第45卷第5期2017年5月
硅酸盐学报Vol. 45，No. 5
May，2017 JOURNAL OF THE CHINESE CERAMIC SOCIETY
b.cbptki DOI：10.14062/j.issn.0454-5648.2017.05.09 硫铝酸钙-二水石膏-氢氧化钙-水水化系统的热力学计算 张洋洋，常钧，赵九野
(大连理工大学土木工程学院，辽宁大连 116024)电梯井口门
缓冲纸垫摘要：硫铝酸钙(C4A3$)是硫铝酸盐水泥熟料中最重要的组成部分。既有研究表明，调整C4A3$、二水石膏(C$H2)和氢氧化钙(CH)的比例可以改变水化产物中钙矾石(AFt)和氢氧化铝(AH3)相的比例，但缺乏从热力学计算和实验方面的验证。使用Gibbs自由能变和焓变对水化反应进行计算，结果表明：水化反应在热力学上可自发进行；将实验室烧成的C4A3$复配一定比例的C$H2、CH，在水灰比为10的情况下水化28 d，使用X射线衍射和热重分析对水化产物进行定量分析，结果表明水化产物中只有AFt和AH3。虽然实验值与理论计算值不能完全吻合，但随着C$H2、CH掺量的增加，水化产物中AFt的含量逐渐增多，AH3相的含量逐渐减少。 关键词：钙矾石；氢氧化铝相；自由能；焓；定量分析
中图分类号：TQ172 文献标志码：A 文章编号：0454–5648(2017)05–0657–05
泰尹网wiy5网络出版时间：2017–04–21 12:30:04 网络出版地址：knski/kcms/detail/11.2310.TQ.20170421.1230.009.html
Thermodynamic Calculation of Calcium Sulfoaluminate-Gypsum-Calcium
Hydroxide-H2O System
薄鳅>固体氧ZHANG Yangyang, CHANG Jun, ZHAO Jiuye
(School of Civil Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China)
Abstract: Calcium sulfoaluminate (C4A3$) is a dominant mineral in calcium sulfoaluminate cement. The previous studies indicated that the radio of C4A3$、gypsum (C$H2) and calcium hydroxide (CH) could determine the ettringite (AFt) to AH3 ratios in the final product. However, little work on the corresponding thermodynamic calculation and experimental validation has been reported. In this paper, the changes of the Gibbs free energy and enthalpy were used for the thermodynamic calculati
on of hydration reaction. The reaction can occur spontaneously in the thermodynamics. The synthesized C4A3$ is incorporated with the specific quantities of C$H2 and CH, hydrated for 28 d with distilled water at a water-cement ratio of 10. According to the quantitative phase analysis by X-ray diffraction and thermogravimetry, there exist only AFt and AH3 phases in the hydration products. Although the AFt and AH3 contents are not consistent with the theoretical values, the AFt content increases and AH3 content reduces with the increase of the C$H2 and CH contents.
Keywords: ettringite; aluminum hydroxide; free energy; enthalpy; quantitative analysis
硫铝酸盐水泥作为硅酸盐水泥、铝酸盐水泥以外的第三系列水泥，具有能耗小、CO2排放低、良好的胶凝性、耐腐蚀和膨胀性能可调的特点[1–2]。硫铝酸盐水泥熟料主要由硫铝酸钙(C4A3$：C=CaO；A=Al2O3；$=SO3)、硅酸二钙、铁相及其他相组成，其中C4A3$为其最重要的组成部分，水泥的性能与C4A3$直接相关[3]。C4A3$单矿物的水化及其复掺石膏(C$H2，H=H2O)和石灰(CH)后的水化已被广泛研究。其中复掺C$H2和CH的水化机理比较复杂，有一定规律性，在实际工程中用途广泛，具有重要研究意义。反应式(1)和(2)是C4A3$复掺不同摩尔比C$H2和CH时的水化反应，其水化产物以钙矾石(AFt)和铝凝胶(AH3)为主[4–5]。
C4A3$+8C$H2+6CH+74H → 3C6A$3H32 (1)
收稿日期：2016–07–01。修订日期：2017–02–18。基金项目：国家自然科学基金(51472041)资助项目。
第一作者：张洋洋(1991—)，男，博士研究生。
通信作者：常钧(1970—)，男，博士，教授。Received date:2016–07–01. Revised date: 2017–02–18.
First author: ZHANG Yangyang (1991–), male, Doctoral candidate. Correspondent author: CHANG Jun (1970–), male, Ph.D., Professor. E-mail: mlchang@dlut.edu陶瓷运输
