對鋪築於鋼鈑橋之流動性瀝青混凝土（Guss）進行鑽心試驗將會造成鋼鈑橋橋面損壞，以及留下侵害之弱面，須以非破壞性檢測方法，進行鋪面密度品質控制。以電磁波原理應用於非破壞性檢測過程中，介電常數為影響電磁波行為之重要參數，本研究使用網路分析儀搭配終端開路同軸探棒（Open-Ended Coaxial Probe），量測Guss膠漿，粒料，和Guss試體之介電常數，以2.55GHz頻率之介電常數數值探討孔隙率，密度，瀝青含量，以及溫度變化對於介電常數之影響。另發展Guss瀝青混凝土介電混合模型與介電常數預測密度模型，並且使用電磁式密度儀PaveTracker量測Guss瀝青混凝土密度，並以校正後之PaveTracker數值與實驗室密度加以比較。
　　試驗結果顯示孔隙率和密度與介電常數呈線性關係，R2約為0.6。對於Guss試體而言，瀝青含量對介電常數影響並不明顯。在溫度量測範圍90℃至60℃的降溫過程當中，Guss試體介電常數隨溫度下降而減少。另由本研究所發展的Guss試體介電混合模型，以膠漿，粒料，石粉和空氣之介電常數及所佔之體積百分比，可推測Guss試體之介電常數。並且由所建立之密度預測模型，以Guss試體介電常數預測密度，密度預測值與實驗室密度之相關性R2為0.78。最後以校正電磁式密度儀PaveTracker讀數，校正後PaveTracker讀數與實驗室密度之相關係數R從0.38提升到0.89，為可接受之數值。

For the quality of pavement density, the core test of Guss asphalt on an orthotropic steel deck bridge would damage the deck, and the location after that test would be a weakness for erosion, so need to use a non-destructive pavement density measurement. The process of non-destructive methods by an electromagnetic way, the dielectric constant is one of the most important parameters to influence behavior of an electromagnetic way. This study measured the dielectric properties of Guss mastic, aggregate, and Guss asphalt specimens by network analyzer and an open-ended coaxial probe, and discussed the relationship between the dielectric constant and air void, density, bitumen content, and temperature at 2.55GHz frequency range. Then this study established the dielectric mixing model and the density predicting model, and furthermore measured density of Guss asphalt specimens by the nonnuclear pavement density gauge PaveTacker, then the PaveTacker value after calibration was compared with measured value.
The results showed linear relationship between air void and the dielectric constant, density and the dielectric constant, and R2 was about 0.6. The influence of bitumen content on the dielectric constant was not significant. In temperature range, the dielectric constant of Guss asphalt specimens decreased with the cooling of temperature in 90C to 60C. As for the dielectric mixing model of Guss asphalt, the dielectric constant value of the specimens was calculated by the dielectric constant and volume fraction of Guss mastic, aggregate, pulverized limestone, and air. And for the density predicting model of Guss asphalt, the density value of Guss asphalt was calculated by the dielectric constant value, R2 of the regression of the density value by calculating of the density value by measured was 0.78. Moreover, this study calibrated the nonnuclear pavement density gauge PaveTacker value, and R of the regression of the PaveTracker value after calibration of the density value by measured was raised 0.89 from 0.38.

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