腐食・防食Ⅱ

[1196] RECOVERY IN MIX POTENTIAL AND POLARIZATION RESISTANCE OF STEEL BAR IN CEMENT HARDENED MATRIX DURING EARLY AGE OF SIX MONTHS-SEA-WATER MIXED MORTAR AND CRACKED CONCRETE-

Amry Dasar¹, 濵田秀則², 佐川康貴², 山本大介² (1.Kyushu University 2.九州大学)

キーワード：electrochemical method, corrosion potential, sea-water mixing, cracked concrete, 電気化学的方法, 腐食電位, 海水混合, 亀裂コンクリート

Sea-water contains high chloride ion concentration which can promote corrosion of steel bar. However, it has a potential to be used as mixing water. On the other hand, cracks should be avoided in reinforced concrete for durability reason. Previous research showed thicker cover depth gave positive effect on potential and passivity film condition of steel bar. This paper focuses on the electrochemical property of steel bar embedded in cement hardened matrix during very early age until six month after casting, under continuing hydration activity. In addition, electrochemical performance showed positive trend by increment in time as well as utilization of mineral admixture.