- 學位論文
以鋼筋透地雷達影像檢測混凝土內滲漏狀態
Using the B-scan image of steel reinforcement to estimate the leakage problers in reinforced concrete structure
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摘要
研究之目的是研究如何將混凝土滲漏狀況以透地雷達B-scan影像圖中鋼筋反射反應之檢測訊號進行評估，本研究在GprMax2D數值模擬出內含鋼筋之混凝土於不同濕度狀態、不同鋼筋號數、不同鋼筋埋設深度以及混凝土滲漏狀態之透地雷達B-scan影像圖，並由RadExplorer程式利用雙曲線之功能，可找出其狀態下混凝土之波速、雙程走時、及深度，結果顯示由雙曲線計算的波速及深度的結果與設計值相符。在透地雷達檢測混凝土試體滲漏狀態方面，可以藉由多支鋼筋雙曲線訊號推估混凝土介電常數，並繪製檢測面上介電常數的分佈圖，明顯的看出內部滲漏的部分，因此藉由透地雷達是可以明顯找出滲漏之範圍。
並列摘要
The research aims to develop the technologies using GPR B-scan image of reinforcing bar to inspect the condition of leakage in concrete. In this study, the program GprMax2D numerically simulated the GPR B-scan image of reinforced concrete with different humidity state, reinforcing bar size, burial depth and concrete leakage state. The RadExplorer program uses hyperbolic function to find this state velocity, two-way travel time and depth of concrete. The velocity and the depth calculated by the hyperbolic curves are all agree with the designed ones. The distribution of dielectric constants of concrete above the steel bars can be estimate by hyperbolic signals. Drawing distribution of dielectric constant on the testing surface, the position of the internal leakage can clearly be visualized. Therefore, by GPR can clearly identify the range of the leak.
參考文獻
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Measurement radius of reinforcing steel bar in concrete using digital image GPR. Construction and Building Materials 23 (2009)