山陽新幹線RC高架橋に適用する表面被覆工法の評価方法について

概要

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Concrete surface coating method is one of the repair methods applied to deteriorated RC structures. By coating the concrete surface, coating materials protect the surface and prevent the harmful substances penetrating inside and deteriorated concrete debris dropping to third party. This method has been used with various techniques and materials. However its durability performance is not clear completely.The premature deterioration of San-yo Shinkansen RC Structures is mainly caused by carbonation, but this method applied to RC structures deteriorated by carbonation induced corrosion was few. Therefore, for upgrading the durability of this method when it is applied for the purpose of stopping further deterioration, on-site test and exposure specimen test have been continued since 2001 with 13 kinds of concrete surface coating materials. Various examinations (carbonation depth, bond strength, weathering resistance, and various kinds of permeability) have been carried out in 1, 3, and 5 years from the beginning. Test methods and their standards are also discussed.
日本材料学会の論文