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題 名 | 各種水泥質的比熱與其成分之關係 |
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作 者 | 林維明; 林建中; 彭耀南; | 書刊名 | 材料科學 |
卷 期 | 27:4 1995.12[民84.12] |
頁 次 | 頁258-267 |
分類號 | 440.325 |
關鍵詞 | 比熱; 水泥質材料; 差示掃描量熱儀; 熱焓量; 熵值; 自由能; Specific heat; Cementitious material; Differential scanning calorimeter; Enthalpy; Entropy; Gibbs free energy; |
語 文 | 中文(Chinese) |
中文摘要 | 本文主要目的在探討攝氏180度下,水泥及水泥熟料之比熱值,利用差 示掃描量熱儀量測結果發現水泥熟料之熱焓值和比熱值大小順序為C�蚊>C�� AF>C�訕)β-C�特,已水化者,比熱值較大,且細度大者熱焓值較大,並有反應 速率之順位為C�毬F>C�蚊>C�訕>β-C�訕之現象出現;而高鋁水泥之比熱值較卜 特蘭I型水泥者為高。高鋁水泥之比熱值與其所含三氧化二鋁之數量成正比,本 研究實驗結果與過去文獻上所載矽酸三鈣(C�訕)之水化熱及水化速率均較鋁鐵 酸四鈣(C�毬F)大之數據相反(1-4)。由於水泥質之比熱與水化熱成正比之關係, 因此本文又從熱力學之溶解度乘積,熵值,自由能,CaO之平均鍵能及晶體結構 等各方面觀點探討水泥熟料的水化反應活性之大小順序,證實與其比熱值之大小 順序相符,本研究結果可應用於預鑄混凝土和月球混凝土之發展,為開啟高溫下 水泥化學之新研究領域。 |
英文摘要 | The object of this paper is to investigate the specific heat of cementitious materials athigh temperature. The measuring machine is differential scanning caiorimeter. It is found the order of enthalpy, and specific heat of clinker is C3A>CiAF>C3S>/?-CzS. Besides, the hydrated materials have higher specific heat values than that of unhydrated materials, the finer clinkers have more enthalpy developed, and their reaction rate order isC4AF>C3A>C3S>/?-C2S. The specific heat of high alumina cements are higher than that of Portland type I cement. The specific heat of high alumina cements liave relationship with their AlzC)3 contents. The test data shown are contrary to the references reports of the rate( 1 –4 of hydration, heat of hydration and enthalpy order of C3A>C3S>C<AF>/?-CzS . Sincespecific heat is directly relative to hydration heat, therefore, there are some discussion in this paper from the view points of the romechanic, ie. solubility product; the entropy; Gibbsfree energy; mean bond energy of CaO and microstructures stability of clinkers. The orderof the activation energy of hydration reaction and specific heat are clearly proved. The results of this research will benefit to the application of precasting concrete industry and also to the development of lunar concrete into a viable material to be used for concrete construction on the Moon. It may be a tool to open the new research area of cement chemistry in high temperatures. |
本系統中英文摘要資訊取自各篇刊載內容。