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Detection of cracks in concrete by acoustic emission

: Gries, H.; Sklarczyk, C.; Waschkies, E.

Proceedings of the international Workshop "Testing during concrete construction"
Testing During Concrete Construction <1990, Mainz>
Fraunhofer IZFP ()
acoustic emission; concrete; crack growth; crack surface friction; surveillance

Acoustric emission testing is a method to detect on-line the formation and the growth of cracks and crack-line defects in loaded components and buildings. A large conrete beam has been loaded up to rupture and the acoustic emission (AE) generated thereby has been measured and analysed. It could be shown that it is possible to reveal growing cracks by AE. Futhermore non-growing cracks could also be detected by a weak but measurable AE due to crack friction. Thus it seems to be possible to develop AE-testing as a nondestructive method for on-line monitoring of concrete-buildings.