Abstract

To delay the expansion of reflective cracks on semi-rigid base asphalt pavements and strengthen the cracking resistance of asphalt rubber stress-absorbing membrane interlayers, the bonding and fracture performances as well as cracking resistance of a fiber-reinforced asphalt rubber stress-absorbing membrane interlayer (FAR-SAMI), rubber asphalt stress-absorbing membrane interlayer (AR-SAMI), and SBS-modified asphalt stress-absorbing membrane interlayer (AS-SAMI) were studied. In addition, the resistance to reflective cracking for FAR-SAMI was evaluated by finite element (FE) analysis. The results show that FAR-SAMI exhibits appropriate bonding performance at 15$$ and 40$°C.$ The addition of glass fiber increases the toughness of the composite specimens and the fracture energy of FAR-SAMI increases by 23% compared with AR-SAMI. Furthermore, FAR-SAMI is effective in restraining the development of reflection cracks and prolonging the fatigue life. FE analysis also shows that FAR-SAMI can significantly reduce the stress concentration phenomenon in the crack. Therefore, fiber-reinforced asphalt rubber was found to be suitable as a SAMI to prevent and control reflective cracking.

摘要

延缓半刚性基层沥青路面反射裂缝的扩展，增强沥青橡胶应力吸收膜夹层的抗裂性能，提高纤维增强沥青橡胶应力吸收膜夹层的粘结断裂性能和抗裂性能（FAR-SAMI）、橡胶沥青应力吸收膜夹层（AR-SAMI）和SBS改性沥青应力吸收膜夹层（AS-SAMI）。此外，通过有限元 (FE) 分析评估了 FAR-SAMI 的抗反射开裂能力。结果表明 FAR-SAMI 在 15$$ 和 40$°C.$玻璃纤维的加入提高了复合材料试样的韧性，FAR-SAMI的断裂能比AR-SAMI提高了23%。此外，FAR-SAMI 在抑制反射裂纹的发展和延长疲劳寿命方面是有效的。有限元分析还表明，FAR-SAMI 可以显着减少裂纹中的应力集中现象。因此，发现纤维增强沥青橡胶适合作为 SAMI 来预防和控制反射裂缝。