Evaluation of Deterioration of Concrete by Acoustic Emission Method

声发射法评价混凝土的劣化

• 批准号: 04650427
• 负责人: YAMURA Kiyoshi
• 金额: $ 1.28万
• 依托单位: Setsunan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650427/
• 关键词: Acoustic emission; Freezing and thawing action; Alkali aggregate reaction; Deterioration of concrete; Young' modulus; Strength; Kaiser effect; アルカリ骨材発生; アコースティックユミッション

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.

近年来，声发射（AE）技术在诊断工具中的应用在评估混凝土劣化方面引起了人们的广泛关注。本研究研究了在压缩荷载过程中由于冻融作用或碱硅反应而导致劣化混凝土的声发射特性。将结果与评估混凝土劣化的常规参数（例如抗压强度、杨氏模量和膨胀特性）进行了比较。同时，研究了水灰比、混凝土龄期、初载率、初载后存放条件等条件下混凝土的凯塞效应。试验结果表明，低应力混凝土中的AE计数率随着混凝土的劣化发展而变大，最终破坏过程中的AE计数率特征与相同抗压强度的未劣化混凝土几乎相同。 力量。混凝土中的凯塞效应不能清晰地观察到，特别是在混凝土初载龄期较低且初载后存放时间较长的情况下。这些现象被认为可有效地用于评估混凝土的劣化。

项目成果

矢村 潔: "カイザー効果に関する二、三の実験" 平成5年度土木学会関西支部年次学術講演会講演概要集. V-23-1-V-23-2 (1993)

Kiyoshi Yamura：“关于凯撒效应的一些实验”日本土木工程师学会关西分会1993年度学术讲座摘要V-23-1-V-23-2（1993）。

K.Yamura: "AN Experiment on Kanser Effect in Concrete" Proceedings of JSCE Kansai Branch Annual Meeting. V-26-1 - V-26-2 (1992)

K.Yamura：“混凝土中 Kanser 效应的实验”JSCE 关西分会年会论文集。

K.Yamura: "Study on Characteristics of Acoustic Emissions of Damaged Concrete" Proceedings of the JCI. 853-858 (1993)

K.Yamura：“受损混凝土声发射特性研究”JCI 会议记录。

下嶋 一幸: "若材令コンクリートの静的条件下における簡易AE計測" 土木学会第48回年次学術講演会講演概要集. VI. 366-367 (1993)

Kazuyuki Shimojima：“静态条件下新拌混凝土的简单声发射测量”日本土木工程师学会第 48 届学术年会摘要 VI 366-367。

S.Nishibayashi: "Effect of Reactive Fine Aggregate on Expansion Characteristics of Concrete due to Alkali Aggregate Reaction" Proc.of 9th International Conference on Alkali-Aggregate Reaction in Concrete,London. 2. 723-730 (1992)

S.Nishibayashi：“活性细骨料对碱骨料反应引起的混凝土膨胀特性的影响”，第九届混凝土碱骨料反应国际会议论文集，伦敦。