A Fundamental Study to Use Ultrasonic Shear Wave for Quality Control of Concrete

利用超声波剪切波控制混凝土质量的基础研究

• 批准号: 61460178
• 负责人: MATSUFUJI Yasunori
• 金额: $ 4.29万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61460178/
• 关键词: Ultrasonic Shear Wave; Concrete; Controll of Exection Schedule; 凝結試験; 非破壊試験; 凝結過程; 動的ずり弾性率; 動的ずり粘性率

In this study, we investigated the properties of concrete by means of travelling ultrasonic pulsed shear wave. The results are summarized as follows.1. Application for testing method for time of settingThe setting time is defined by the characteristics of the dynamic shear modulus-elapsed time curve. It becumes clear that the setting time, varied with water-cement ratio of the mixture, temperature, admixture, and so on, has a significant meaning for exection schedule of concrete work.2. The characteristics of the ultrasonic shear wave travelled through concreteThe power spectrum of the response function of concrete in the early age is limited in the lower frequency range, and the peak frequency dose not agree with that of the operated frequency. It is found that the phenomena is caused by the characteristics of attenuation coefficient of concrete. That is the curves of attenuation coefficient versus frequency have a minimum at each age, and the point shifts to higher frequency with age.3. Application for non-destructive testing methods of concreteIt is found that the compressive strengh of concrete is estimated accurately by it's dynamic shear modulus of cement paste which is calculated by applicating the theory of elasticity of two phase systems The advantage of this method is that compressive strength of concrete is determined independently of mix or age.

在这项研究中，我们通过行进的超声脉冲剪切波研究了混凝土的特性。结果总结如下1。设置时间的测试方法应用程序设置时间是由动态剪切模量拉动时间曲线的特征定义的。它清楚地表明，与混合物，温度，混合物等水泥比的设定时间不同，对于混凝土工作的出现时间表具有显着含义。2。超声波剪波穿过混凝土响应函数的混凝土响应功能的特征在较低的频率范围内受到限制，峰值频率剂量与操作的频率不一致。发现现象是由混凝土衰减系数的特征引起的。那是衰减系数与频率的曲线在每个年龄段最小，而该点随着年龄的增长而转移到更高的频率。3。发现混凝土的非破坏性测试方法的应用是，混凝土的压缩strengh通过其动态剪切模量准确地估算了水泥糊的动态剪切模量，该模量通过应用两个相系统的弹性理论来计算，该方法的优势是该方法的优势是混凝土的压缩强度独立于混合物或年龄确定。

项目成果

松藤泰典,河上嘉人,渡部嗣道: 日本建築学会研究報告,中国・九州支部,構造系. 第7号・1. 1-4 (1987)

松藤泰典、川上义人、渡边嗣通：日本建筑学会研究报告，中国及九州分会，《结构工程》第 7 期，1. 1-4 (1987)。

松藤泰典, 河上嘉人, 朝日真司, 渡部嗣道: 日本建築学会大会学術講演梗概集. 467-468 (1987)

Yasunori Matsufuji、Yoshito Kawakami、Shinji Asahi、Tsunomichi Watanabe：日本建筑学会会议学术讲座摘要 467-468 (1987)。

松藤泰典, 河上嘉人, 半田啓一, 小川満弘: 日本建築学会大会学術講演梗概集. 685-686 (1986)

Yasunori Matsufuji、Yoshito Kawakami、Keiichi Handa、Mitsuhiro Okawa：日本建筑学会会议学术讲座摘要 685-686（1986）。

松藤泰典, 河上嘉人, 朝日真司, 渡部嗣道: 日本建築学会大会学術講演梗概集. 465-466 (1987)

Yasunori Matsufuji、Yoshito Kawakami、Shinji Asahi、Tsunomichi Watanabe：日本建筑学会会议学术讲座论文集 465-466 (1987)。

Yasunori Matsufuji;Yoshihito Kawakami: Porc. of the 31st Japan Congress on Materials Research.

松藤康典；川上义人：猪肉。