Antagonistic effect of superplasticizer and colloidal nano-silica in the hydration of Alite and Belite pastes
Artikel i vetenskaplig tidskrift, 2007

The dependence on the hydration rate for Alite and Belite clinker phases in the presence of a polycarboxylate superplasticizer PC SP upon addition of colloidal nano-silica CNS were monitored by means of Diffuse Reflectance Infrared spectroscopy DR-FTIR. Spectral signatures of clinker dissolution and product formation were acquired for both materials. The rates for the build-up of product vibrational band intensities were found to depend sensitively on addition of CNS. The hydration product was proposed to be calcium-silicate-hydrate C-S-H. Details in the spectral signatures were found to differ. Quantum chemical calculations were employed and found to be consistent with the interpretation that small clusters dominate the Alite C-S-H spectrum, whereas the Belite C-S-H spectrum results from extended polymers.

DENSITY

TRICALCIUM SILICATE

MOLECULES

CEMENT

CHEMISTRY

Författare

Joakim Björnström

Göteborgs universitet

Itai Panas

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Journal of Materials Science

0022-2461 (ISSN) 1573-4803 (eISSN)

Vol. 42 3901-3907

Ämneskategorier

Oorganisk kemi

Analytisk kemi

Teoretisk kemi

DOI

10.1007/s10853-006-0467-z