发现表明，当在更高的损伤强度（）值下应用休息期时，沥青结合料的疲劳响应会增强。STPB和IPAB分别达到了它们疲劳响应的最高增量，分别含有1.0%的STPU和0.5%的IPA1w。这些增量分别为207.54%和232.64%。
