Durability Evaluation of [Slab+Water Proofing Layer+Pavement] System by Random Wheel Tracking Testing Machine

当耐久板上的防水层没有准备好时，它害怕水渗透到顶面裂缝中而产生聚集现象。因此，在现行公路桥梁设计规范中规定了在桥面板上设置良好的防水层。已经开发了一些耐用的防水系统。然而，目前还没有合适的防水和沥青路面的评价规则或规范，发展合适的防水系统，包括路面的设计和评价方法是迫切需要的。本文利用自行研制的旋转剪切疲劳试验机和随机轮迹试验机，通过两层模态的疲劳试验，研究了疲劳性能的评定方法。50 ℃是评价粘结剪切变形的临界试验温度。用于高性能水处理 ...更多信息 对喷射型和沥青片状防水材料进行了上述试验，证明这些材料具有很高的耐久性，特别是可以检查出很高的抗路面流的能力。这些材料似乎不仅适用于公路桥梁板和飞机跑道。针对近年来正交异性钢桥面板的疲劳开裂问题，通过在钢桥面板上浇筑混凝土，将钢桥面板改造成组合钢桥面板，是提高既有钢桥面板疲劳耐久性的有效方法。混凝土顶面也做防水处理，避免混凝土团聚现象。因此，对于组合钢桥面，上述防水层被放置在混凝土的顶面，并与路面的耐久性进行了调查。通过增加组合作用的抗弯刚度，可以显著减小钢桥面板的挠度，消除高应力集中。防水层与沥青路面的粘结性能良好，路面变形减小。在最后的研究中，将混凝土分为普通混凝土和ECC特殊混凝土两种。最后，旋转剪切疲劳试验和随机轮迹试验的耐久性评价方法可以说是防水系统耐久性评价的有效方法，可以推荐作为评定公路桥梁桥面板防水性能的标准方法。少

When water proofing on durable slabs is not prepared, it is afraid of aggregation phenomena by water penetration into cracks on the top surface. Therefore, placing of good water proofing on slabs is designated in the current design specifications of highway bridges. Some durable water proofing systems have been developed. However, there is not appropriate evaluation rule or specification of the water proofing and asphalt pavement, development of appropriate design and evaluation method of water proofing system including pavement is strongly desired. The present study aims to development the evaluation method through fatigue tests on two layer modes with new testing devices of the rotating shearing fatigue machine and random wheel tracking machine developed by the authorsThe first research result is checks of performance of those testing machines and findings for testing conditions. 50℃ was a critical testing temperature to evaluate bonding shear deformation. For high performance water … More proofing materials of spray type and asphalt sheet type, the above mentioned tests were carried out and high durability of those materials were proved, especially high resistance against pavement flow could be checked. Those materials seem to be useful for not only highway bridge slabs and runway of airplanes. For recent fatigue cracking problems on orthotropic steel deck, the authors have reported that changing the steel deck into a composite deck by casting concrete on the deck is a useful method to enlarge fatigue durability of existing steel decks. On the top surface of the concrete, water proofing is also available to avoid concrete aggregation phenomenon. Therefore, for the composite steel decks, the above mentioned water proofing was placed on the top surface of concrete and was surveyed relating with the durability of pavement. By increasing of bending rigidity of the composite action, deflection of steel deck decreased remarkably and high stress concentration diminished. Also, good performance of bonding between water proofing and asphalt pavement was achieved accompanying with decrease of deformation of pavement. In the last research, concrete were changed into two of normal concrete and a special concrete of ECC. Bonding strengths between those concrete and water proofing seemed to be same.Finally, the evaluating methods by rotating shearing fatigue machine and random wheel tracking machine could be said useful method for durability of water proofing system and can be recommended as appropriate standard method to rate performance of water proofing of slabs and decks of highway bridges. Less