Abstract
An application of acoustic emission (AE) to the evaluation of deterioration in concrete is studied. AE activity of concrete samples under uniaxial compression is analyzed to estimate the deterioration degree quantitatively. For this purpose, a stochastic analysis of AE activity is introduced. The analysis is performed on concrete newly cast, concrete expanded due to alkali-aggregate reaction, and concrete subjected to freezing-thawing process.
A probability function of AE generating behavior at stress level, V, between 0% and 50% to the compressive strength is represented by an exponential function bVa. It is found that the values a and b distribute in the characteristic zones depending on the deterioration. The variation from the sound concrete is denoted by the deterioration coefficient and the classification of concrete based on the coefficient is proposed.
