Lou Keke, Jia Silin, Xiao Peng, Wu Haochen, Wu Yuhao
College of Civil Science and Engineering, Yangzhou University, Yangzhou 225100, China.
Research Center for Basalt Fiber Composite Construction Materials, Yangzhou 225127, China.
Materials (Basel). 2024 Dec 26;18(1):53. doi: 10.3390/ma18010053.
The interfacial properties of fiber asphalt aggregate and the cracking resistance of asphalt mixture are directly affected by moisture infiltration. In order to investigate the correlation between interfacial properties and immersion stability of asphalt mixture, three different types of fiber, including basalt fiber (BF), glass fiber (GF), and polyester fiber (PF); five types of fiber contents (0.1% to 0.5% by mass of the mixtures); and two types of aggregates (basalt and limestone) were selected. Experimental methods such as the Bond Strength Test (BBS), Disk-Shaped Compact Tension test (DCT), and interfacial image processing were used in order to assess the strength of interfacial interaction and resistance to cracking under both dry and wet conditions. The results showed that the addition of fibers could enhance fiber asphalt mastic-aggregate interfacial strength; under the influence of moisture infiltration, the interfacial strength showed a significant downward trend. In the process of fiber content increasing from 0.1% to 0.5%, the peak load and fracture energy of fiber asphalt mixtures were first increased and then decreased. The interface between asphalt mastic and aggregate is easier to spalling after being subjected to moisture infiltration, resulting in a decrease in cracking resistance. Compared with the dry environment, after moisture infiltration, the correlation index between interfacial strength and fracture energy is much higher than other influencing factors. The interfacial strength is still an important factor affecting the fracture energy. These findings provide valuable insights for the design and application of more durable asphalt pavement.
水分渗入直接影响纤维沥青集料的界面特性以及沥青混合料的抗裂性能。为了研究沥青混合料界面特性与浸水稳定性之间的相关性，选取了三种不同类型的纤维，包括玄武岩纤维（BF）、玻璃纤维（GF）和聚酯纤维（PF）；五种纤维掺量（占混合料质量的0.1%至0.5%）；以及两种集料（玄武岩和石灰岩）。采用粘结强度试验（BBS）、圆盘形紧凑拉伸试验（DCT）和界面图像处理等试验方法，以评估干湿条件下界面相互作用强度和抗裂性能。结果表明，纤维的加入可提高纤维沥青胶浆与集料的界面强度；在水分渗入的影响下，界面强度呈现显著下降趋势。在纤维掺量从0.1%增加到0.5%的过程中，纤维沥青混合料的峰值荷载和断裂能先增大后减小。沥青胶浆与集料的界面在受到水分渗入后更容易剥落，导致抗裂性能下降。与干燥环境相比，水分渗入后，界面强度与断裂能之间的相关指数远高于其他影响因素。界面强度仍是影响断裂能的重要因素。这些研究结果为设计和应用更耐用的沥青路面提供了有价值的见解。
