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Measuring high speed crack propagation in concrete fracture test using mechanoluminescent material

  • Kim, Wha-Jung (School of Architecture and Civil Engineering, Kyungpook National University) ;
  • Lee, Jae-Min (School of Architecture and Civil Engineering, Kyungpook National University) ;
  • Kim, Ji-Sik (Department of Advanced Materials Engineering, Kyungpook National University) ;
  • Lee, Chang Joon (School of Architecture and Civil Engineering, Kyungpook National University)
  • Received : 2012.02.17
  • Accepted : 2012.09.10
  • Published : 2012.12.25
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Abstract

Measuring crack length in concrete fracture test is not a trivial problem due to high speed crack propagation. In this study, mechanoluminascent (ML) material, which emits visible light under stress condition, was employed to visualize crack propagation during concrete fracture test. Three-point bending test was conducted with a notched concrete beam specimen. The cracking images due to ML phenomenon were recorded by using a high speed camera as a function of time and external loadings. The experimental results successfully demonstrated the capability of ML material as a promising visualization tool for concrete crack propagation. In addition, an interesting cracking behavior of concrete bending fracture was observed in which the crack propagated fast while the load decreased slowly at early fracture stage.

Keywords

Acknowledgement

Supported by : Ministry of Land, Transport and Maritime Affairs, National Research Foundation of Korea

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