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A Methodology Based on Pulse-Velocity Measurements to Quantify the Chemical Degradation Levels in Thin Mortar Specimens

机译:基于脉冲速度测量的量化薄砂浆样品中化学降解水平的方法

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摘要

In this research, ultrasonic pulse echo measurements are used to quantify through thickness chemical degradation in thin mortar specimens. The degradation level is predicted using the time of travel of the acoustic wave through the thickness of the structure. The front and back wall interaction reflections are used to obtain additional information from very early stage degradation. The pulse-velocity of sound waves as a function of the thickness of the layers within the structure is described. With knowledge of the pulse-velocity in pristine and fully degraded conditions, it is possible to determine the complete range of degradation length over the layer thickness. The method is applicable for leaching of calcium and acidic attack. The acoustic measurements were verified with destructive testing. The correlation between the acoustic and non-acoustic experiments agree with the described pulse-velocity and degraded depth function. The method based on ultrasonic measurements can be implemented in other thin-layered structures.
机译:在这项研究中,超声脉冲回波测量被用于量化薄砂浆样品中厚度化学降解的程度。使用声波传播通过结构厚度的时间来预测退化程度。前壁和后壁的相互作用反射可用于从非常早期的退化中获取更多信息。描述了声波的脉冲速度与结构内各层厚度的关系。通过了解原始和完全降解条件下的脉冲速度,可以确定整个层厚度上降解长度的完整范围。该方法适用于钙的浸出和酸性侵蚀。通过破坏性测试验证了声学测量结果。声学和非声学实验之间的相关性与所描述的脉冲速度和降级的深度函数一致。基于超声测量的方法可以在其他薄层结构中实现。

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