Fracture processes imaging in concrete using nonlinear ultrasound

Abstract This paper shows the complementarity of two nonlinear ultrasonic imaging methods to characterize closed macro cracks in concrete. A time reversal mirror is used locally probe and image nonlinearity a cracked region. Two parameters are extracted map The obtained using first parameter relates harmonic generation due contact frictional behaviors at crack lips, correlated with vibro-thermography same crack. second based on conditioning material induced by distributed micro arising from fracture process zone. These results show great potential for characterization processes concrete, possibility uncouple effects itself surrounding damage.