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Microstructural mechanisms of early age cracking behavior of concrete / Tongyan Pan in Journal of engineering mechanics, Vol. 137 N° 6 (Juin 2011) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 137 N° 6 (Juin 2011) . - pp.439-446 Titre : Microstructural mechanisms of early age cracking behavior of concrete : fracture energy approach Type de document : texte imprimé Auteurs : Tongyan Pan, Auteur ; Yajun Liu, Auteur ; Erol Tutumluer, Auteur Année de publication : 2011 Article en page(s) : pp.439-446 Note générale : Mécannique appliquée Langues : Anglais (eng) Mots-clés : Portland  cement  concrete  Early  cracking  Fracture  energy  Multiscale  analysis  Interfacial  transition  zone Résumé : This paper presents findings from a study directed at identifying key properties of ingredient materials that are influential on the early age cracking behavior of concrete, with an emphasis on the effects of aggregate size, aggregate morphologies, and water-cement ratio (w/c). Fracture energy (GF) was determined using a wedge-split test configuration for concrete samples at the age of 12 h. Based on image analysis, three signature morphologies of aggregate particles, i.e., the angularity, surface texture, and surface area, were quantitatively determined in terms of developed angularity index (AI), surface texture (ST) index, and surface area (SA) measurement, respectively. The high consistency between GF and aggregate SA of the concrete samples suggests that the interfacial transition zone (ITZ) at the cement paste-aggregate interface is the critical location that primarily accommodates the 12 h cracking of concrete. The critical role of ITZ in the early age cracking of concrete was further confirmed by its microstructural and chemical features under scanning electron microscopy/energy dispersive X-ray spectroscopy. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i6/p439_s1?isAuthorized=no [article] Microstructural mechanisms of early age cracking behavior of concrete : fracture energy approach [texte imprimé] / Tongyan Pan, Auteur ; Yajun Liu, Auteur ; Erol Tutumluer, Auteur . - 2011 . - pp.439-446. Mécannique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 6 (Juin 2011) . - pp.439-446 Mots-clés : Portland  cement  concrete  Early  cracking  Fracture  energy  Multiscale  analysis  Interfacial  transition  zone Résumé : This paper presents findings from a study directed at identifying key properties of ingredient materials that are influential on the early age cracking behavior of concrete, with an emphasis on the effects of aggregate size, aggregate morphologies, and water-cement ratio (w/c). Fracture energy (GF) was determined using a wedge-split test configuration for concrete samples at the age of 12 h. Based on image analysis, three signature morphologies of aggregate particles, i.e., the angularity, surface texture, and surface area, were quantitatively determined in terms of developed angularity index (AI), surface texture (ST) index, and surface area (SA) measurement, respectively. The high consistency between GF and aggregate SA of the concrete samples suggests that the interfacial transition zone (ITZ) at the cement paste-aggregate interface is the critical location that primarily accommodates the 12 h cracking of concrete. The critical role of ITZ in the early age cracking of concrete was further confirmed by its microstructural and chemical features under scanning electron microscopy/energy dispersive X-ray spectroscopy. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i6/p439_s1?isAuthorized=no