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Antagonistic effect of superplasticizer and colloidal nano-silica in the hydration of Alite and Belite pastes

Joakim Björnström ; Itai Panas (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
JOURNAL OF MATERIALS SCIENCE (0022-2461). Vol. 42 (2007), 11, p. 3901-3907.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: TRICALCIUM SILICATE; CEMENT; DENSITY; MOLECULES; CHEMISTRY



Denna post skapades 2007-10-22.
CPL Pubid: 55852

 

Institutioner (Chalmers)

Institutionen för kemi (2001-2011)
Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)

Ämnesområden

Spektroskopi
Fasta tillståndets kemi
Kvantkemi

Chalmers infrastruktur