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

Ines Garcia-Lodeiro, Ana Fernandez-Jimenez, Angel Palomo, Donald E. Macphee

Research output: Contribution to journalArticlepeer-review

218 Citations (Scopus)


This 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.

Original languageEnglish
Pages (from-to)1934-1940
Number of pages7
JournalJournal of the American Ceramic Society
Issue number7
Early online date12 Mar 2010
Publication statusPublished - Jul 2010


  • fly-ash
  • silicate hydrate
  • part 1
  • geopolymers
  • temperature
  • activation
  • cations
  • systems
  • FTIR


Dive into the research topics of 'Effect of Calcium Additions on N-A-S-H Cementitious Gels'. Together they form a unique fingerprint.

Cite this