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構造物を維持管理する上で, 劣化度を評価することは非常に重要であり, コンクリート構造物の場合には, ひび割れが劣化度の指標として用いられることも多い. そのため, コンクリート中の鉄筋が腐食した場合についても, ひび割れ発生腐食量やひび割れ幅と腐食量の関係についてこれまで数多くの研究が行われてきた. しかし, 様々な結果が報告されており, かぶりや鉄筋径などの影響について体系的に整理されていないのが現状である. この原因の一つとして, 生じる腐食生成物の種類が環境によって異なることが考えられるが, これまで腐食生成物の違いはあまり考慮されていなかった. そこで本研究では, 種々の環境が腐食生成物に与える影響を検討するとともに, 腐食生成物の違いがひび割れ発生腐食量に与える影響について検討を行った.Crack width is sometimes used for evaluation of deterioration grade of concrete structures. Therefore, for crack opening weight loss of corrosion or the relationship between weight loss and crack width, many studies have been carried out. However, various results were reported, and at this point these results have not been arranged systematically with several parameters such as cover thickness, bar diameter, or concrete strength yet. It would be because influence of corrosion products have not been investigated. About 20 kinds of steel corrosion products have been found, and each products have its own density and volumetric expansion ratio. Therefore, it can be thought that difference of corrosion products will have large influence on crack opening weight loss of corrosion. Then, in this paper, at first influence of environment on corrosion products was investigated, and next influence of difference of corrosion products on crack opening weight loss of corrosion was investigated

INFLUENCE OF STEEL CORROSION PRODUCTS IN CONCRETE ON CRACK OPENING WEIGHT LOSS OF CORROSION