Evaluation of Deterioration of Concrete by Acoustic Emission Method

点击翻译按钮获取中文摘要

Recently, Applications of acoustic emission (AE) technology to diagnostic tools attract great attention for the evaluation of deterioration of concrete.In this study, AE characteristics of deteriorated concrete due to freezing and thawing actions or alkali silica reaction, during compressive loading were investigated. The results were compared with conventional parameters for evaluating the deterioration of concrete, such as compressive strength, Young's modulus and expansion characterisics. At the same time, Kaiser effect in concrete under several conditions of water cement ratio, concrete age, rate of initial loading and storing condition and term after initial loading were investigated.The experimental results show that AE count rate in low stress lovel becomes large according to the deterioratin of concrete develope, and the AE count rate characteristics in the process of final failure are almost the same as that of the non-deteriorated concrete having the same compressive strenght. Kaiser effect in concrete can not be observed clearly especially in the case that the age of concrete at initial loading is low and the term of storing arter initial loading is long. These phenomena are considered to be used effectively for evaluation of deterioration of concrete.