Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Micromechanical assessment of ultrasound velocity in entrained air cement paste
This article deals with the correlation between porosity and ultrasonic wave velocities of dry entrained air cement paste material. In order to vary the cement paste macroscopic porosity, an entrained air admixture was used within the studied samples. The water content was maintained constant by fixing the water/cement ratio to 0.4 in all samples. Based on the micromechanical modeling of a two-phase composite, the mechanical (bulk and shear moduli) and ultrasonic (longitudinal and transverse velocities) properties of the dry entrained air cement paste material were determined. Both longitudinal and transverse velocities were measured accurately using a setup specially designed for the study. First, the experimental and micromechanical obtained results showed that the correlation between acoustic and hydraulic parameters follow the expected trends. Longitudinal and transverse velocities decrease with macroporosity. Secondly, the dilute inclusion and the Mori-Tanaka models provided good estimations of the acoustic parameters of the air entrained cement paste, for low macroporosity under 10%. Finally, the self-consistent model succeeded in describing the dry air entrained acoustic parameters for all the considered macroporosity.
Micromechanical assessment of ultrasound velocity in entrained air cement paste
This article deals with the correlation between porosity and ultrasonic wave velocities of dry entrained air cement paste material. In order to vary the cement paste macroscopic porosity, an entrained air admixture was used within the studied samples. The water content was maintained constant by fixing the water/cement ratio to 0.4 in all samples. Based on the micromechanical modeling of a two-phase composite, the mechanical (bulk and shear moduli) and ultrasonic (longitudinal and transverse velocities) properties of the dry entrained air cement paste material were determined. Both longitudinal and transverse velocities were measured accurately using a setup specially designed for the study. First, the experimental and micromechanical obtained results showed that the correlation between acoustic and hydraulic parameters follow the expected trends. Longitudinal and transverse velocities decrease with macroporosity. Secondly, the dilute inclusion and the Mori-Tanaka models provided good estimations of the acoustic parameters of the air entrained cement paste, for low macroporosity under 10%. Finally, the self-consistent model succeeded in describing the dry air entrained acoustic parameters for all the considered macroporosity.
Micromechanical assessment of ultrasound velocity in entrained air cement paste
Mikromechanische Bewertung der Ultraschallgeschwindigkeit in Luft-Zementpastenmischungen
Maalej, Sirine (Autor:in) / Lafhaj, Zoubeir (Autor:in) / Bouassida, Mounir (Autor:in)
2010
6 Seiten, 3 Bilder, 1 Tabelle, 20 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
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