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http://dx.doi.org/10.14190/JRCR.2014.2.3.209

Ultrasonic Pulses Characteristics in Lightweight Fine Aggregate Concrete under Various Load Histories  

Yoo, Kyung-Suk (High-speed Railroad Systems Research Center, Korea Railroad Research Institute)
Kim, Jee-Sang (Dept. of Civil & Architectural Engineering, Seokyeong University)
Kim, Ik-Beam (Safety Environment Research Division, The Seoul Institute)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.2, no.3, 2014 , pp. 209-216 More about this Journal
Abstract
One of the widely used NDT(Non-destructive techniques) is the ultrasonic pulse velocity (USPV) method, which determines the travel time of the ultrasonic pulse through the tested materials and most studies were focused on the results expressed in time domain. However, the signal of ultrasonic pulse in time domain can be transformed into frequency domain, through Fast fourier transform(FFT) to give more useful informations. This paper shows a comparison of changes in the pulse velocity and frequency domain signals of concrete for various load histories using lightweight fine aggregates. The strength prediction equation for normal concrete using USPV cannot be used to estimate lightweight fine aggregate concrete strength. The signals in frequency domain of ultrasonic pulse of lightweight fine aggregate concrete does not show any significant difference comparing with those of normal concrete. The increases in stress levels of concrete change the pulse velocities and maximum frequencies, however the apparent relationship between themselves can not be found in this experiment.
Keywords
Non Destructive Testing; Ultrasonic Pulse Velocity Method; Lightweight Fine Aggregates; Replacement Rate;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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