SUZUKI, Tetsuya

USE OF MECHANICAL DATA FOR DAMAGE ESTIMATION OF CONCRETE WATER CANAL WALL IN DISASTER AREAS DUE TO EARTHQUAKE EFFECTS

Abstract eng:
The 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.

Publisher:

Japan Concrete Institute, Tokyo

Conference Title:

Proceedings of the First International Conference on Concrete Sustainability

Conference Title:

First International Conference on Concrete Sustainability

Conference Venue:

Tokyo (JP)

Conference Dates:

2013-05-27 / 2013-05-29

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.