Research On Waterproof And Cohesive Layer Of Concrete Bridge Deck Asphalt Pavement

The bridge deck diseases of Asphalt concrete, especially the early damages, indicate a fact that it is important to set the waterproof and cohesive layer in pavement structure. Nowadays in China, little studies on this topic is made, the lack of the theories and practical experience often leads to a considerable blindness result in design and construction stages.Basing on Binzhou Expressway Bridge over Yellow River, in this paper, the finite element mechanics method is taken to establish a space model of 3-dimension and analyze it, in which the bridge deck, longitudinal and transverse strengthening ribs and asphalt pavement work together. Considering the constitution of bridge flooring system, orientation of load, parameters of material performance, etc, the change of shearing strength is studied and the most disadvantage status is obtained. All of these provide theory directions for design and construction.As the complicated characteristic of bridge pavement while under the vehicle load, it is necessary to request an excellent performance of physics and mechanics. On base of different testing, the paper compared the capability of three flexible waterproof and cohesive materials, and at the same time, testing means and evaluating indexes are studied to choose waterproofing material properly. Tests demonstrated again that construction of waterproofing layer is essential. Furthermore, based on the many tests and combined with the field experimentation research in real project, the paper discussed construction of the three kinds of materials, introduced the corresponding measures for real-time control and to insure the construction quality.