本文關(guān)鍵詞： 鈣礬石 氫氧化鋁相 自由能 焓 定量分析　出處：《硅酸鹽學(xué)報(bào)》2017年05期 　論文類型：期刊論文

【摘要】：硫鋁酸鈣(C_4A_3$)是硫鋁酸鹽水泥熟料中最重要的組成部分。既有研究表明,調(diào)整C_4A_3$、二水石膏(C$H_2)和氫氧化鈣(CH)的比例可以改變水化產(chǎn)物中鈣礬石(AFt)和氫氧化鋁(AH_3)相的比例,但缺乏從熱力學(xué)計(jì)算和實(shí)驗(yàn)方面的驗(yàn)證。使用Gibbs自由能變和焓變對水化反應(yīng)進(jìn)行計(jì)算,結(jié)果表明:水化反應(yīng)在熱力學(xué)上可自發(fā)進(jìn)行;將實(shí)驗(yàn)室燒成的C_4A_3$復(fù)配一定比例的C$H_2、CH,在水灰比為10的情況下水化28 d,使用X射線衍射和熱重分析對水化產(chǎn)物進(jìn)行定量分析,結(jié)果表明水化產(chǎn)物中只有AFt和AH_3。雖然實(shí)驗(yàn)值與理論計(jì)算值不能完全吻合,但隨著C$H_2、CH摻量的增加,水化產(chǎn)物中AFt的含量逐漸增多,AH_3相的含量逐漸減少。
[Abstract]:C4A / C) is the most important part of sulphoaluminate cement clinker. Existing studies have shown that adjusting the ratio of C4A3, gypsum dihydrate, and calcium hydroxide can change the ratio of ettringite and AH3) in hydration products. Gibbs free energy and enthalpy change were used to calculate the hydration reaction. The results showed that the hydration reaction could occur spontaneously in thermodynamics. A certain proportion of Che / H _ 2H _ 2H _ (Ch) was added to C4A / C / C / C / C / C / C / C _ (10) for 28 days, and the hydration products were quantitatively analyzed by X-ray diffraction and thermogravimetric analysis (TGA) when the ratio of water to cement was 10. The results show that there are only AFt and AH3 in hydration products. Although the experimental values do not agree with the theoretical values, the content of AFt in hydration products gradually increases with the increase of CnH2CH content, and the content of AHST3 phase decreases gradually.
【作者單位】： 大連理工大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金(51472041)資助項(xiàng)目
【分類號】：TQ172.1

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本文編號：1550222