Journal
CEMENT & CONCRETE COMPOSITES
Volume 28, Issue 1, Pages 57-68Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2005.08.003
Keywords
stress wave; impact-echo method; non-destructive testing; lightweight aggregate; one-sided wave velocity
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This study investigates the variation of engineering properties and wave velocities of two kinds of lightweight aggregate concretes by non-destructive stress wave propagating testing methods. Both cylindrical specimens and plate specimens at ages of 7, 14, 28 and 56 days were studied. Experimental results show that, at ages from 7 to 56 days, the average strengths and moduli of elasticity of concrete cylinders increase by 25-37%, while the average ultrasonic pulse velocities increase only by 5-7%. The dynamic moduli of elasticity of concrete cylinders are higher than the static moduli of elasticity by about 41% in average, and both have a very close correlation with their corresponding ultrasonic pulse velocities. P-wave velocities across the section of concrete plates from the top to the bottom faces vary about 14-15% by linear extrapolation. Except for the concrete plate at age of 7 days, P-wave velocities measured at the top face of concrete plate by one-sided velocity method are smaller than those by impact-echo method by 2-5%. (c) 2005 Elsevier Ltd. All rights reserved.
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