A comparison of acoustic emission, ultrasonic testing using embedded transducers and digital image correlation for the monitoring of crack propagation in concrete

Eleni Tsangouri, Grigorios Karaiskos, Dimitrios Angelis, Danny Van Hemelrijck, Arnaud Deraemaeker

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

Abstract

Crack formation is the main cause of concrete mechanical properties degradation. Autonomous self-healing (i.e.SH) encapsulation systems promise material recovery by filling the cracks with healing agent (providing healing and sealing). The cracking of concrete elements is experimentally investigated by mode-I failure tests in small-dimensioned concrete beams subjected to three-point bending tests. The perplexing fracture process phenomena require an advanced monitoring system. In this study, an optical method (i.e. Digital Image Correlation- DIC), Acoustic Emission (i.e. AE) and an ultrasonic wave propagation technique based on embedded piezoelectric transducers, are combined in order to evaluate the crack formation and opening of three concrete beams in which embedded SH encapsulated system is applied. The loading is applied in two stages. The initial loading is responsible for the crack initiation and formation as well as for the
SH capsules breakage. After the healing agent is released and dried, the concrete samples are reloaded. The DIC technique calculates the crack opening and visualizes the crack formation and propagation path. In parallel, the features extracted by the AE technique quantify the fracture process at different loading stages and detect the regions in which healing occurs by indicating the SH capsule breakage. Finally, a few couples of low-cost PZT transducers based on the concept of Smart Aggregates (i.e. SMAGs) are embedded in the concrete beams for the estimation of the state of damage. Incorporation of the aforementioned fracture analysis provides a full-field view of concrete failure performance and is the keystone to characterize healing performance.
Original languageEnglish
Title of host publication9th International Conference on Structural Dynamics (EYRODYN 2014)
Subtitle of host publicationFaculty of Engineering
Place of PublicationPorto, Portugal
PublisherPorto University, Faculty of Engineering
Pages2221-2229
Number of pages9
ISBN (Print)9727521657
Publication statusPublished - 2014
Event9th International Conference on Structural Dynamics, Eurodyn 2014 - Porto, Portugal
Duration: 30 Jun 20142 Jul 2014

Conference

Conference9th International Conference on Structural Dynamics, Eurodyn 2014
CountryPortugal
CityPorto
Period30/06/142/07/14

Keywords

  • concrete healing
  • encapsulated agent
  • release
  • acoustic emission
  • digital image correlation
  • smart aggregates

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