QUANTITATIVEESTIMATION OF STEEL CORROSION IN MORTAR DUE TO CARBONATION

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  • 中性化によるモルタル中の鉄筋腐食の定量的評価
  • チュウセイカ ニヨル モルタルチュウ ノ テッキン フショク ノ テイリョウテ

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The purpose of this study is to estimate of the rate of steel corrosion in the carbonated mortar. An accelerated carbonation test and a cyclic accelerated carbonation and water-spray test were performed with the mortar specimens embedded steel bar. The amount of steel corrosion, electro-chemical properties, -potential and corrosion current of steel bar, resistivity of mortar-, were measured.<br>The corrosion rate of steel bar depends on the depth of carbonation, resistivity of mortar and diffusivity of oxygen. And theresistivity depends on the degree of hydration and carbonation, the water content of moratr and temperature.<br>Based on these results, the corrosion model was proposed. The amount of steel bar in mortar due to carbonation can be predicted by using this model.

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