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Calcium silicate structure and carbonation shrinkage of a tobermorite-based material
AbstractCarbonated autoclaved aerated concretes (AACs) show no shrinkage at a degree of carbonation approximately less than 20%. The 29Si MAS NMR spectrum showed that at a degree of carbonation less than 25%, the typical double-chain silicate anion structure of tobermorite-11Å was well maintained and interlayer Ca ions were exchanged with protons. This corresponded to the absence of carbonation shrinkage at a degree of carbonation less than 20%. When the degree of carbonation increased from 25% to 50% up to 60%, the double-chain silicate anion structure of tobermorite-11Å was decomposed and Ca ions in the Ca–O layers were dissolved, showing a possible mechanism of carbonation shrinkage.
Calcium silicate structure and carbonation shrinkage of a tobermorite-based material
AbstractCarbonated autoclaved aerated concretes (AACs) show no shrinkage at a degree of carbonation approximately less than 20%. The 29Si MAS NMR spectrum showed that at a degree of carbonation less than 25%, the typical double-chain silicate anion structure of tobermorite-11Å was well maintained and interlayer Ca ions were exchanged with protons. This corresponded to the absence of carbonation shrinkage at a degree of carbonation less than 20%. When the degree of carbonation increased from 25% to 50% up to 60%, the double-chain silicate anion structure of tobermorite-11Å was decomposed and Ca ions in the Ca–O layers were dissolved, showing a possible mechanism of carbonation shrinkage.
Calcium silicate structure and carbonation shrinkage of a tobermorite-based material
Matsushita, Fumiaki (author) / Aono, Yoshimichi (author) / Shibata, Sumio (author)
Cement and Concrete Research ; 34 ; 1251-1257
2003-12-15
7 pages
Article (Journal)
Electronic Resource
English
Calcium silicate structure and carbonation shrinkage of a tobermorite-based material
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Calcium silicate structure and carbonation shrinkage of a tobermorite-based material
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