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■  2008年12月9日から12日に京都で開催された19th International Acoustic Emission 
  Symposiumで、桃木研究員が研究開発成果を発表しました。　
　  

  
 日本非破壊検査協会が主催する19th International Acoustic Emission Symposiumが，2008年
12月9日(火)〜12日(金)に京都大学・福井謙一記念研究センターで開催されました．
 当社から，桃木研究員が研究成果を発表しました．
  　　

 
■Acoustic Emission For Characterizing Behavior of Composite Concrete 
 Elements Under Flexure　
　　　　　　　　　
Shohei MOMOKI，Hwakian CHAI，Dimitris G. AGGELIS，Akinobu HIRAMA and Tomoki SHIOTANI


■概要     ：Acoustic emission (AE) measurement was adopted to assess the behavior 
　　　　　　of concrete prismssubjected to flexural loading. Plain concrete specimens 
　　　　　　and those with vinyl fiber-reinforced mortarlayer as composite were prepared. 
　　　　　　Discussions are based on utilizing various AE parameters for investigating 
            the fracture behavior of composite specimens from those of plain concrete 
            specimens, as well as assessing locations of cracking and occurrence of 
            debonding at interface betweenconcrete and fiber-reinforced mortar layer. 
            Part of the assessment was justified by visual inspectioncarried out during 
            the loading tests. Results in general indicated that in terms of fracture
            development, the composite specimens behaved similarly to the plain concrete 
            specimen, with higher flexural strength and possibly higher shear resistance 
            as suggested by AE parameters. 
            Besides, there was no significant interfacial debonding observed throughout 
            the flexural tests, inferring that the bond stayed intact throughout the testing 
            such that the specimens were able to sustain stress sufficiently as a composite 
            element. The AE parameters were found useful indistinguishing between the flexure 
            and shear fracture modes and thus can be utilized as indicators to predict  
            fracture behavior of concrete structures in health monitoring process.

  

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