Alkali uptake in calcium alumina silicate hydrate (C-A-S-H)

被引：274

作者：

L'Hopital, E. ^{[1
]}

Lothenbach, B. ^{[1
]}

Scrivener, K. ^{[3
]}

Kulik, D. A. ^{[2
]}

机构：

[1] Empa, Lab Concrete & Construct Chem, CH-8600 Dubendorf, Switzerland

[2] Paul Scherrer Inst, Lab Waste Management, CH-5232 Villigen, Switzerland

[3] Ecole Polytech Fed Lausanne, Lab Construct Mat, CH-1015 Lausanne, Switzerland

来源：

CEMENT AND CONCRETE RESEARCH | 2016年 / 85卷

关键词：

C-S-H; C-A-S-H; Aluminium; Alkali; Characterization; G OILWELL CEMENT; PORTLAND-CEMENT; ALUMINOSILICATE-HYDRATE; ELEVATED-TEMPERATURES; CHEMICAL-STRUCTURE; PART II; NMR; PHASE; SI-29; STATE;

D O I：

10.1016/j.cemconres.2016.03.009

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Uptake of the alkalis K and Na by calcium silicate hydrate (C-S-H) and calcium alumina silicate hydrate (C-A-S-H) of molar Ca/Si ratios = 0.6 to 1.6 and molar Al/Si ratio = 0 or 0.05 has been studied at 20 degrees C. Alkalis are thought to be bound in the interlayer space of C-A-S-H and show preferred uptake by lower Ca/Si ratios and by higher alkali concentrations. A consequence of alkali uptake into C-A-S-H is a rearrangement of the C-A-S-H structure. Less calcium is present in the interlayer and shorter silica chains are observed for the same molar Ca/Si ratio. No significant difference was observed between sodium and potassium uptake. Equilibration times of 91 days to 1 year or the solid phase being either C-S-H or C-A-S-H had seemingly no effect on alkali uptake. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：122 / 136

页数：15

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