基于大振幅振荡剪切试验的沥青在不同荷载、老化和改性条件下的非线性流变特性

Jiaqiu Xu , Zijia Wang , Zepeng Fan , Junfu Liu , Guoyang Lu , Dawei Wang
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引用次数: 0

摘要

为了揭示环境、荷载条件以及沥青性能对沥青非线性流变特性的影响,引入了大振幅振荡剪切(large amplitude振荡shear, LAOS)试验,并应用傅里叶变换流变学、Lissajous曲线法和LAOS疲劳试验研究了沥青粘结剂的非线性流变特性。研究结果表明,温度的降低、剪切频率和应变水平的提高、聚合物改性剂的引入以及沥青的老化效应都能显著增加沥青的非线性,表现为三次谐波和零应变非线性系数的相对幅度增大。对于本研究选择的两种聚合物改性剂,4%聚氨酯改性剂比4%丁苯乙烯改性剂(SBS)具有更高的非线性提升效应。长期老化对非线性粘弹性的影响明显大于短期老化。基于平均值法估计的零应变非线性系数可以准确表征沥青的非线性粘弹性,可以作为三次谐波相对量级的有效补充。试验温度为24℃时,所有沥青均表现出剪切减薄行为,试验温度的降低、剪切速率和应变水平的提高、改性剂的引入以及沥青的老化效应均加剧了沥青的剪切减薄行为。此外,沥青材料的疲劳破坏过程伴随着非线性程度的增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nonlinear rheological behavior of asphalt based on large amplitude oscillation shear test under different loading, aging, and modification conditions

Nonlinear rheological behavior of asphalt based on large amplitude oscillation shear test under different loading, aging, and modification conditions
To reveal the effects of environmental and loading conditions, as well as asphalt properties on the nonlinear rheological behavior of asphalt, the large amplitude oscillation shear (LAOS) test was introduced, and the Fourier transform rheology, Lissajous curve method, and the LAOS fatigue test have been applied to investigate the nonlinear rheological behavior of asphalt binders. The research results indicate that a decrease in temperature, an increase in shear frequency and strain level, the introduction of polymer modifiers, and the aging effect of asphalt can significantly increase the nonlinearity of asphalt, manifested by the higher relative magnitude of the third harmonic and zero-strain nonlinear coefficient. For the two polymer modifiers selected in this study, the 4% polyurethane modifier exhibits a higher nonlinear lifting effect than the 4% styrene-butadiene-styrene (SBS). The impact of long-term aging on nonlinear viscoelasticity is observably greater than that of short-term aging. The zero-strain nonlinear coefficient estimated based on the average value method can accurately characterize the nonlinear viscoelasticity of asphalt, which can serve as an effective supplement to the relative magnitude of the third harmonic. All asphalts exhibit shear thinning behavior under the test temperature of 24 ​°C, and the decrease in test temperature, the increase in shear rate and strain level, the introduction of modifiers, and the aging effect of asphalt all exacerbate the shear thinning behavior of asphalt. In addition, the fatigue failure process of asphalt materials is accompanied by an increasing degree of nonlinearity.
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