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http://dx.doi.org/10.14346/JKOSOS.2012.27.6.093

Investigation of Aggregate Size Effect on Cracking Behavior in Concrete Fracture Test using Mechanoluminescent Paint  

Lee, Chang Joon (School of Architecture and Civil Engineering, Kyungpook National University)
Kim, Wha-Jung (School of Architecture and Civil Engineering, Kyungpook National University)
Kim, Ji-Sik (Department of Advanced Materials Engineering, Kyungpook National University)
Jeon, Ki-Yong (School of Architecture and Civil Engineering, Kyungpook National University)
Publication Information
Journal of the Korean Society of Safety / v.27, no.6, 2012 , pp. 93-98 More about this Journal
Abstract
In order to capture the fast crack propagation in an unmanipulated concrete fracture test, we employed mechanoluminascent(ML) material, which emits visible light when stressed, as a crack visualization tool. Three-point bending fracture test setup, a paint type ML material and a high speed camera were used to capture the images of fast moving cracks. The maximum size of coarse aggregates of concrete was used as an experimental parameter. The crack images, loading, and crack mouth opening displacement were successfully recorded as a function of time elapsed. From the test results, several interesting cracking behavior in the unmanipulated fracture test was observed in such that (1) the crack moves fast while the load is slowly decreased after the maximum loading, and (2) the crack in concrete with larger coarse aggregates moves faster than the others.
Keywords
concrete fracture test; mechanoluminescent paint; crack length; visualization;
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