MA类沥青混合料疲劳性能评价方法研究

发布时间：2018-01-13 19:23

本文关键词：MA类沥青混合料疲劳性能评价方法研究　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：传统的方法在实际评价MA(Mastic Asphalt，沥青玛蹄脂)类沥青混合料的疲劳性能时，，由于其时间长，在实际过程中并不现实。目前常使用冲击韧性法来评价普通沥青混合料的疲劳性能，该方法能否适用于MA类沥青混合料目前还未知。沥青路面承受车辆荷载的重复作用，作用时间短、作用力大，符合冲击荷载的特征，而且冲击韧性是一个能量的概念，不受荷载模式的影响，所以采用冲击韧性评价MA类沥青路面抵抗疲劳开裂的能力在理论上是可行的。本文研究是建立在港珠澳大桥桥面铺装研究阶段，因此试验研究采用的A-70沥青材料、特立尼达湖沥青（TLA），以及集料和矿粉等。实验所需试件取自试验路段，在实验室用双面切割机分别成型四点疲劳实验小梁和冲击韧性小梁。使用Cooper疲劳试验机进行四点疲劳试验，在5个应变水平（300με、600με、700με、800με、900με）下，得出疲劳试验数据结果，并分析得出了MA/GMA(Guss Mastic Asphalt)两种不同工艺下的MA类混合料疲劳寿命预测方程。本文采用MTS试验机对MA类沥青混合料小梁试件进行冲击韧性试验，计算得出其冲击韧性值，结果表明： MA类沥青混合料施工工艺（MA和GMA）不同，其冲击韧性值也相差较大，即混合料的疲劳性能也不相同；拌和时间是影响MA类沥青混合料冲击韧性的重要因素，温度也会影响冲击韧性，但其影响程度小于拌和时间；同种工艺下，配合比不同，混合料冲击韧性值也不同。本文验证了小梁试件冲击韧性与四点疲劳试验疲劳寿命、总耗散能的相关性，并分别建立了二者之间的数学关系。得出相关结论，具体如下：1）两种不同工艺的MA类沥青混合料不同配合比的冲击韧性与疲劳寿命进行相关性分析，两者呈线性相关，其相关性良好，在工程过程中可以用冲击韧性试验来估计其疲劳寿命。老化程度不同，两者线性关系依然良好。2）两种不同工艺的MA类沥青混合料不同配合比的冲击韧性与累积耗散能进行相关性分析，两者呈线性相关，其相关性良好，在工程过程中可以用冲击韧性试验来估计其累积耗散能。老化程度不同，两者线性关系依然良好。3）沥青混合料冲击韧性与疲劳寿命和累积耗散能均呈线性相关，且其相关性都较好，但是又有所其别：在同一老化程度，改变配合比，累积耗散能优于疲劳寿命；在相同的配合比，老化程度不同时候，相关性疲劳寿命优于累积耗散能。最后，冲击韧性试验是一种简单、快捷的评价MA类沥青混合料疲劳性能的试验方法，冲击韧性与四点疲劳各疲劳具有良好的相关性。可以使用冲击韧性来快速评价MA类沥青混合料的疲劳性能。
[Abstract]:The traditional method is used to evaluate the fatigue performance of MA(Mastic Asphalt asphalt mixture because of its long time. The impact toughness method is often used to evaluate the fatigue performance of common asphalt mixture. Whether this method can be applied to MA asphalt mixture is still unknown. Asphalt pavement bears the repeated action of vehicle load, the action time is short, the action force is large, accord with the characteristic of impact load. The impact toughness is an energy concept and is not affected by the load mode, so it is theoretically feasible to use impact toughness to evaluate the ability of MA asphalt pavement to resist fatigue cracking. This study is based on the bridge deck pavement research stage of Hong Kong-Zhuhai-Macao Bridge, so the A-70 asphalt material, TLA-Trinidad Lake Asphalt, is used in the experimental study. As well as aggregate and mineral powder, etc. The test samples are taken from the test section. The four-point fatigue test trabeculae and the impact toughness trabeculae were formed by double-sided cutting machine in laboratory. The four-point fatigue tests were carried out by using Cooper fatigue testing machine, and 300 渭蔚 at 5 strain levels. The fatigue test data were obtained under 600 渭蔚 -700 渭蔚 -800 渭蔚 -900 渭蔚. The prediction equation of fatigue life of MA mixture under two different processes of MA/GMA(Guss Mastic Asphalt is obtained. In this paper, MTS testing machine is used to test the impact toughness of MA type asphalt mixture trabeculae, and its impact toughness is calculated. The results show that the impact toughness of MA asphalt mixture is different from that of GMA, that is, the fatigue performance of the mixture is different. Mixing time is an important factor affecting impact toughness of MA type asphalt mixture, and temperature will also affect impact toughness, but its influence degree is smaller than mixing time. Under the same technology, mix ratio is different, mixture impact toughness value is also different. This paper verifies the correlation between the impact toughness of trabecular beams and fatigue life and total dissipation energy of four-point fatigue test, and establishes the mathematical relationship between them, and draws the relevant conclusions. Concrete as follows: 1) the impact toughness and fatigue life of two kinds of MA asphalt mixture with different mix ratio are analyzed. The relationship between them is linear, and the correlation is good. The fatigue life can be estimated by impact toughness test in engineering process. The linear relationship between the two is still good. 2) the impact toughness and cumulative dissipation energy of two kinds of MA asphalt mixture with different mix ratio are analyzed, and the correlation between them is linear, and the correlation is good. The cumulative dissipation energy can be estimated by impact toughness test in engineering process. The linear relationship between the two is still good. 3) the impact toughness of asphalt mixture is linearly correlated with fatigue life and cumulative dissipation energy, and the correlation is good, but there are some differences: in the same aging degree. The cumulative dissipation energy is better than the fatigue life when the mix ratio is changed. At the same mix ratio, the correlation fatigue life is better than the cumulative dissipation energy when the aging degree is different. Finally, the impact toughness test is a simple and fast test method to evaluate the fatigue performance of MA asphalt mixture. The impact toughness can be used to evaluate the fatigue performance of MA asphalt mixture quickly.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;U444

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