Investigation of TRC tensile response by acoustic emission
The fundamental study, based on acoustic signals magnitude, shape and frequency content, discloses the presence of early mortar micro-cracking and assesses the nature of multi-scale damage developed as the ultimate matrix strength is reached. At post-cracking stage, the AE signals are classified to indicate different fracture mechanisms: fibres extension, textile slippage and matrix-fibres debonding.
An inside view of the fracture process on TRC coupons
Digital image correlation is applied as supplementary technique to verify the AE outcome. For the first time in literature, the proposed AE-based methodology fully characterises and provides an inside view of the fracture process on TRC coupons under tension overcoming modelling assumptions that were previously in place.
The study is published in: Cement and Concrete Research Volume 123, September 2019, 105776.