Effect of Concrete Sludge Leakage under Construction of Highway Bridge Slab on Its Concrete Strength
Kensuke SHIMIZU, Makoto IMANO, Toshiaki SAWANO, Tetsukazu KIDA, Tadashi ABE, Kiyoshi KATO, Naoki KATO and Makiko TAKANO
Abstract:In recent years, the wider width and the smaller number of main girders for the highway bridges have been adopted in order to abridge the constructional and maintenance works reasonably. The metal hangers on the girder to construct the timbering, for the painting work and so on are indispensable, but there are some problems from the point of view of attractive scene and fatigue of main girder; in addition, the increase of total cost inevitably results from such a metal hangers, too. Particularly, in the case of construction of concrete slab for the bridge pavement, the concrete sludge leaks out of the opening between the upper flange of main girder and the form of slab and it stains not only the girder itself, but also it becomes a structural weak point from the viewpoint of the durability. Therefore, the special leakage-proof packing has been developed in order to overcome those difficulties. The present paper, particularly deals with the verification of the effect of the sludge leakage out of the opening part on the concrete strength by virtue of the structural models. Key Words:Bridge, Concrete slab, Sludge leakage, Girder, Upper flange, Form, Strength, Durability