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標題: 以自感測敲擊組件應用在混凝土淺裂縫及鋼筋保護層厚度之量測
Use of the Impactor with Sensing Device for Measuring Shallow Cracks in Concrete and the Cover Thickness
作者: 陳世賢
關鍵字: Shallow Cracks;混凝土淺裂縫;Cover Thickness;stress wave;鋼筋保護層厚度;應力波
出版社: 土木工程學系

The stress wave techniques applying to measuring both shallow cracks in concrete and the cover thickness of reinforcing bars are well developed. In the current methods, because the start time of the stress waves generated by mechanical impact cannot be obtained directly, we need an additional receiver placed near the impact point to trace back the start time of impact. Thus, two receivers are needed in measurement. In the application of the stress wave method to measuring the shallow cracks in concrete and the cover thickness of reinforcing bars, the error caused by positioning the additional receiver has the most significant influence on the measurement results. Therefore, not only it is necessary to develop a sensible impactor for increasing the experimental precision, but also reduce the instrument cost as well as the manpower.
The objective of this research was to verify the validity and applicability of the sensible impactor for measuring shallow cracks in concrete and the cover thickness of reinforcing bars. The experimental results show that using the sensible impactor indeed increases the precision of test. In addition, the new device provides a better result at measuring quite shallow cracks (20mm). Because the voltage-output waveform obtained from the new device is very sharp, it is easy to identify the start time of impact directly. This is favorable to develop an auto-reading apparatus. Furthermore, the cost of the experimental work and signal analysis can be reduced, and the device can be used conveniently in a relatively small space.
Appears in Collections:土木工程學系所

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