A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Alkali uptake in calcium alumina silicate hydrate (C-A-S-H)
Abstract 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°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 91days to 1year or the solid phase being either C-S-H or C-A-S-H had seemingly no effect on alkali uptake.
Alkali uptake in calcium alumina silicate hydrate (C-A-S-H)
Abstract 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°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 91days to 1year or the solid phase being either C-S-H or C-A-S-H had seemingly no effect on alkali uptake.
Alkali uptake in calcium alumina silicate hydrate (C-A-S-H)
L'Hôpital, E. (author) / Lothenbach, B. (author) / Scrivener, K. (author) / Kulik, D.A. (author)
Cement and Concrete Research ; 85 ; 122-136
2016-03-04
15 pages
Article (Journal)
Electronic Resource
English
C-S-H , C-A-S-H , Aluminium , Alkali , Characterization
Alkali uptake in calcium alumina silicate hydrate (C-A-S-H)
| British Library Online Contents | 2016
Alkali uptake in calcium alumina silicate hydrate (C-A-S-H)
| British Library Online Contents | 2016
Alkali uptake in calcium alumina silicate hydrate (C-A-S-H)
| Online Contents | 2016
Al uptake in calcium silicate hydrate and the effect of alkali hydroxide
| Elsevier | 2022
Effect of alkali hydroxide on calcium silicate hydrate (C-S-H)
| Elsevier | 2021