本研究針對含邊緣裂縫之高鋁水泥(Calcium Aluminate Cement)試體，進行反平面剪力試驗以量測III型斷裂韌度。本研究之實驗條件為無圍壓及簡單荷重加載下，進行一套室內III型斷裂試驗程序，設計三種加載方式，分別為90o環狀邊緣加載、70o環狀邊緣加載及裂縫表面加載，探討III型斷裂韌度與其他力學性質之關聯性。
本研究之高鋁水泥，其Al2O3含量約為40%，以水灰比為0.4拌製純水泥漿，試體分成25℃、200℃、400℃三組溫度歷時，於指定溫度鍛燒24小時，待其降至25℃之後進行試驗，量測其密度、動態泊松比、III型斷裂韌度、單軸壓縮強度、壓入硬度指數、彎矩破壞模數。
本研究發現：70o環狀邊緣加載為可靠穩定之III型斷裂韌度量測方式，高鋁水泥經過鍛燒之後，其密度、動態泊松比、III型斷裂韌度、單軸壓縮強度、壓入硬度指數、彎矩破壞模數皆有下降之趨勢，III型斷裂韌度的下降情形與彎矩破壞模數較為接近，動態楊氏係數呈現先升後降的趨勢。

To measure the mode III fracture toughness (KIIIc) of calcium aluminate cement, single edge-cracked Brazilian disks under an anti-plane shear loading condition were proposed in this study. Three loading fixtures: 70o circular loading, 90o circular loading, and crack-edged loading, were arranged and compared in this study. A theoretical formula developed by Chen (2009) were adopted in this study. The disk specimens were prepared and made by calcium aluminate cement. The mode III fracture toughness test was applied by a simplistic load condition. These samples were calcined at 200℃, and 400℃, respectively, and were cooled to room temperature. Then a series of mechanical experiments were conducted on these samples. Correlations between various mechanical properties and mode III fracture toughness were discussed. Results show that experimental values of uniaxial compressive strength, indentation hardness index, modulus of rupture, and mode III fracture toughness decreases while temperature increases. It was observed that the relationships between mode III fracture toughness and modulus of rupture have the best linear correlation than others. The test proposed by Chen is a reliable method for measuring the mode III fracture toughness. The results also demonstrate that 70o circular loading condition achieves the most desirable experimental conditions.

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