Autogenous healing of engineered cementitious composites under wet–dry cycles / Yingzi Yang in Cement and concrete research, Vol. 39 N° 5 (Mai 2009)  

Public ISBD [article]  inCement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 382–390 Titre : Autogenous healing of engineered cementitious composites under wet–dry cycles Type de document : texte imprimé Auteurs : Yingzi Yang, Auteur Année de publication : 2009 Article en page(s) : pp. 382–390 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Self-healing  Mechanical properties  Transport Tensile Permeability  Cracks Résumé : Self-healing of Engineered Cementitious Composites (ECC) subjected to two different cyclic wetting and drying regimes was investigated in this paper. To quantify self-healing, resonant frequency measurements were conducted throughout wetting–drying cycles followed by uniaxial tensile testing of self-healing ECC specimens. Through self-healing, crack-damaged ECC recovered 76% to 100% of its initial resonant frequency value and attained a distinct rebound in stiffness. Even for specimens deliberately pre-damaged with microcracks by loading up to 3% tensile strain, the tensile strain capacity after self-healing recovered close to 100% that of virgin specimens without any preloading. Also, the effects of temperature during wetting–drying cycles led to an increase in the ultimate strength but a slight decrease in the tensile strain capacity of rehealed pre-damaged specimens. This paper describes the experimental investigations and presents the data that confirm reasonably robust autogenous healing of ECC in commonly encountered environments for many types of infrastructure. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000222 [article] Autogenous healing of engineered cementitious composites under wet–dry cycles [texte imprimé] / Yingzi Yang, Auteur . - 2009 . - pp. 382–390. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 382–390 Mots-clés : Self-healing  Mechanical properties  Transport Tensile Permeability  Cracks Résumé : Self-healing of Engineered Cementitious Composites (ECC) subjected to two different cyclic wetting and drying regimes was investigated in this paper. To quantify self-healing, resonant frequency measurements were conducted throughout wetting–drying cycles followed by uniaxial tensile testing of self-healing ECC specimens. Through self-healing, crack-damaged ECC recovered 76% to 100% of its initial resonant frequency value and attained a distinct rebound in stiffness. Even for specimens deliberately pre-damaged with microcracks by loading up to 3% tensile strain, the tensile strain capacity after self-healing recovered close to 100% that of virgin specimens without any preloading. Also, the effects of temperature during wetting–drying cycles led to an increase in the ultimate strength but a slight decrease in the tensile strain capacity of rehealed pre-damaged specimens. This paper describes the experimental investigations and presents the data that confirm reasonably robust autogenous healing of ECC in commonly encountered environments for many types of infrastructure. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000222

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