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Non-destructive testing for evaluation of physical properties in fresh cementitious materials using elastic-wave methods
On the basis of currently available research results, this paper describes non-destructive testing for evaluation of physical properties in fresh cementitious materials using Elastic-Wave Methods. In the experiment, a single cylinder rotational viscometer was used for viscosity measurement, and the relationship between changes in the physical properties of the cement paste and its ultrasonic propagation characteristics were discussed. The following conclusions were obtained in this study. In the experiments, apparent viscosity measured with a rotational viscometer increases sharply when the ultrasonic wave velocity remains stable at approximately 1500 m/s. Therefore, within the limits of this study, evaluation of changes in apparent viscosity of cement paste using wave velocity is thought to be difficult. The maximum amplitude ratio is considered to be an ultrasonic wave propagation index that reflects the increase in apparent viscosity associated with changes in physical properties during the setting and hardening of cement paste. The apparent viscosity is an index for evaluating the shear stress resistance of cement paste. Maximum amplitude is therefore a characteristic value of propagation that adequately reflects changes in shear stress resistance. Frequency distribution, like maximum amplitude ratio, is a physical property index for evaluating the shear stress resistance of cement paste. Unlike maximum amplitude, frequency distribution does not depend on elastic wave energy.
Non-destructive testing for evaluation of physical properties in fresh cementitious materials using elastic-wave methods
On the basis of currently available research results, this paper describes non-destructive testing for evaluation of physical properties in fresh cementitious materials using Elastic-Wave Methods. In the experiment, a single cylinder rotational viscometer was used for viscosity measurement, and the relationship between changes in the physical properties of the cement paste and its ultrasonic propagation characteristics were discussed. The following conclusions were obtained in this study. In the experiments, apparent viscosity measured with a rotational viscometer increases sharply when the ultrasonic wave velocity remains stable at approximately 1500 m/s. Therefore, within the limits of this study, evaluation of changes in apparent viscosity of cement paste using wave velocity is thought to be difficult. The maximum amplitude ratio is considered to be an ultrasonic wave propagation index that reflects the increase in apparent viscosity associated with changes in physical properties during the setting and hardening of cement paste. The apparent viscosity is an index for evaluating the shear stress resistance of cement paste. Maximum amplitude is therefore a characteristic value of propagation that adequately reflects changes in shear stress resistance. Frequency distribution, like maximum amplitude ratio, is a physical property index for evaluating the shear stress resistance of cement paste. Unlike maximum amplitude, frequency distribution does not depend on elastic wave energy.
Non-destructive testing for evaluation of physical properties in fresh cementitious materials using elastic-wave methods
Zerstörungsfreie Prüfung zur Bewertung physikalischer Eigenschaften in frischen Zementwerkstoffen mittels Elastischer Wellen-Methode
Uchida, S. (author) / Kamada, T. (author) / Rokugo, K. (author)
2006
9 Seiten, 8 Bilder, 11 Quellen
Conference paper
Storage medium
English
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