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Effect of Calcium Additions on N–A–S–H Cementitious Gels

AuthorsGarcía-Lodeiro, Inés; Fernández-Jiménez, Ana; Palomo, Ángel; Macphee, Donald E.
Keywordsaluminosilicate hydrate gels
Issue DateJun-2010
PublisherJohn Wiley & Sons
CitationJournal of the american ceramic society 93(7): 1934–1940(2010)
AbstractThis paper reports a research on the properties of synthetic sodium aluminosilicate hydrate gels as models for the gels arising in alkali-activated aluminosilicate systems. The interaction between these N–A–S–H gels and aqueous calcium was studied to explore a potential consequence of mixing conventional Portland cements and alkali-activated systems. The properties of two N–A–S–H gels (with Si/Al=1 and 2) synthesized in highly alkaline media, in the presence of calcium are reported. N–A–S–H gels were synthesized using aluminum nitrate, sodium hydroxide, and a sodium silicate. FTIR, NMR, and TEM/EDX techniques were used to characterize N–A–S–H gels before and after adding calcium. The results obtained show that calcium is uptaken in N–A–S–H gels resulting in a modification of the chemical composition due to the substitution of sodium per calcium.
Publisher version (URL)http://dx.doi.org/10.1111/j.1551-2916.2010.03668.x
Appears in Collections:(IETCC) Artículos
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