复掺纤维对冷拌环氧沥青混合料的性能影响
首发时间:2024-04-29
摘要:为了研究复掺纤维对冷拌环氧SMA-10沥青混合料性能的影响,采用玄武岩纤维(basalt fiber, BF)和聚酯纤维(polyester fiber, PF)复掺,分析多种复掺纤维比例对冷拌环氧SMA-10沥青混合料的高温性能、低温抗裂性、水稳定性、抗疲劳性能及抗老化性能的影响。通过数字图像处理和离散元仿真技术构建沥青混合料二维数值模型,提取离散元模型的骨架特征参数确定纤维最佳掺配长度。复掺纤维掺量变化分别为0.3%PF、0.2%PF+0.1%BF、0.2%BF+0.1%PF、0.3%BF。结果表明:单掺0.3%玄武岩纤维的路用性能、抗疲劳性能、抗老化性能提升效果均优于单掺0.3%聚酯纤维。其中0.2%BF+0.1%PF的性能提升最佳,相较于单掺聚酯纤维和单掺玄武岩纤维,动稳定度由37 058次 mm-1和42 000次 mm-1增到45 000次 mm-1,增长了21.4%、7.1%,抗弯拉强度由29.01 MPa和30.53 MPa上升为32.08 MPa,提高了10.6%、5.1%,650 με应变条件疲劳寿命由163万次和183万次增至197万次,分别提高了20.9%、7.7%。在冷拌环氧SMA-10沥青混合料中复掺纤维可以提升其路用性能,玄武岩纤维和聚酯纤维复掺效果优于单掺。
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Influence of composite fiber on performance of cold mix epoxy asphalt mixture
Abstract:In order to study the effect of composite fiber on the performance of cold-mixed epoxy SMA-10 asphalt mixture, basalt fiber (BF) and polyester fiber (PF) were used to analyze the effects of various composite fiber ratios on the high temperature performance, low temperature crack resistance, water stability, fatigue resistance and aging resistance of cold-mixed epoxy SMA-10 asphalt mixture. The two-dimensional numerical model of asphalt mixture is constructed by digital image processing and discrete element simulation technology. The skeleton characteristic parameters of discrete element model are extracted to determine the optimal fiber blending length. The change of fiber content is 0.3%PF, 0.2%PF+0.1%BF, 0.2%BF+0.1%PF, 0.3%BF. The results show that the road performance, anti-fatigue performance and anti-aging performance of 0.3% basalt fiber are better than that of 0.3% polyester fiber. Among them, 0.2%BF+0.1%PFhas the best performance improvement. Compared with single-doped polyester fiber and basalt fiber, the dynamic stability of 0.2%BF+0.1%PF increased from 37 058 times mm-1 and 42 000 times mm-1 to 45 000 times mm-1, increased by 21.4% and 7.1%, and the flexural tensile strength increased from 29.01 MPa and 30.53 MPa to 32.08 MPa, increased by 10.6% and 5.1%. The fatigue life under 650 με strain condition increased from 1.63 million times and 1.83 million times to 1.97 million times, which increased by 20.9% and 7.7% respectively. The mixed fiber in the cold mix epoxy SMA-10 asphalt mixture can improve its road performance, and the mixed effect of basalt fiber and polyester fiber is better than that of single fiber.
Keywords: road engineering;cold-mixed epoxy asphalt discrete element simulation SMA-10 basalt fiber fiber blending road performance
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