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首页> 外文期刊>Construction and Building Materials >Experimental study of the performance of a stress-absorbing waterproof layer for use in asphalt pavements on bridge decks
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Experimental study of the performance of a stress-absorbing waterproof layer for use in asphalt pavements on bridge decks

机译：压力吸收防水层在桥式甲板上使用沥青路面性能的实验研究

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The presence of negative bending moments at the top of a continuous beam bridge can facilitate the sawing of false seams. The concrete bridge deck and its asphalt pavement will therefore develop transverse fatigue cracks under long-term cyclic traffic loads. This paper aims at preventing reflective cracks from forming in such asphalt pavements. The structure and materials used in crack prevention based on a composite stress-absorbing layer (CSAL) consisting of a geotextile and an asphalt gravel seal coat were investigated. The properties of polypropylene (PP) geotextiles were evaluated by means of differential scanning calorimetry, thermogravimetric analysis, thermal shock tests, etc. Adhesion, shear, and tensile tests were used to study the influences of factors such as the type, amount of asphalt materials, and construction temperature on the bonding performance of the pavement interface. Texas overlay tests were also carried out to explore the anti-reflective cracking and anti-fatigue performance of different pavement structures including an asphalt rubber stress-absorbing membrane interlayer (ARSAMI) and a CSAL. The results show that the PP geotextile has a melting point of about 166 degrees C, a glass-transition temperature in the range of -20 to -10 degrees C, and a thermal decomposition temperature of about 400 degrees C. In addition, it retains good strength and deformability when subjected to thermal shock at 180 degrees C, and it has high thermal stability. The modified asphalt has the highest adhesion strength to concrete slabs, followed by ordinary asphalt and then emulsified asphalt. The temperature state of the bonding layer is not sensitive to the bond strength of the bridge deck paving structure. The asphalt mixture waterproofs the surface after paving. The adhesive stress-absorbing layer imparts a secondary heating effect, thereby ensuring interface adhesion. Using a pavement structure with a CSAL can enhance resistance to reflective cracking at a low temperature by more than 5 times compared to the case not taking preventative measures. Its resistance to reflective cracking under a deformation amplitude of 2 mm at the room temperature (20 degrees C) is also slightly better than that of the ARSAMI. Hence, CSALs have promising prospects for use in crack prevention. (C) 2020 Elsevier Ltd. All rights reserved.
机译：连续梁桥顶部的负弯矩的存在可以促进假缝的锯切。因此，混凝土桥甲板及其沥青路面将在长期循环交通负荷下发挥横向疲劳裂缝。本文旨在防止在这种沥青路面中形成反射裂缝。研究了基于由土工织物和沥青砾石密封涂层组成的复合应力吸收层（CSAL）的裂缝防治的结构和材料。通过差示扫描量热法，热重分析，热冲击试验等评价聚丙烯（PP）土工织物的性质。使用粘附，剪切和拉伸试验来研究诸如类型，沥青材料量的因素的影响和施工温度对路面界面的粘接性能。还进行了德克萨斯覆盖试验，以探讨不同路面结构的抗反射裂缝和抗疲劳性能，包括沥青橡胶应力吸收膜中间层（ARSAMI）和CSAL。结果表明，PP土工织物的熔点约为166℃，玻璃化转变温度为-20至-10℃，热分解温度为约400℃。此外，它保留在180摄氏度下进行热冲击时，具有良好的强度和变形性，并且具有高热稳定性。改性沥青具有最高的粘合强度与混凝土板，其次是普通沥青，然后乳化沥青。粘合层的温度状态对桥甲板铺路结构的粘合强度不敏感。沥青混合物在铺路后防水表面。粘合应力吸收层赋予二次加热效果，从而确保界面粘附。使用具有CSAL的路面结构可以通过不采取预防措施的情况来增强低温下的反射裂缝的耐抗性5倍以上。其在室温（20摄氏度）在2mm的变形幅度下对反射裂缝的抵抗也比Arsami的变形幅度略好。因此，CSALS具有希望防范的前景。 （c）2020 elestvier有限公司保留所有权利。

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