CELL FORMATION PATTERN AND RATE OF STEEL CORROSION INDUCED BY CHLORIDE OR CARBONATION IN MORTAR WITH DEFECTS

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  • モルタルの欠陥部に生じる塩害あるいは中性化による鉄筋腐食の形態と速度
  • モルタル ノ ケッカンブ ニ ショウジル エンガイ アルイワ チュウセイカ ニ ヨル テッキン フショク ノ ケイタイ ト ソクド

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The objective was to clear comprehensively the corrosion cell formation pattern (macro-cell and micro-cell) and the rate induced by chloride or carbonation in mortar with defects. Therefore, the corrosion cell formation pattern and the rate were analyzed using the model defects simulated cold joints and cracks. Herein three parameters were set: 1) supply of Cl- or CO2, 2) supply of H2O and O2, 3) W/C. As a results; with presence of defects, A) in the case of chloride-induced corrosion, the decreasing W/C increased the activity of macro-cell corrosion, while the increasing W/C prevailed the micro-cell corrosion, and there was the case in which the corrosion rate became high at the low W/C, B) in the case of carbonation-induced contusion, macro-cell corrosion was formed regardless of W/C, also the corrosion rate decreased at the low W/C, C) the chloride induced corrosion rate was higher than that induced by carbonation.

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