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A new test method for determining the fracture toughness of concrete materials / John Jy-An Wang in Cement and concrete research, Vol. 40 N° 3 (Mars 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 3 (Mars 2010) . - pp. 497–499 Titre : A new test method for determining the fracture toughness of concrete materials Type de document : texte imprimé Auteurs : John Jy-An Wang, Auteur ; Ken C. Liu Dan Naus, Auteur Année de publication : 2012 Article en page(s) : pp. 497–499 Note générale : Bibliogr. Langues : Anglais (eng) Mots-clés : Fracture  toughness  ;  Mortar  ;  Concrete Résumé : The Spiral Notch Torsion Test (SNTT) determines the intrinsic fracture toughness (KIC) of structural materials by applying pure torsion to cylindrical specimens having a notch line that spirals around the specimen at a 45° pitch. KIC values are obtained with the aid of a three-dimensional finite-element computer code, TOR3D-KIC. The SNTT method is suitable for testing a wide variety of materials used extensively in pressure vessel and piping structural components and weldments, as well as ceramic and graphite materials. One important characteristic of SNTT is that neither a fatigue precrack nor a deep notch is required for evaluation of brittle materials, significantly reducing the sample size requirement. Results are reported for a Portland cement-based mortar demonstrating applicability of the SNTT method to cementitious materials. The estimated KIC of the tested mortar samples with compressive strength of 34.45 MPa was found to be 0.360 ± 0.017 MPa √m. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609002725 [article] A new test method for determining the fracture toughness of concrete materials [texte imprimé] / John Jy-An Wang, Auteur ; Ken C. Liu Dan Naus, Auteur . - 2012 . - pp. 497–499. Bibliogr. Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 3 (Mars 2010) . - pp. 497–499 Mots-clés : Fracture  toughness  ;  Mortar  ;  Concrete Résumé : The Spiral Notch Torsion Test (SNTT) determines the intrinsic fracture toughness (KIC) of structural materials by applying pure torsion to cylindrical specimens having a notch line that spirals around the specimen at a 45° pitch. KIC values are obtained with the aid of a three-dimensional finite-element computer code, TOR3D-KIC. The SNTT method is suitable for testing a wide variety of materials used extensively in pressure vessel and piping structural components and weldments, as well as ceramic and graphite materials. One important characteristic of SNTT is that neither a fatigue precrack nor a deep notch is required for evaluation of brittle materials, significantly reducing the sample size requirement. Results are reported for a Portland cement-based mortar demonstrating applicability of the SNTT method to cementitious materials. The estimated KIC of the tested mortar samples with compressive strength of 34.45 MPa was found to be 0.360 ± 0.017 MPa √m. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609002725