Determination of anisotropy has crucial to assess the quality of the concrete structures. The signal amplitudes of ultrasonic wave measured on different surfaces of concrete can be used for determining the anisotropy. In this study, a total of 27 cube reinforced concrete samples with different strengths (low, medium and high) have prepared. First, signals of ultrasonic waves (P and S waves) have obtained to use direct measurement technique from two opposite surfaces of the all samples. After, Fast Fourier Transform (FFT) has applied on ultrasonic signals for determining amplitude anisotropies and amplitude ratios. Finally, amplitude anisotropies and ratios have correlated with concrete strength, porosity and reinforcement diameter depending on curing conditions and new equations have developed. In addition, these equations have determined both depending on curing conditions and regardless of curing type. As a result, it has been shown that P and S wave amplitude anisotropies and ratios of reinforced concrete increased with decreasing of concrete strength. These increasing have obtained higher for P wave than that of S wave.

中文翻译：

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不同养护条件下钢筋混凝土振幅各向异性与抗压强度的关系

测定各向异性对于评估混凝土结构的质量至关重要。在混凝土不同表面测量的超声波信号幅度可用于确定各向异性。本研究共制备了27个不同强度（低、中、高）的立方体钢筋混凝土样品。首先，使用直接测量技术从所有样品的两个相对表面获得超声波（P 波和 S 波）信号。之后，快速傅立叶变换 (FFT) 已应用于超声信号以确定幅度各向异性和幅度比。最后，振幅各向异性和比率与混凝土强度、孔隙率和钢筋直径相关，具体取决于固化条件和新方程。此外，这些方程式既取决于固化条件又不考虑固化类型。结果表明，钢筋混凝土的 P 波和 S 波振幅各向异性和比率随着混凝土强度的降低而增加。P波获得的这些增加高于S波。