Fracture monitoring of lightweight composite-concrete beams with acoustic emission

Research output: Chapter in Book/Report/Conference proceedingConference paper

Abstract

Lightweight hybrid concrete beams are advantageous in terms of installation, but their mechanical behaviour is not easy to predict due to their heterogeneity. In the present study composite beams made of Textile Reinforced Cement (TRC) reinforced with Carbon Fibre Reinforced Polymer (CFRP) strips and a concrete layer are subjected to bending (Fig. 1). Their fracture behaviour is complicated as they exhibit multiple failure mechanisms: cracking of the cement matrix, debonding of the CFRP and delamination between successive layers of TRC. Herein, their mechanical performance is evaluated and monitored by Acoustic Emission (AE) and Digital Image Correlation (DIC). AE indices show that beams suffering from one major failure mechanism (matrix cracking) exhibit nearly constant AE characteristics throughout the bending experiment. Beams suffering additionally from delaminations exhibit longer AE waveforms of lower frequency compared to the plain cement cracking (see Fig. 2). These tendencies are obvious from the initial part of the test, enabling predictions about the subsequent failure. More importantly and for the first time in related literature, the use of DIC enables to relate AE not only to the final damage pattern and the ultimate failure mechanism but also to the strain field during loading.

Original languageEnglish
Title of host publicationICF 2017 - 14th International Conference on Fracture
EditorsEmmanuel E. Gdoutos
Publisher8th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-8)
Pages330-331
Number of pages2
ISBN (Electronic)9780000000002
Publication statusPublished - 1 Jan 2017
Event14th International Conference on Fracture, ICF 2017 - Rhodes, Greece
Duration: 18 Jun 201720 Jun 2017

Publication series

NameICF 2017 - 14th International Conference on Fracture
Volume1

Conference

Conference14th International Conference on Fracture, ICF 2017
CountryGreece
CityRhodes
Period18/06/1720/06/17

Keywords

  • Acoustic emission
  • Bending
  • Cracking
  • Debonding
  • Digital image correlation
  • Frequency
  • Hybrid beams
  • Rise time

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