Wu Bangwei, Meng Weijie, Xia Ji, Xiao Peng
College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225127, China.
Research Center for Basalt Fiber Composite Construction Materials, Yangzhou University, Yangzhou 225127, China.
Materials (Basel). 2022 Jan 19;15(3):744. doi: 10.3390/ma15030744.
The paper aims to investigate the influence of basalt fiber (BF) on the crack resistance of the asphalt mixture and conduct a mechanical analysis. First, two typical asphalt mixtures, namely AC-13 and SMA-13, were designed. The impact of BF on the mixture design results was analyzed. Then, several macroscopic tests, namely the four-point bending test, indirect tensile test, and semicircular bending test (SCB), were conducted to assess the effect of BF on the cracking resistance of asphalt mixtures. Finally, the influence of BF on the cracking resistance of asphalt mixtures was analyzed based on an environmental scanning electron microscope (ESEM) observation. The results show that: (1) BF increases the optimal asphalt content of AC13 and decreases the optimal asphalt content of SMA-13, which is caused by the different asphalt-absorption capacity of BF and lignin fiber (LF). (2) BF enhances both the fatigue crack resistance and temperature crack resistance of asphalt mixtures. The enhancement on the SMA-13 is more significant, indicating that the enhancement of BF on asphalt mixtures is related to the type of aggregate gradation. (3) BFs in the asphalt mixture lap each other to form a spatial network structure. Such structure can effectively improve the crack resistance of the mixture by dispersing the load stress and preventing the flow of asphalt mastic. The study results provide an effective method to design crack-resistant asphalt mixtures.
本文旨在研究玄武岩纤维（BF）对沥青混合料抗裂性能的影响并进行力学分析。首先，设计了两种典型的沥青混合料，即AC - 13和SMA - 13，分析了玄武岩纤维对混合料设计结果的影响。然后，进行了多项宏观试验，即四点弯曲试验、间接拉伸试验和半圆弯曲试验（SCB），以评估玄武岩纤维对沥青混合料抗裂性能的影响。最后，基于环境扫描电子显微镜（ESEM）观察分析了玄武岩纤维对沥青混合料抗裂性能的影响。结果表明：（1）玄武岩纤维增加了AC13的最佳沥青用量，降低了SMA - 13的最佳沥青用量，这是由玄武岩纤维和木质素纤维（LF）不同的沥青吸收能力所致。（2）玄武岩纤维增强了沥青混合料的抗疲劳开裂性能和抗温度开裂性能。对SMA - 13的增强作用更显著，表明玄武岩纤维对沥青混合料的增强作用与集料级配类型有关。（3）沥青混合料中的玄武岩纤维相互搭接形成空间网络结构。这种结构可通过分散荷载应力和防止沥青玛蹄脂流动有效地提高混合料的抗裂性能。研究结果为设计抗裂沥青混合料提供了一种有效方法。
