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Comparison between two ultrasonic methods in their ability to monitor the setting process of cement pastes / Gregor Trtnik in Cement and concrete research, Vol. 39 N° 10 (Octobre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. 876–882 Titre : Comparison between two ultrasonic methods in their ability to monitor the setting process of cement pastes Type de document : texte imprimé Auteurs : Gregor Trtnik, Auteur ; Marko Ivan Valič, Auteur ; Franci Kavčič, Auteur Année de publication : 2009 Article en page(s) : pp. 876–882 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cement  paste;  Hydration;  Ultrasonic  wave  transmission  method;  Ultrasonic  wave  reflection  method;  Setting Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : This paper presents the comparison between ultrasonic wave transmission (USWT) method and ultrasonic wave reflection (USWR) method in their ability to monitor the setting process of cement pastes. The velocity of ultrasonic longitudinal waves and shear wave reflection coefficient were measured simultaneously on cement pastes with different hydration kinetics. Even though both methods are able to reliably monitor the hydration process and formation of structure of an arbitrary cement paste, they monitor the setting process in different ways. The relationship between the velocity of longitudinal waves and shear wave reflection coefficient can be simplified into three characteristic phases and the end of the first phase can be used to define the beginning of the setting process of cement paste. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001537 [article] Comparison between two ultrasonic methods in their ability to monitor the setting process of cement pastes [texte imprimé] / Gregor Trtnik, Auteur ; Marko Ivan Valič, Auteur ; Franci Kavčič, Auteur . - 2009 . - pp. 876–882. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. 876–882 Mots-clés : Cement  paste;  Hydration;  Ultrasonic  wave  transmission  method;  Ultrasonic  wave  reflection  method;  Setting Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : This paper presents the comparison between ultrasonic wave transmission (USWT) method and ultrasonic wave reflection (USWR) method in their ability to monitor the setting process of cement pastes. The velocity of ultrasonic longitudinal waves and shear wave reflection coefficient were measured simultaneously on cement pastes with different hydration kinetics. Even though both methods are able to reliably monitor the hydration process and formation of structure of an arbitrary cement paste, they monitor the setting process in different ways. The relationship between the velocity of longitudinal waves and shear wave reflection coefficient can be simplified into three characteristic phases and the end of the first phase can be used to define the beginning of the setting process of cement paste. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001537