期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 151, 期 -, 页码 178-185出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.06.088
关键词
Geopolymer; MgO; Carbonation; Microstructure; Gel
资金
- Energy Technology Development Program - Ministry of Trade Industrial and Energy of the Korean government [2013T100100021]
- Saudi Aramco - KAIST CO2 Management Center
The present study investigated the microstructural and compositional formations of the gel phase in MgO-incorporated geopolymer exposed to a high CO2 concentration. Samples were synthesized by the alkali-activation of fly ash with different dosages of MgO. The results showed that a higher level of MgO incorporation into a geopolymer exposed to a CO2-rich environment decreases the porosity, corresponding to an increase in the compressive strength. Furthermore, the microstructural densification of geopolymer caused by the formation of Mg-bearing hydrate was observed, and this may have important implications for use in high-CO2 conditions by reducing the diffusivity of CO2 through the pore structure. (C) 2017 Published by Elsevier Ltd.
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