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

耐久板材不防水时，怕水渗入顶面裂缝而产生团聚现象。因此，在现行公路桥梁设计规范中，对铺设防水性能较好的桥面进行了规定。一些耐用的防水系统已经被开发出来。然而，目前还没有合适的防水和沥青路面的评价标准或规范，迫切需要研究出合适的包括路面在内的防水系统的设计和评价方法。本研究旨在利用自行研制的旋转剪切疲劳试验机和随机轮轨试验机这两种新型试验机，通过两层模式的疲劳试验建立疲劳评价方法。研究成果一是对试验机的性能进行检查，并对试验条件进行分析。50℃是评价粘结剪切变形的临界试验温度。用于高性能的水…对较多的喷淋式和沥青片式防水材料进行了上述试验，证明了这些材料具有较高的耐久性，特别是抗路面流动性较高。这些材料似乎不仅适用于公路桥板和飞机跑道。针对目前正交异性钢桥面的疲劳开裂问题，通过在桥面上浇筑混凝土将钢桥面改为组合桥面，是提高既有钢桥面疲劳耐久性的有效方法。在混凝土的顶面还进行了防水处理，避免了混凝土的集结现象。因此，对于组合钢桥面，在混凝土顶面设置了上述防水措施，并对其进行了与路面耐久性相关的检测。随着组合作用抗弯刚度的增大，钢桥面挠度显著减小，高应力集中程度减小。在减少路面变形的同时，获得了良好的防水与沥青路面粘结性能。在最后的研究中，将混凝土分为两种普通混凝土和一种特殊的ECC混凝土。最后，旋转剪切疲劳试验机和随机轮跟踪试验机的评价方法可作为评价公路桥面防水系统耐久性的有效方法，可推荐作为公路桥梁桥面板防水性能评定的合适标准方法。较少

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