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

耐久板在不做防水准备时，怕水渗入顶面裂缝产生聚集现象。因此，在现行的公路桥梁设计规范中规定了在板上放置良好的防水性。一些耐用的防水系统已经被开发出来。但是，目前我国尚无适合的防水沥青路面的评价规则或规范，迫切需要开发适合的包括路面在内的防水系统的设计和评价方法。本研究的目的是利用自行研制的旋转剪切疲劳试验机和随机车轮跟踪试验机两种新型试验装置，通过两层模态的疲劳试验来发展评价方法。研究的第一个成果是对这两种试验机的性能进行校核，并得出试验条件的结论。50℃是评价粘结剪切变形的临界温度。对喷淋型和沥青板型高性能防水材料进行了上述试验，证明了其具有较高的耐久性，特别是具有较高的抗路面流动阻力。这些材料似乎不仅适用于公路桥板和飞机跑道。针对当前正交各向异性钢甲板存在的疲劳开裂问题，提出了在现有钢甲板上浇筑混凝土，将钢甲板改造为复合桥面，是提高现有钢甲板疲劳耐久性的有效方法。在混凝土的顶面也进行防水处理，避免混凝土聚集现象。因此，对于组合钢桥面，将上述防水措施置于混凝土顶面，并与路面耐久性进行了相关调查。通过提高复合作用的抗弯刚度，显著减小了钢甲板的挠度，减小了高应力集中。同时，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，混凝土分为普通混凝土和ECC特殊混凝土两种。这些混凝土和防水材料之间的粘结强度似乎是一样的。最后，采用旋转剪切疲劳机和随机车轮跟踪机对防水系统耐久性进行评价是一种有效的方法，可作为评价公路桥梁板、桥面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