隨著國內對鋼板橋使用的需求漸增，鋼板橋上的鋪面系統也日漸受到重視。流動性瀝青混凝土（Gussasphalt,簡稱Guss）是一種適用於鋼床板上的鋪面材料，在德國和日本已經廣泛地使用，其高溫下具有流動性，能與鋼鈑一體成形，對鋼床板變形的迎合性較佳，並且具有良好的防水性，而低溫時具有較大的勁度，能提供較佳的耐久性。Guss的瀝青含量較一般瀝青混凝土高，並且添加的較多的石粉，此外，Guss的黏結料添加了一種特殊的瀝青材料，千里達湖瀝青（Trinidad Lake Asphalt, T.L.A.），因此Guss的強度主要取決於黏結料和填充料所組成的膠漿，本研究主要針對Guss膠漿的基本性質做分析與討論，試驗包含軟化點試驗、黏度試驗、質流試驗、韌性試驗、SEM電子顯微鏡觀測和EDS元素分析。
由實驗結果得知，T.L.A.和石粉含量的增加以及拌和時間造成的老化都會使膠漿的勁度上升，但老化對相位角造成的影響比T.L.A.和石粉含量對相位角的影響明顯；使用pen20/40和AR8000作為主要黏結料拌和T.L.A.後在膠漿的性質也有所差異，AR8000和T.L.A.以重量比70：30拌和後60℃黏度為9380 poise，仍然比純pen20/40之60℃黏度15700 poise低；此外，本研究建立膠漿之老模型，可以對老化瀝青膠漿之質流性質作系統性的整理並減少試驗數量。

Many steel bridge have been used in Taiwan, the paving system on the steel bridge have been important. Gussasphalt, a paving material used on the steel bridge deck, it be used in Germany and Japan generally. When heated to high temperatures, Gussasphalt is a pourable bitumen mastic, it can be bond to the steel deck to provide composite action and prevent the steel deck contacted water. The strength of Gussasphalt is mainly provided by mastic which compose of binder and filler, because the asphalt and filler content of Gussasphalt is more than generally asphalt concrete, and binders used can include conventional asphalt, Trinidad Lake asphalt (T.L.A.). The study is discussed and analyzed the mastic properties in Gussasphalt. The test items include soften point test, viscosity test, dynamic shear rheometer(DSR) test, toughness test , Scanning Eletron Miroscope(SEM) observation, and Energy Dispersive Spectrometer(EDS) element analysis.
The obtained results show adding T.L.A. and filler in mastic and aging may increase mastic stiffness, but the influence of aging in phase angle is more obvious than the influence of adding T.L.A. and filler to the mastic. The mastic properties of AR8000 mixing T.L.A. and pen20/40 mixing T.L.A. is different. Build the rheometer aging master curve of mastic could reduce the test times.

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