Mostafa M. Geriesh, Ahmed M. R. Fath El-Bab, Hassan A. Mohamadien, Mohsen A. Hassan
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引用次数: 0
Abstract
The quality assessment of concrete material for new or existing buildings is critical to civil and structural engineers. In this scope, the development of nondestructive testing methods (NDT) has received significant attention and becomes essential for enhancing the on-site assessment of concrete performance. The Schmidt hammer (SH) test is one of the most widely used NDT for quantifying concrete strength. However, the reliability of this test and its accuracy are questioned by many researchers. In this study, the measurement quality of SH has been improved by attaching a developed cantilever-based jerk sensor to the SH mass. The theoretical model of the proposed measurement technique has been formulated and discussed. The experimental approach, jerk sensor design, SH body modification, electronic reading unit, testing, and construction of the calibration curves have been presented. Experimental results revealed that the accuracy of the developed SH has increased by 13% for concrete strength measurement, and the correlation coefficient of the strength calibration curve is 0.94. At the same time, the calibration curve of the concrete elasticity modulus showed a 0.93 correlation coefficient with 92% measurement accuracy. Analytical and experimental results have confirmed the applicability of the modified Schmidt hammer since it is reliable and more accurate compared to the traditional Schmidt Hammer.
对土木工程师和结构工程师来说,对新建或现有建筑的混凝土材料进行质量评估至关重要。在这方面,无损检测方法(NDT)的发展受到了极大的关注,并成为加强现场混凝土性能评估的关键。施密特锤(SH)试验是量化混凝土强度最广泛使用的无损检测方法之一。然而,许多研究人员对该测试的可靠性和准确性提出了质疑。在本研究中,通过在 SH 质量块上安装开发的悬臂式挺度传感器,提高了 SH 的测量质量。本研究建立并讨论了拟议测量技术的理论模型。研究还介绍了实验方法、挺举传感器设计、SH 主体改装、电子读取单元、测试和校准曲线的构建。实验结果表明,所开发的 SH 在混凝土强度测量方面的精度提高了 13%,强度校准曲线的相关系数为 0.94。同时,混凝土弹性模量校准曲线的相关系数为 0.93,测量精度为 92%。分析和实验结果证实了改进型施密特锤的适用性,因为与传统的施密特锤相比,改进型施密特锤更可靠、更精确。
期刊介绍:
Journal of Nondestructive Evaluation provides a forum for the broad range of scientific and engineering activities involved in developing a quantitative nondestructive evaluation (NDE) capability. This interdisciplinary journal publishes papers on the development of new equipment, analyses, and approaches to nondestructive measurements.