Correction of chloride threshold concentration and time-to-corrosion due to reinforcement presence / H. Yu in Materials and corrosion, Vol. 62 N° 5 (Mai 2011)  

Public ISBD [article]  inMaterials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 423–430 Titre : Correction of chloride threshold concentration and time-to-corrosion due to reinforcement presence Type de document : texte imprimé Auteurs : H. Yu, Auteur ; W. Hartt, Auteur Année de publication : 2011 Article en page(s) : pp. 423–430 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Chloride threshold concentration Diffusion coefficient Reinforcement Time-to-corrosion Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Reinforcement presence affecting corrosion threshold concentration, Ct, determination and time-to-corrosion, Ti, has been investigated. Elevated Ct and decreased Ti due to reinforcement physical obstruction on the path of chloride ingression into concrete has been examined with finite element modeling. Results indicated that reinforcement with larger size, better corrosion resistance, less cover thickness, or a more flat leading edge causes more pronounced Ti reduction. Experimental results exposed aggregate content discrepancy within reinforced bar vicinity zone. According to this finding, a multi-shell chloride diffusion model, in which specific chloride ion diffusivity in each shell surrounding bar presents, is proposed. The Ct results of proposed model are discussed along with those acquired from traditional one-dimensional model, in which chloride diffusion follows Fick's second law without considering reinforcement presence, and two-dimensional model with the effect of reinforcement physical obstruction regarded. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905516/abstract [article] Correction of chloride threshold concentration and time-to-corrosion due to reinforcement presence [texte imprimé] / H. Yu, Auteur ; W. Hartt, Auteur . - 2011 . - pp. 423–430. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 5 (Mai 2011) . - pp. 423–430 Mots-clés : Chloride threshold concentration Diffusion coefficient Reinforcement Time-to-corrosion Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Reinforcement presence affecting corrosion threshold concentration, Ct, determination and time-to-corrosion, Ti, has been investigated. Elevated Ct and decreased Ti due to reinforcement physical obstruction on the path of chloride ingression into concrete has been examined with finite element modeling. Results indicated that reinforcement with larger size, better corrosion resistance, less cover thickness, or a more flat leading edge causes more pronounced Ti reduction. Experimental results exposed aggregate content discrepancy within reinforced bar vicinity zone. According to this finding, a multi-shell chloride diffusion model, in which specific chloride ion diffusivity in each shell surrounding bar presents, is proposed. The Ct results of proposed model are discussed along with those acquired from traditional one-dimensional model, in which chloride diffusion follows Fick's second law without considering reinforcement presence, and two-dimensional model with the effect of reinforcement physical obstruction regarded. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905516/abstract

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