The quality of concrete can be primarily judged by its compressive strength. Numerous methods of non-destructive testing (NDT) have been developed to approximate the compressive strength of in situ concrete. Schmidt's rebound hammer and ultrasonic pulse velocity methods are frequently used. In the study reported in this paper, both methods were applied and correlated with destructive testing of concrete. The focus of the study was on developing the NDT relationships for concrete made with coarse aggregates consisting of different mixtures of stone and brick aggregates. The correlation between Young's modulus (static, dynamic and shear) and longitudinal pulse velocity was also incorporated for evaluating complete features of the concrete. A number of experiments followed by statistical analyses was made to achieve the same result.

中文翻译：

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使用无损检测评估由石头和砖块骨料制成的混凝土

混凝土的质量主要取决于其抗压强度。已经开发出许多非破坏性测试（NDT）的方法来近似现场混凝土的抗压强度。施密特的回弹锤和超声脉冲速度方法是经常使用的。在本文报道的研究中，两种方法均被应用，并且与混凝土的破坏性试验相关。研究的重点是开发由粗骨料制成的混凝土的无损检测关系，该粗骨料由不同的石材和砖骨料混合物组成。还结合了杨氏模量（静态，动态和剪切）与纵向脉冲速度之间的相关性，以评估混凝土的整体性能。进行大量实验，然后进行统计分析，以达到相同的结果。