紫外老化对沥青混合料低温性能及力学性能的影响研究

Study on Influence of Ultraviolet Aging on Low Temperature and Mechanical Property of Asphalt Mixture

为研究紫外老化对沥青混合料低温及力学性能的影响,首先通过人工模拟沥青混合料紫外老化试验、弯曲试验评价老化后混合料低温抗拉伸性;然后用单轴压缩试验得到不同紫外辐照时间下沥青混合料弹性模量和泊松比。结果表明:沥青混合料的抗拉伸性能随老化时间逐渐降低,在紫外老化110小时后抗拉伸性能无明显变化;沥青混合料的弯曲劲度模量不适合用来评价混合料的弯曲性能;沥青混合料的弹性模量呈现逐渐变大的规律,而泊松比并没有出现明显的规律性变化。

In this paper, in order to study the influence of ultraviolet aging on the low temperature and mechanical property of the asphalt mixture, the ultraviolet aging test on the asphalt mixture is simulated artificially. The low temperature tensile resistance of the aged mixture was evaluated by the bending test. The elastic modulus and the Poisson＇s ratio of the asphalt mixture under different UV irradiation time were obtained by uniaxial compression test. The results show that the tensile resistance property of asphalt mixture decreases with the aging time and is not significantly changed mixture is not suitable for evaluating the bending after 110 h of UV aging. The flexural modulus of asphalt performance of the mixture. The elastic modulus of the asphalt mixture is gradually increasing and the Poisson＇s ratio does not show obvious regular change.