Title:
Impact-Echo Method
Author(s):
Mary Sansalone and Nicholas J. Carino
Publication:
Concrete International
Volume:
10
Issue:
4
Appears on pages(s):
38-46
Keywords:
concretes; finite element method; impact-echo method; impact tests; nondestructive tests; stress waves; Structural Research
DOI:
Date:
4/1/1988
Abstract:
The impact-echo method for nondestructive testing of concrete was successfully used to locate honeycombed concrete and an ungrouted metal duct and to determine the depth of vertical surface-opening cracks in concrete. The studies were carried out on laboratory specimens that contained artificial flaws at known locations. Frequency analysis of recorded surface displacement waveforms was used to determine the location of the various flaws. Finite element studies of the transient impact response of a solid containing simulated honeycombing were also carried out to gain an understanding of transient wave propagation through such a solid.