Air-coupled nonlinear ultrasonic test for reinforced concrete beams

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Document Type

Conference Proceeding

Source Title

IABSE Conference, Kuala Lumpur 2018: Engineering the Developing World - Report

First Page

992

Last Page

997

Publication Date

1-1-2018

Abstract

Air-coupled ultrasonic test is a non-destructive test method for investigating damage in material. In this paper, reinforced concrete beams with one 8-mm diameter rounded bar were casted and tested under four-point bending test with water-cement ratio of 40% and 60%. The transducers were placed and focused on the horizontal surface with induced 3mm notch at the midpoint where maximum tension occurred and crack formation was located. Frequency domain waveform was used specifically to analyze second harmonic generation (SHG). There were two metrics used under the SHG, these were: second harmonic amplitude (SHA) and second harmonic ratio (SHR). The SHR proved to be consistent for both water-cement ratio and it behaved increasing as damage in tension increases. © IABSE Conference, Kuala Lumpur 2018: Engineering the Developing World - Report. All rights reserved.

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Disciplines

Civil Engineering

Keywords

Concrete beams--Testing; Concrete beams—Nondestructive testing; Ultrasonic testing

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