Thermochemical data and phase equilibria of halide (Cl-, Br-, I-) containing AFm and hydrotalcite compounds

被引:2
|
作者
Collin, Marie [1 ,2 ,9 ]
Prentice, Dale P. [1 ,2 ]
Geddes, Dan [3 ]
Provis, John L. [4 ]
Ellison, Kirk [5 ]
Balonis, Magdalena [6 ]
Simonetti, Dante [2 ,7 ]
Sant, Gaurav N. [1 ,2 ,6 ,8 ,9 ]
机构
[1] Univ Calif Los Angeles, Dept Civil & Environm Engn, Lab Chem Construction Mat LC2, Los Angeles, CA USA
[2] Univ Calif Los Angeles, Inst Carbon Management, Los Angeles, CA USA
[3] Univ Sheffield, Dept Mat Sci & Engn, Immobilisat Sci Lab, Sheffield, England
[4] PSI, Paul Scherrer Inst, Villigen, Switzerland
[5] Elect Power Res Inst, Charlotte, NC USA
[6] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA USA
[7] Univ Calif Los Angeles, Dept Chem & Biomol Engn, Los Angeles, CA USA
[8] Univ Calif Los Angeles, Calif NanoSyst Inst CNSI, Los Angeles, CA USA
[9] Univ Calif Los Angeles, Dept Civil & Environm Engn, Lab Chem Construct Mat LC2, Los Angeles, CA 90095 USA
关键词
AFm; equilibrium constant; hydrotalcite; LDH; thermodynamic modeling; LAYERED DOUBLE HYDROXIDES; MOLAL THERMODYNAMIC PROPERTIES; FRIEDELS SALT; THERMOGRAVIMETRIC ANALYSIS; EXCHANGE PROPERTIES; IONIC-RADII; HYDRATION; TEMPERATURE; STANDARD; CHLORIDE;
D O I
10.1111/jace.19665
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Layered double hydroxide (LDH) phases that form during cement hydration can incorporate a variety of interlayer anions in their interlayer positions. Here, a range of phases of general formula [(M(1-x)M(x)III)-M-II(OH)(2)][A(n-)](x/n)<middle dot>zH(2)O were synthesized, where M-II = Mg2+ (hydrotalcite) or Ca2+ (AFm), M-III = Al3+ such that [M-II/Al] = 2 (Ca and Mg, atomic units) or 3 (Mg only), and A = Cl-, Br-, or I-. All the synthesized phases were characterized to assess their composition, density, and crystal structure. By approach from undersaturation, the solubility data of these compounds was measured at 5, 25, and 60 degrees C. This thermochemical data was used to successfully model their formation using thermodynamic modeling and to infer the fields of stability of these compounds for conditions of relevance to cementitious systems. It is seen that halide-containing hydrotalcite phases strongly compete with hydroxide-containing hydrotalcite, with the latter prevailing at high pH. In contrast, halide-containing AFm compounds are more stable compared with hydroxide-containing AFm compositions.
引用
收藏
页码:3562 / 3576
页数:15
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