敲擊回音法檢測混凝土版修補狀況之研究

Study on the Reparing Condition in Concrete Slab Detected by the Impact-echo Method

郭慶斌(Ching-Ping Kuo)

指導教授 ： 吳志興

國立屏東科技大學/工學院/土木工程系所/碩士(2012年)

https://doi.org/10.6346/NPUST.2012.00236

摘要

本研究以敲擊回音法量測壓力波速檢測混凝土版修補狀況，使用20 mm鋼球和小鐵鎚作為敲擊源來量測20 cm和30 cm版厚試體之波速值，並與超音波對打波速值作比較，藉以探討以波速量測值來評估修補品質之可行性。
試驗結果顯示，敲擊回音法20 mm鋼球和小鐵鎚與超音波量測之波速等位線圖具有一致性。20 cm版厚試體之4 cm、6 cm 修補深度之中央修補區和4 cm、6 cm、8 cm、10 cm邊緣修補區之波速值偏低，皆顯示此等區域修補不良。8 cm、10 cm中央修補區之波速值正常，顯示修補良好。30 cm版厚試體之12 cm、14 cm、16 cm、18 cm中央修補區與邊緣修補區之波速值正常，亦皆顯示修補良好。此結果顯示，以敲擊回音法檢測版狀混凝土版之修補狀況是可行的。

關鍵字

敲擊回音法 ； 超音波 ； 非破壞檢測 ； 混凝土版 ； 修補品質 ； 壓力波

並列摘要

The thesis studied the reparing condition in concrete slab using the pressure wave velocity measuring by the impact-echo method. A 20 mm steel ball and a small hammer were used as impacting sources. The wave velocities on concrete slab spcimens of 20 cm and 30 cm thickness were measured. The measured values were compared with those measured by the ultrasonic wave method. The feasiblity of evaluating the reparing quality using the measured velocities was disscussed from the measured results.
The test results showed that the contour diagram of wave velocity using the 20 mm steel ball and small hammer by the impact-echo method were consistent with that by ultrasonic method. The velocities of the central reparing areas of 4 cm and 6 cm depths on the 20 cm slab specimen were all too low. The velocites of the edge reparing areas of 4 cm, 6 cm, 8 cm, 10 cm dethps were too low. The results showed the reparing condition on these ares were poor. The velocities of the central reparing areas of 8 cm and 10 cm depths were normally. The result showed the reparing condition on these ares were good. The velocities of the central and edge reparing areas of 12 cm, 14 cm, 16 cm, 18 cm dethps on the 30 cm slab specimen were normal. The result showed the reparing condition on these ares were good.too low. These results show that, evaluating the reparing condition using the measured velocities by the impact-echo method is feasible.

並列關鍵字

impact-echo method ； ultrasonic wave ； nondestructive testing ； concrete slab ； reparing condition ； pressure wave

參考文獻

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