Quantitative Evaluation of Damage in Concrete Based on AE
Hiroshi WATANABE, Yuuji MURAKAMI and Masayasu OHTSU
Abstract:Quantitative estimation of damage in concrete is investigated, introducing acoustic emission (AE) and damage mechanics. The damage of concrete is quantitatively evaluated by carrying out AE measurement in the uni-axial compression test. It is clarified that the process of damage accumulation could be evaluated@by the rate process analysis. A damage parameter is determined from damage mechanics, applying Loland's model to a stress-strain relation. Correlating the variation of the rate with the damage evolution, a procedure to estimate the damage parameter is developed. The feasibility of the procedure is demonstrated by concrete samples damaged due to the freezing and thawing process. Key Words:AE, rate process analysis, damage mechanics, Loland's model, core concrete