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Mechanical characterization of asphalt mixes inter-layer bonding based on reptation theory
Construction and Building Materials ( IF 7.4 ) Pub Date : 2020-01-24 , DOI: 10.1016/j.conbuildmat.2020.118063
Saannibe Ciryle Somé , Arnaud Feeser , Mouna Jaoua , Thierry Le Corre

A bituminous pavement is composed of several layers. The bonding of the interfaces between these layers is essential to ensure the durability of the pavement structure. Un-bonded interfaces can cause early deterioration of the surface courses due to the poor distribution of mechanical loads induce by the traffic onto the base-layers. The bonding between asphalt layers depends on several parameters such as the laying temperature, the use or not of bitumen emulsions to bond the interfaces. Bonding is usually characterized by shear, tensile or torsion tests. This paper focuses on the effects of loading rate, test temperature, specimens’ size and emulsion content on the shear strength evaluated through the shear and tensile tests. In part 1, the shear bond test (SBT) and tensile adhesive test (TAT) were firstly performed on two-layered specimens bonded or not with emulsion. Their diameters were 100 or 150 mm. The tests were carried out at 50 mm.min-1 and 20 °C to evaluate the laying conditions (laying temperature, use or not of emulsion). These results were then compared to those of one-layer specimens without interface. The results of part 1 investigations showed that: i) the shear strengths of small samples are 1.3 times higher than that of big specimens, ii) the shear strength resulting from different laying conditions can be classified, from the highest to the lowest, as follows: hot on hot (H/H) bonding, hot on cold (H/C) bonding with emulsion C69B2 and hot on cold (H/C) bonding without emulsion, iii) the failure strengths of TAT are 2.2 times lower than those of SBT. In part 2, the SBT was performed on two-layered specimens of 100 mm in diameter at three loading rates (0.5, 5, 50 mm.min-1) and test temperatures (−10 °C, 5 °C, 20 °C). In this second test series, 250 and 500 g.m-2 of bitumen emulsion C69B2 and styrene-butadiene rubber (SBR) polymer emulsion were used to bond the interfaces. Based on these results the master curves of shear strength were built based on the frequency-temperature superposition principle (FTSP). Furthermore, an explanation of the interfaces bonding mechanism based on the bitumens’ macromolecules chains mobility across the interface is proposed. This interpretation required the introduction of some interface bonding parameters: the degree of intimate Dic contact, the degree of healing Dh and the degree of bonding Db. Finally, the master curves of the degree of healing and degree of bonding were also built based on the frequency-temperature superposition principle (FTSP).



中文翻译:

基于胶凝理论的沥青混合料层间粘结的力学表征

沥青路面由几层组成。这些层之间的界面的结合对于确保路面结构的耐久性至关重要。由于流动到基层上引起的机械负载分布不均,未结合的界面会导致表面层的早期劣化。沥青层之间的粘结取决于几个参数,例如铺设温度,是否使用沥青乳液粘结界面。粘结通常通过剪切,拉伸或扭转测试来表征。本文重点研究了加载速率,测试温度,试样尺寸和乳液含量对通过剪切和拉伸测试评估的剪切强度的影响。在第1部分中 首先对不与乳液粘结的两层试样进行了剪切粘结试验(SBT)和拉伸粘合试验(TAT)。它们的直径为100或150毫米。测试在50岁时进行 毫米--1个和20°C来评估铺设条件(铺设温度,是否使用乳液)。然后将这些结果与没有界面的单层样品的结果进行比较。第一部分研究的结果表明:i)小样本的剪切强度比大样本的剪切强度高1.3倍; ii)可以根据不同的铺设条件将剪切强度从最高到最低分类如下: :热(H / H)热粘合,使用乳胶C69B2的热(H / C)热粘合和不使用乳剂的热(H / C)热粘合(iii)TAT的破坏强度比HAT低2.2倍SBT。在第2部分中,对三种直径分别为0.5、5、50和100的直径为100 mm的两层样本进行SBT 毫米--1个)和测试温度(−10°C,5°C,20°C)。在第二个测试系列中,分别为250和500 G--2使用沥青乳液C69B2和丁苯橡胶(SBR)聚合物乳液粘结界面。基于这些结果,根据频率-温度叠加原理(FTSP)建立了抗剪强度的主曲线。此外,提出了基于沥青的大分子链在界面上迁移的界面键合机理的解释。这种解释需要引入一些接口绑定参数:亲密程度d我知道了 接触,愈合程度 dH 和粘合程度 db。最后,还基于频率-温度叠加原理(FTSP)建立了愈合度和粘结度的主曲线。

更新日期:2020-01-24
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