Su Jun-Feng, Yang Peng, Wang Ying-Yuan, Han Shan, Han Ning-Xu, Li Wei
Department of Polymer Materials, School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
School of Navigational Engineering, Guangzhou Maritime Institute, Guangzhou 510725, China.
Materials (Basel). 2016 Jul 21;9(7):600. doi: 10.3390/ma9070600.
The aim of this work was to evaluate the self-healing behaviors of bitumen using microcapsules containing rejuvenator by a modified fracture healing-refracture method through a repetitive tension test. Microcapsules had mean size values of 10, 20 and 30 μm with a same core/shell ratio of 1/1. Various microcapsules/bitumen samples were fabricated with microcapsule contents of 1.0, 3.0 and 5.0 wt. %, respectively. Tension strength values of microcapsules/bitumen samples were measured by a reparative fracture-healing process under different temperatures. It was found that these samples had tensile strength values larger than the data of pure bitumen samples under the same conditions after the four tensile fracture-healing cycles. Fracture morphology investigation and mechanism analysis indicated that the self-healing process was a process consisting of microcapsules being broken, penetrated and diffused. Moreover, the crack healing of bitumen can be considered as a viscosity driven process. The self-healing ability partly repaired the damage of bitumen during service life by comparing the properties of virgin and rejuvenated bitumen.
本研究旨在通过重复拉伸试验，采用改进的裂缝愈合-再断裂方法，评估含有再生剂的微胶囊对沥青自愈行为的影响。微胶囊的平均尺寸分别为10、20和30μm，核壳比均为1/1。制备了微胶囊含量分别为1.0、3.0和5.0 wt.%的各种微胶囊/沥青样品。通过在不同温度下的修复性裂缝愈合过程，测量了微胶囊/沥青样品的拉伸强度值。结果发现，经过四个拉伸断裂-愈合循环后，这些样品在相同条件下的拉伸强度值高于纯沥青样品的数据。裂缝形态研究和机理分析表明，自愈过程是一个微胶囊破裂、渗透和扩散的过程。此外，沥青的裂缝愈合可视为一个粘度驱动的过程。通过比较原始沥青和再生沥青的性能，自愈能力在一定程度上修复了沥青在使用寿命期间的损伤。
