Effect of carbonates on the formation of magnesium silicate hydrates

被引：29
作者：
Bernard, Ellina [1 ,2 ]
Lothenbach, Barbara [2 ,3 ]
Rentsch, Daniel [4 ]
German, Alexander [2 ]
Winnefeld, Frank [2 ]
机构：
[1] Imperial Coll London, Dept Civil & Environm Engn, 11 Skempton Bldg, London SW7 2AZ, England
[2] Empa, Swiss Fed Labs Mat Sci & Technol, Lab Concrete & Asphalt, CH-8600 Dubendorf, Switzerland
[3] Univ Bern, Inst Geol Sci, CH-3012 Bern, Switzerland
[4] Empa, Swiss Fed Labs Mat Sci & Technol, Lab Funct Polymers, CH-8600 Dubendorf, Switzerland
来源：
MATERIALS AND STRUCTURES | 2022年 / 55卷 / 07期
关键词：
Magnesium silicate hydrates (M-S-H); Mg-carbonates; Solid-state 13C CP-MAS NMR; Stability; M-S-H; THERMODYNAMIC PROPERTIES; CEMENTS; SYSTEM; PHASE; TEMPERATURE; DYPINGITE; MINERALS; CONCRETE; PACKAGE;
D O I：
10.1617/s11527-022-02018-3
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The effect of carbonates on the formation of magnesium silicate hydrate phases (M-S-H) was investigated in paste experiments. At molar ratio Mg/Si = 1.5, M-S-H pastes were synthesised from silica fume and MgO or MgO/hydromagnesite in a sodium carbonate-rich environment (dissolved 1.7 g of Na2CO3 for 100 g of binder). Thermogravimetric analysis, X-ray diffraction, and Si-29 MAS NMR data showed that M-S-H phases formed much faster in the presence of carbonates, which destabilised brucite. Na-23 MAS NMR data, cation exchange capacity measurements, thermogravimetric analysis coupled with infrared exhaust gas analysis, and C-13 MAS NMR data showed that traces of sodium and carbonates were sorbed on M-S-H. However, no evidence of the formation of Mg-carbonate phases was observed in crystalline or amorphous form. Thermodynamic modelling carried out with an updated database for Mg-phases indicated that M-S-H and hydromagnesite should be stable, in contrast to the observed partial destabilisation of hydromagnesite.
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页数：18
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