000002136 001__ 2136
000002136 005__ 20141118153441.0
000002136 04107 $$acze
000002136 046__ $$k2013-05-27
000002136 100__ $$aSUZUKI, Tetsuya
000002136 24500 $$aUSE OF MECHANICAL DATA FOR DAMAGE ESTIMATION OF CONCRETE WATER CANAL WALL IN DISASTER AREAS DUE TO EARTHQUAKE EFFECTS

000002136 24630 $$n1.$$pProceedings of the First International Conference on Concrete Sustainability
000002136 260__ $$bJapan Concrete Institute, Tokyo
000002136 506__ $$arestricted
000002136 520__ $$2eng$$aThe Great East Japan Earthquake hit Tohoku Area in Japan on March 11, 2011. A large number of concrete structures were damaged by the 9.0 magnitude earthquake in Richter-scale. In disaster areas, after the earthquake, damage evaluation of in-situ concrete is now in urgent demand. In this study, quantitative estimation of spatial damage of concrete is going to be performed, applying acoustic emission (AE) measurement in the compression test of core samples and estimated dynamic Young’s modulus using P wave velocity. The procedure is named DeCAT (Damage Estimation of Concrete by Acoustic Emission Technique), which is based on estimating an intact modulus of elasticity in concrete. Distribution of micro-cracks in a concrete-core sample is inspected by helical X-ray computer tomography (CT) scans at one-millimeter intervals. Then, damaged samples are evaluated based on AE generating behaviors due to fracturing under compression, which is analyzed by damage mechanics. It is demonstrated that the decrease in mechanical properties could be evaluated by comparing an average CT number with a rate of AE generation, which is analyzed by the AE rate process. A relation between AE rate and damage parameters is correlated. Thus, by calculating initial Young’s modulus from the DeCAT system, the spatial damage of concrete is quantitatively estimated.

000002136 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000002136 653__ $$aconcrete damage, AE, spatial analysis, DeCAT, P wave, dynamic Young’s modulus

000002136 7112_ $$aFirst International Conference on Concrete Sustainability$$cTokyo (JP)$$d2013-05-27 / 2013-05-29$$gICCS13
000002136 720__ $$aSUZUKI, Tetsuya
000002136 8560_ $$ffischerc@itam.cas.cz
000002136 8564_ $$s1008391$$uhttp://invenio.itam.cas.cz/record/2136/files/S2-4-6.pdf$$y
             Original version of the author's contribution as presented on CD, .
            
000002136 962__ $$r2053
000002136 980__ $$aPAPER