2 research outputs found
FTIR study of the solâgel synthesis of cementitious gels: CâSâH and NâAâSâH
The study explored the compatibility between the main product of Portland cement hydration and the main product of the alkali activation of fly ash: CâSâH and NâAâSâH gels, respectively. Both gels were synthesized with laboratory reagents at different pH values. Blends of the two were synthesized as well, using the solâgel procedure. All the gels were characterized with Fourier transform IR spectroscopy (FTIR). The gels synthesized with this procedure were shown to precipitate together with a silica-rich gel. In addition, the pH level was found to play a determinant role in both CâSâH and NâAâSâH gel synthesis. The CâSâH gel is the major phase formed at pH > 11 and NâAâSâH gel for pH > 12. The results relating to the joint synthesis of the two (CâSâH and NâAâSâH) gels were not conclusive. Technique used for the characterization failed to differentiate between them in the blended material.This study was funded by the Directorate
General of Scientific Research under project MAT2006//705 and also
benefited from an I3P contract (ref. I3P-PC2004L) co-financed by the
CSIC and the European Social Fund.Peer reviewe