Alkali binding by magnesium silicate hydrates

被引：29
作者：
Bernard, Ellina [1 ,2 ]
Lothenbach, Barbara [1 ]
Pochard, Isabelle [3 ]
Cau-Dit-Coumes, Celine [4 ]
机构：
[1] Empa, Swiss Fed Labs Mat Sci & Technol, Lab Concrete & Construct Chem, CH-8600 Dubendorf, Switzerland
[2] Univ Bern, Rock Water Interact Grp, Inst Geol Sci, Bern, Switzerland
[3] Univ Bourgogne Franche Comte, CNRS, UMR 6213, UTINAM, Besancon, France
[4] CEA, SEAD, DE2D, DEN, Bagnols Sur Ceze, France
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2019年 / 102卷 / 10期
基金：
瑞士国家科学基金会;
关键词：
alkalis; cement; magnesium silicate hydrate (M-S-H); sorption; C-S-H; SULFATE ATTACK; CEMENTITIOUS MATERIALS; REACTIVE MAGNESIA; THERMAL-REACTIONS; CALCIUM; CEMENTS; SI-29; PRODUCTS; PHASE;
D O I：
10.1111/jace.16494
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：
The binding of Na+, K+, and Li+ by magnesium silicate hydrate (M-S-H) was investigated in batch sorption experiments. Sorption isotherms and cation exchange measurements indicated the binding of alkalis in cation exchange sites compensating the negative surface charge of M-S-H. Higher pH values led to further deprotonation of the silanol groups and a higher alkali uptake by M-S-H. No significant incorporation of alkalis in the main silica or magnesium oxide sheets was observed. However, the silica sheets were less polymerized in the presence of higher alkali hydroxide concentrations.
引用
收藏
页码：6322 / 6336
页数：15
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