Thermal evolution of hydrates in carbonation-cured Portland cement

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The present study investigates the thermal evolution of hydrates in carbonation-cured Portland cement. Paste samples were placed in a carbonation chamber after the 24 h of initial curing, while reference samples were cured in a sealed condition until 28 days. Thermogravimetry, unconfined strength tests, X-ray diffractometry, and solid-state 29 Si and Al-27 MAS NMR spectroscopy were conducted. The results showed that the binder gel in carbonation-cured cement shares some structural similarities with aluminosilicate glass in terms of Si and Al analogues. This characteristic was also reflected by its thermo-gravimetric behavior, presenting much less weight loss associated with dehydration in comparison with hydrated cement. However, the binder gel in carbonation-cured cement underwent depolymerization into monomeric Si at 800 degrees C, similar to hydrated cement. Moreover, carbonation-cured cement underwent crystallization pathway identical to that of hydrated cement, displaying a hydrate-like thermal behavior.
Publisher
SPRINGER
Issue Date
2018-02
Language
English
Article Type
Article
Keywords

GEOLOGIC SEQUESTRATION CONDITIONS; BETA-DICALCIUM SILICATE; MAS NMR-SPECTROSCOPY; C-S-H; ACCELERATED CARBONATION; WELL CEMENT; CO2; MICROSTRUCTURE; PRODUCTS; CONCRETE

Citation

MATERIALS AND STRUCTURES, v.51, no.1, pp.7 - 7

ISSN
1359-5997
DOI
10.1617/s11527-017-1114-7
URI
http://hdl.handle.net/10203/240976
Appears in Collection
CE-Journal Papers(저널논문)
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