Research Articles | Challenge Journal of Concrete Research Letters

AE-SiGMA Analysis in Brazilian Test of Concrete

M. Mondoringin, S. Nozaki, M. Ohtsu
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Abstract


The moment tensor analysis of AE waveforms has been developed and is now available for identifying crack kinematics of a location, a crack-type and a crack orientation in a material.   The procedure has been implemented as the SiGMA analysis.  Mechanisms of cracking can be visually and quantitatively studied at the meso-scale in concrete. Since the tensile strength of concrete is normally evaluated by the Brazilian test.  Mechanisms of macro-scale tensile failure in concrete are clarified as the cracking process at the meso-scale determined by the SiGMA analysis.  Evolution of the fracture process zone under the combination of tensile and compressive stresses is discussed.

Keywords


acoustic emission; SiGMA analysis; concrete; tensile strength; Brazilian test

References


Timoshencko, S. P. and Goodier, J. N. Theory of Elasticity, 1907, McGraw-Hill Book Company, New York.

Ohtsu, M., Okamoto, T. and Yuyama, S. Moment Tensor Analysis of AE for Cracking Mechanisms in Concrete, ACI Structural Journal, 1998, 95(2): pp. 87-95.

Akita, H., Koide, H. and Tomon, M. Uniaxial Tensile Test of Unnotched Specimens under Correcting Flexure, Fracture Mechanics of Concrete Structures, Aedificatio Publishers, Freiburg, 1998, 1: pp. 367- 377.

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