四川建材

为研究不同种类纤维对沥青混合料力学性能的影响，分别在沥青混合料中掺加玄武岩纤维、玻璃纤维、聚酯纤维，通过单轴贯入试验、动态模量试验、间接拉伸开裂试验研究纤维沥青混合料的力学性能，并通过数字图像相关技术研究纤维对沥青混合料开裂过程中实时应变的影响。结果表明，三种纤维均能够改善沥青混合料高温抗剪切性能、动态黏弹性和抗裂性能，玄武岩纤维和玻璃纤维对于高温抗剪切性能的改善效果相较聚酯纤维明显；在10 Hz的频率下，玄武岩纤维对动态模量的提升效果强于另外两种纤维；纤维对于抗裂性能改善效果明显，其中玄武岩纤维最优，聚酯纤维仅CT_index指标优于玻璃纤维；纤维能够减缓沥青混合料应变发展，起到阻裂作用。

To investigate the influence of different types of fibers on the mechanical properties of asphalt mixtures, basalt fiber, glass fiber, and polyester fiber were added to asphalt mixtures respectively.The mechanical properties of fiber-reinforced asphalt mixtures were studied through uniaxial penetration tests, dynamic modulus tests, and indirect tensile cracking tests, and the effect of fibers on the real-time strain of asphalt mixtures during the cracking process was analyzed using digital image correlation(DIC)technology.The results show that all three types of fibers can improve the high-temperature shear resistance, dynamic viscoelasticity, and crack resistance of asphalt mixtures.Basalt fiber and glass fiber exhibit significantly better performance in enhancing high-temperature shear resistance compared to polyester fiber.At a frequency of 10 Hz, basalt fiber has a stronger effect on improving dynamic modulus than the other two fibers.Fibers remarkably improve the crack resistance of asphalt mixtures, among which basalt fiber performs the best, while polyester fiber is superior to glass fiber only in terms of the CT_index.Additionally, fibers can slow down the strain development of asphalt mixtures and play a role in crack resistance.