MECHANISM OF CHLORIDE-INDUCED CORROSION ON MAIN REBARS AND STIRRUPS NEAR BENDING CRACKS

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  • 曲げひび割れ近傍に生じる主鉄筋とスターラップの塩化物腐食形成機構

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In this study, the chloride induced corrosion mechanism and the rate were experimentally investigated on reinforced concrete beams with bending cracks. Special features of this study include: crack formation through application of bending load, consideration of main rebars and stirrups separately and as a whole, and measurements of both macro-cell and micro-cell currents. Indoor experiments were conducted to investigate local corrosion of main rebars and stirrups. Then, the corrosion of main rebars and stirrups was studied on model beams. To clarify the indoor test results, larger scale beams exposed to outdoor environment were investigated. Results of the importance of stirrups near cracks on corrosion and the influence of existence of cracks on the corrosion mechanism and rate are reported.

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