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首页> 外文期刊>Construction and Building Materials >Effects of freeze-thaw cycles on fatigue performance of asphalt mixture and development of fatigue-freeze-thaw (FFT) uniform equation
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Effects of freeze-thaw cycles on fatigue performance of asphalt mixture and development of fatigue-freeze-thaw (FFT) uniform equation

机译：冻融循环对沥青混合料疲劳性能的影响及疲劳冻融统一方程的建立

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摘要

Although it is widely recognized that freeze-thaw cycles can accelerate the performance deterioration and lead to premature failures of asphalt pavements, a quantitative understanding of how it affects the fatigue life is so far still lacking. This study aims to identify the effects of freeze-thaw cycles on fatigue performance of asphalt mixture. For this, the indirect tensile fatigue tests were performed up on the specimens to measure the fatigue life of the freeze-thaw damaged specimens. Results suggest that fatigue life N-f decreases with the increase of saturation and number of freeze-thaw cycles and the decrease rate of fatigue life N-f becomes more pronounced at higher stress levels. The effects of freeze-thaw cycles on fatigue performance of asphalt mixture were quantified by establishing fatigue-freeze-thaw (FFT) uniform equation through two different strategies: the equivalent damage principle-based approach and the direct modification approach. A comparison study indicates that the FFT uniform equation based on equivalent damage principle and exponential shift factor function can best describe the coupling effect between freeze-thaw cycles and fatigue. (C) 2020 Elsevier Ltd. All rights reserved.
机译：尽管人们普遍认识到，冻融循环会加速性能恶化并导致沥青路面过早损坏，但到目前为止，仍缺乏对它如何影响疲劳寿命的定量理解。本研究旨在确定冻融循环对沥青混合料疲劳性能的影响。为此，对样品进行了间接拉伸疲劳试验，以测量冻融损坏的样品的疲劳寿命。结果表明，疲劳寿命N-f随饱和度和冻融循环次数的增加而降低，疲劳寿命N-f的降低速率在较高应力水平下更为明显。通过两种不同的策略：基于等效损伤原理的方法和直接修正方法，建立了疲劳-冻融（FFT）统一方程，从而量化了冻融循环对沥青混合料疲劳性能的影响。一项比较研究表明，基于等效损伤原理和指数位移因子函数的FFT统一方程可以最好地描述冻融循环与疲劳之间的耦合效应。 （C）2020 Elsevier Ltd.保留所有权利。

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