Application of Silane-Based Impregnation for Complex Damaged Reinforced Concrete Subjected to Penetration of Salt Water
Concrete structures constructed in cold regions have been heavily deteriorated by the supply of deicing salts.The deterioration mechanism is often considered as the combination of the chloride-induced steel corrosion and the cyclic freezing and thawing of concrete.Moreover, the concrete could be affected by the alkali silica reaction (ASR) if the reactive aggregates are contained in the concrete.In order to clarify the complex deterioration mechanism of reinforced concrete structures subjected to the salt water penetration and to confirm the repair or protection effect of the silane-based surface impregnation applied for such structures in the severe environment, the experimental investigations were carried out.Reinforced concrete (RC) specimens, a.part of them contained ASR reactive aggregates, were subjected to the salt water penetration under the cyclic freezing and thawing condition, followed by the high humidity and high temperature storage for accelerating ASR expansion of concrete.As a result, it was found that the scaling of concrete was accelerated by the freezing and thawing with the penetration of the salt water, which promoted the steel corrosion in concrete.The highest scaling rate was measured in the case of concrete containing premixed chlorides and reactive aggregates subjected to the 3% salt water penetration.The treatment with the silane-based surface impregnation delayed the initiation of the concrete scaling although the scaling rate after the initiation was higher than the case of the non-impregnated specimens.
silane-based surface impregnation chloride penetration reactive aggregate cyclic freezing and thawing
K.Ohtani T.Ueda K.Nakayama M.Tsukagoshi
Tokushima University, Tokushima, Japan
国际会议
福州
英文
579-586
2018-11-04(万方平台首次上网日期,不代表论文的发表时间)