Elastic Wave Property of Concrete Decomposed by Steam Pressure Cracking Agent
Elastic Wave Property of Concrete Decomposed by Steam Pressure Cracking Agent
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DOI：
10.32732/jma.2022.11.2.37
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
O. Kamiya;Etsushi Okuyama;Mamoru Takahashi;Y. Miyano;S. Ito;Kenji Murata;Junpei Nanao;Arata Maisawa;M. Kawano;Takashi Kazumi;M. Nakatsu;H. Mizuma;Y. Iwama
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文献类型：
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作者：
O. Kamiya;Etsushi Okuyama;Mamoru Takahashi;Y. Miyano;S. Ito;Kenji Murata;Junpei Nanao;Arata Maisawa;M. Kawano;Takashi Kazumi;M. Nakatsu;H. Mizuma;Y. Iwama
蒸汽压力裂解（SPC）剂是一种可以安全、快速地拆除混凝土的方法。在之前的研究中，作者表明裂纹的方向可以由感应孔处的拉应力控制，而不是由 SPC 孔处的压应力控制。我们证明，当波在感应孔的自由表面反射时，压缩弹性波变为拉伸波。我们还通过开发即使在高温、潮湿和辐射环境下也难以损坏的弹性波测量系统来检查混凝土的性能。四种混凝土类型的弹性波速变化小于4%。结果发现标准偏差值 σ 改变了四次。因此，可以使用标准偏差值σ来确定混凝土内部结构的劣化，该标准偏差值表示弹性波速度的分散性。
A steam pressure cracking (SPC) agent is a method that can dismantle concrete safely and quickly. In previous studies, the authors showed that the direction of the crack could be controlled by the tensile stress at the induction holes and not by the compressive stress at the SPC hole. We demonstrate that the compression elastic wave changes to a tensile wave when the wave is reflected at the free surface of the induction hole. We also examined the properties of the concrete by developing an elastic wave measuring system that is difficult to break down even in high-temperature, wet, and radiation environment. The elastic wave velocity change in the four concrete types was less than 4%. It was found that the standard deviation value, σ, changed four times. Therefore, it is possible to determine the deterioration of the internal structure of concrete using the standard deviation value σ, which indicates the dispersion of the elastic wave velocity.