Acoustic emission analysis for the quantification of autonomous crack healing in concrete

Kim Van Tittelboom, Nele De Belie, Frank Lehmann, Christian U. Grosse

Research output: Contribution to journalArticlepeer-review

149 Scopus citations

Abstract

As half of the annual construction budget is spent on remediation of existing structures, self-healing of concrete, which is very sensitive to cracking, would be highly desirable. In this research, encapsulated healing agents were embedded in the concrete matrix in order to obtain self-healing properties. Upon cracking, the capsules break and the healing agent is released, resulting in crack repair. The efficiency of this crack healing technique was evaluated by means of mechanical tests and by using acoustic emission analysis. It was shown that due to autonomous crack repair, more than 80% of the original strength and stiffness can be regained. Events with an energy higher than the energy related to concrete cracking indicated breakage of the capsules. Upon reloading of beams with untreated cracks, the released energy was lower compared to beams with healed cracks. From this study it was shown that AE is a suitable technique to evaluate self-healing of cracks in concrete.

Original languageEnglish
Pages (from-to)333-341
Number of pages9
JournalConstruction and Building Materials
Volume28
Issue number1
DOIs
StatePublished - Mar 2012

Keywords

  • Ceramic tubes
  • Mechanical properties
  • Non-destructive testing
  • Polymers
  • Self-healing concrete

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