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Characterization of cement materials by ultrasonic attenuation
The existence of cement composites with premature deterioration due to ambient conditions demands procedures to estimate the durability of this type of materials. The durability of cement composite structures and their mechanical properties are related to the porous structure, which determines the intensity of interactions of the material with aggressive agents. The porous structure is usually characterized by destructive testing methods. In this work, an ultrasonic non-destructive technique to estimate the porosity of cement composites is presented, which is based on the spectral analysis of the material attenuation. Experimental tests are applied to prismatic samples of cement paste, whose porosity has been varied by two complementary ways, first varying the water cement ratio from 0.4 to 0.5 and, second, using two cement qualities of compressive strength 32.5 and 42.5 N/mm2, respectively. Measurements have been made using wide band ultrasonic transducers, which cover the frequencies between 2 MHz and 10 MHz. Experimental work shows that there is a linear correlation between porosity and the slope of the attenuation coefficient related to the square of the frequency.
Characterization of cement materials by ultrasonic attenuation
The existence of cement composites with premature deterioration due to ambient conditions demands procedures to estimate the durability of this type of materials. The durability of cement composite structures and their mechanical properties are related to the porous structure, which determines the intensity of interactions of the material with aggressive agents. The porous structure is usually characterized by destructive testing methods. In this work, an ultrasonic non-destructive technique to estimate the porosity of cement composites is presented, which is based on the spectral analysis of the material attenuation. Experimental tests are applied to prismatic samples of cement paste, whose porosity has been varied by two complementary ways, first varying the water cement ratio from 0.4 to 0.5 and, second, using two cement qualities of compressive strength 32.5 and 42.5 N/mm2, respectively. Measurements have been made using wide band ultrasonic transducers, which cover the frequencies between 2 MHz and 10 MHz. Experimental work shows that there is a linear correlation between porosity and the slope of the attenuation coefficient related to the square of the frequency.
Characterization of cement materials by ultrasonic attenuation
Charakterisierung von Zementwerkstoff mittels Schallschwächung
Hernandez, M.G. (author) / Anaya, J.J. (author) / Ullate, L.G. (author) / Cegarra, M. (author)
2002
8 Seiten, 7 Bilder, 1 Tabelle, 6 Quellen
Conference paper
Storage medium
English
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