Evaluation of time-dependent-changes of properties of concrete by ultrasonic transfer function analysis

通过超声波传递函数分析评估混凝土性能随时间的变化

• 批准号: 04650526
• 负责人: MATSUFUJI Yasunori
• 金额: $ 1.28万
• 依托单位: KYUSYU 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-04650526/
• 关键词: concrete; setting process; ultrasonic; transverse wave; transmitting velocity; absorption coefficient; dynamic shear modulus of elasticity; dynamic shear modulus of viscosity; 凝結; 強度; 縦波

The purpose of this study was to grasp the properties from fresh to hardened concrete by analyzing the undulation of ultrasonic transversal wave. Many results concerning this evaluating method for quality control of concrete were obtained as follows.1. Finit element analysis by elastic and viscous modelTransmitting of ultrasonic transverse wave inside fresh mortar was simulated by finite element method using elastic and viscous model. According to this analysis, transmitting velocity and absorption coefficient were analyzed from dynamic shearing modulus of elasticity and viscosity. They were corresonded to the values measured by experiments.2. Non-destructive testing method of cold joint occurenceSpecimens include cold joint due to delay fo placing joint were made in experiment, and the effects of cold joint to transmitting of ultrasonic transverse wave were examinated. In consequence, difference of absorption coefficient due to cold joint was observed.3. Applicability of this methodIn experiments, effects of mix proportion, material and curing temperature examinated. And it was clarified that time-dependent-change of transmitting velocity and absorption coefficient corresponded to that of setting, though they were greatly affected by above mentioned items. Thus, it was confirmed that this method was applicable to quality control for many kinds of concrete.

本研究的目的是通过分析超声波横波的波动来掌握从新拌混凝土到硬化混凝土的性能。该混凝土质量控制评价方法的主要研究结果如下： 1．弹性粘性模型有限元分析采用弹性粘性模型，采用有限元方法模拟了超声波横波在新鲜砂浆内的传播。根据该分析，从动态剪切弹性模量和粘度分析了传输速度和吸收系数。与实验测得的值相对应。 2．冷接发生的无损检测方法实验中制作了因延迟放置接头而产生冷接的试件，考察了冷接对超声波横波传播的影响。由此观察到由于冷接引起的吸收系数的差异。 3．该方法的适用性在实验中，考察了混合比例、材料和固化温度的影响。并明确了传输速度和吸收系数随时间的变化与设置的变化相对应，尽管它们受上述因素的影响很大。证实该方法适用于多种混凝土的质量控制。

项目成果

Hitoshi Hamasaki: "A basic study on evaluation of concrete properties through the setting process by characteristics of ultrasonic transverse pulse propagating (Part 2)The effect of curing temperature" SUMMARIES OF TECHNICAL PAPERS OF ANNUAL MEETING, ARCH

Hitoshi Hamasaki：“通过超声波横向脉冲传播特性通过凝结过程评估混凝土性能的基础研究（第 2 部分）养护温度的影响”年会技术论文摘要，ARCH

山口 健太郎: "超音波の波動伝達関数によるコンクリートの凝結硬化性状評価に関する基礎的研究(その2)養生温度がモルタル試験体の伝達関数に及ぼす影響" 日本建築学会大会学術講演梗概集. 1993-A. 1203-1204 (1993)

山口健太郎：《利用超声波传递函数评价混凝土凝结和硬化性能的基础研究（第2部分）养护温度对砂浆试件传递函数的影响》日本建筑学会会议学术讲座摘要。 A.1203-1204 (1993)

Hitoshi Hamasaki: "A basic study on evaluation of concrete properties through the setting process by characteristics of ultrasonic transverse pulse propagating (Part 1) The effect of water cement ratio" SUMMARIES OF TECHNICAL PAPERS OF ANNUAL MEETING, ARC

Hitoshi Hamasaki：“通过超声波横向脉冲传播特性通过凝结过程评估混凝土性能的基础研究（第 1 部分）水灰比的影响”年会技术论文摘要，ARC

Kentaro Yamaguchi: "Basic study on valuation of dynamic modulus of elasticity and viscosity of concrete (Part 1) Examination of evaluation method" SUMMARIES OF TECHNICAL PAPERS, KYUSHU BRANCH OF ARCHITECTURAL INSTITUTE OF JAPAN. No.34-1. 13-16 (1994)

Kentaro Yamaguchi：“混凝土动态弹性模量和粘度评估的基础研究（第 1 部分）评估方法的检验”日本建筑研究所九州分会技术论文摘要。

山口 健太郎: "超音波によるコンクリートの動的せん断粘弾性係数の評価に関する基礎的研究(その1 評価法の検討)" 日本建築学会九州支部研究報告. 34-1. 13-16 (1994)

山口健太郎：“利用超声波评价混凝土动剪切粘弹性系数的基础研究（第1部分：评价方法的研究）”日本建筑学会九州分会研究报告34-1（1994）。