Clarification on the Spalling of Concrete Exposed to Fire

关于混凝土遇火剥落的澄清

• 批准号: 17560406
• 负责人: MORIMOTO Hiroaki
• 金额: $ 2.24万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560406/
• 关键词: Concrete; Spalling; Fire; Vapor pressure; Thermal stress; Acoustic emission; 湿度応力

The influences of strength and water content on the spalling of concrete exposed to fire were examined by the experiments, in which vapor pressure, temperature, and AE(Acoustic Emission)arising from cracking were measured. The results obtained by the study are as follows ;1. Vapor pressures of more than 2.2Mpa were measured in the spalling concrete specimens.2. Before the spallins arose, the thermal cracking were observed. The thermal cracks is assumed to have a large influence on the scale of subsequent spalling.3. The spalling with the wet specimens expands from surface toward inside being accompanied by fairly local apalling, meanwhile with the air-dried specimens arises in a region adjacent to the surface at a stretch. This is believed linked to the moisture distribution in the specimens.4. The spalling is assumed to develop due to chain reaction of cracking, explosion of vapor pressure, spalling, redistribution of vapor pressure, re-explosion, re-spalling.5. Measuring of AE can be applied for estimating of the development of the cracking and the spalling.6. AE arose over the whole area of the surface of specimens after 20 to 30 minutes after the beginning of application of heat. More AE counts were measured with the high strength concrete specimens as compared to the normal strength concrete specimens. No meaningful differences in AE counts were observed between the wet specimens and the air-dried specimens.

通过实验检查了强度和水含量对暴露于火的混凝土剥落的影响，在该实验中，测量了由裂纹引起的蒸气压，温度和AE（声发射）。研究获得的结果如下； 1。在剥落的混凝土样品中测量了超过2.2MPa的蒸气压2。在果仁糖出现之前，观察到热裂纹。假定热裂纹对随后的剥落的尺度有很大影响3。带有湿标本的剥落从表面向内部扩展，并伴随着相当局部的插座，同时，在伸展的区域中出现了气干样品。据信这与标本中的水分分布相关。4。假定剥落是由于破裂的链反应，蒸气压的爆炸，剥落，蒸气压的重新分布，重新爆发，重新散布5。 AE的测量可以用于估计裂纹和剥落的发展。6。施加热量后20至30分钟后，AE在标本表面的整个区域上浮出水面。与正常强度混凝土试样相比，用高强度混凝土样品测量了更多的AE计数。在湿标本和气干标本之间没有观察到AE计数的有意义的差异。

项目成果

高温加熱によるコンクリートの爆裂現象に関する実験的研究

混凝土高温加热爆炸现象试验研究

• 发表时间: 2007
• 期刊: コンクリート工学年次論文集 29(印刷中)
• 作者: R. Enomoto;Y. Izue;Y. Yamashita;T. Ono;A. Kumamoto;Y. Kasahara;後藤 由貴;T. Ono;A. Kumamoto;Y. Goto;Y. Kasahara;T. Ono;Y. Miyoshi;Y. Miyoshi;Y. Miyoshi;長野 勇;井町 智彦;後藤 由貴;B. Tsurutani;K. Shiokawa;H. Matsumoto;I. Nagano;T. Imachi;Y. Goto;B. Tsurutani;K. Shiokava;B.Tsurutani;K.Shiokawa;越山 祐一;中嶋 充;長野 勇;Y.Kasahara;Y.Kasahara;Y.Goto;Y.Goto;R.Higashi;Y. Kasahara;Y. kasahara;Y. Kasahara;Y. Goto;Y. Goto;Y. Goto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;Y. Kasahara;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;王若平;小澤満津雄;R.Wang;M.Ozawa;小澤満津雄
• 通讯作者: 小澤満津雄

Experimental study on the spalling of concrete

混凝土剥落试验研究

• 发表时间: 2006
• 期刊: Annual journal of concrete engineering 28-1
• 作者: R. Enomoto;Y. Izue;Y. Yamashita;T. Ono;A. Kumamoto;Y. Kasahara;後藤 由貴;T. Ono;A. Kumamoto;Y. Goto;Y. Kasahara;T. Ono;Y. Miyoshi;Y. Miyoshi;Y. Miyoshi;長野 勇;井町 智彦;後藤 由貴;B. Tsurutani;K. Shiokawa;H. Matsumoto;I. Nagano;T. Imachi;Y. Goto;B. Tsurutani;K. Shiokava;B.Tsurutani;K.Shiokawa;越山 祐一;中嶋 充;長野 勇;Y.Kasahara;Y.Kasahara;Y.Goto;Y.Goto;R.Higashi;Y. Kasahara;Y. kasahara;Y. Kasahara;Y. Goto;Y. Goto;Y. Goto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;Y. Kasahara;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;王若平;小澤満津雄;R.Wang;M.Ozawa;小澤満津雄;王若平;川上寛正;M.Ozawa;R.Wang
• 通讯作者: R.Wang

若材齢コンクリートの熱膨張係数推定法の関する研究

新拌混凝土热膨胀系数估算方法研究

• 发表时间: 2005
• 期刊: セメント・コンクリート論文集 59
• 作者: R. Enomoto;Y. Izue;Y. Yamashita;T. Ono;A. Kumamoto;Y. Kasahara;後藤 由貴;T. Ono;A. Kumamoto;Y. Goto;Y. Kasahara;T. Ono;Y. Miyoshi;Y. Miyoshi;Y. Miyoshi;長野 勇;井町 智彦;後藤 由貴;B. Tsurutani;K. Shiokawa;H. Matsumoto;I. Nagano;T. Imachi;Y. Goto;B. Tsurutani;K. Shiokava;B.Tsurutani;K.Shiokawa;越山 祐一;中嶋 充;長野 勇;Y.Kasahara;Y.Kasahara;Y.Goto;Y.Goto;R.Higashi;Y. Kasahara;Y. kasahara;Y. Kasahara;Y. Goto;Y. Goto;Y. Goto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;Y. Kasahara;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;王若平;小澤満津雄;R.Wang;M.Ozawa;小澤満津雄;王若平;川上寛正;M.Ozawa;R.Wang;H.Kawakami;王若平;MITSUO.OZAWA;王若平;M.Ozawa;小澤満津雄
• 通讯作者: 小澤満津雄

高温加熱よるコンクリートの爆裂現象メカニズムに関する研究

高温加热引发混凝土爆炸机理研究

• 发表时间: 2007
• 期刊: 平成18年度土木学会中部支部研究発表会講演概要集
• 作者: R. Enomoto;Y. Izue;Y. Yamashita;T. Ono;A. Kumamoto;Y. Kasahara;後藤 由貴;T. Ono;A. Kumamoto;Y. Goto;Y. Kasahara;T. Ono;Y. Miyoshi;Y. Miyoshi;Y. Miyoshi;長野 勇;井町 智彦;後藤 由貴;B. Tsurutani;K. Shiokawa;H. Matsumoto;I. Nagano;T. Imachi;Y. Goto;B. Tsurutani;K. Shiokava;B.Tsurutani;K.Shiokawa;越山 祐一;中嶋 充;長野 勇;Y.Kasahara;Y.Kasahara;Y.Goto;Y.Goto;R.Higashi;Y. Kasahara;Y. kasahara;Y. Kasahara;Y. Goto;Y. Goto;Y. Goto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;Y. Kasahara;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;王若平
• 通讯作者: 王若平

A Study on the Method of Estimating Creep of Early-age Concrete

早龄混凝土徐变估算方法的研究

• 发表时间: 2005
• 期刊: Creep, Shrinkage and Durability of Concrete and Concrete Structures, CONCREEP8 8
• 作者: R. Enomoto;Y. Izue;Y. Yamashita;T. Ono;A. Kumamoto;Y. Kasahara;後藤 由貴;T. Ono;A. Kumamoto;Y. Goto;Y. Kasahara;T. Ono;Y. Miyoshi;Y. Miyoshi;Y. Miyoshi;長野 勇;井町 智彦;後藤 由貴;B. Tsurutani;K. Shiokawa;H. Matsumoto;I. Nagano;T. Imachi;Y. Goto;B. Tsurutani;K. Shiokava;B.Tsurutani;K.Shiokawa;越山 祐一;中嶋 充;長野 勇;Y.Kasahara;Y.Kasahara;Y.Goto;Y.Goto;R.Higashi;Y. Kasahara;Y. kasahara;Y. Kasahara;Y. Goto;Y. Goto;Y. Goto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;A. Kumamoto;Y. Kasahara;Y. Kasahara;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;S. Yamawaki;T. Ito;M. Nakashima;Y. Sakai;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;Y. Goto;Y. Kasahara;Y. Kasahara;Y. Goto;R. Higashi;王若平;小澤満津雄;R.Wang;M.Ozawa;小澤満津雄;王若平;川上寛正;M.Ozawa;R.Wang;H.Kawakami;王若平;MITSUO.OZAWA;王若平;M.Ozawa
• 通讯作者: M.Ozawa