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The Initial Setting Time of Ground Granulated Blastfurnace Slag GGBS and Its Relation to the Modulus of the Alkali-Activating Solution

Helén Jansson (Institutionen för bygg- och miljöteknik, Byggnadsteknologi) ; Diana Bernin ; Kerstin Ramser ; Luping Tang (Institutionen för bygg- och miljöteknik, Byggnadsteknologi)
2nd International conference on Advances in chemically-activated materials (CAM'2014), RILEM Proceedings (1461-1147). Vol. 92 (2014), p. 309-318.
[Konferensbidrag, refereegranskat]

There are indications on that the initial setting time is dependent on the relative ratio of Na2O to SiO2 when sodium silicate solutions (Na2SiO3) are used for the alkali-activation of ground granulated blast-furnace slag (GGBS). One possible reason for this is that the ratio (called modulus) not only influences the pH but also the viscosity of the solution. The viscosity is, in turn dependent on the structures in the liquid. Therefore, we have investigated the structure of sodium silicate solutions of different moduli by infrared spectroscopy (IR) and silicon nuclear magnetic resonance (Si-29-NMR). The results, which show that the silica configuration is highly dependent on the modulus, will be discussed in relation to the initial setting time of corresponding measurements on GGBS hydration

Nyckelord: water glass solutions; structure; infrared spectroscopy (IR); Si-29-NMR;SI-29 NMR-SPECTROSCOPY; BASE-LINE; GEOPOLYMERS; ELIMINATION; SPECTRA

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Denna post skapades 2015-09-18. Senast ändrad 2017-03-21.
CPL Pubid: 222765


Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Byggnadsteknologi (2005-2017)
Svenskt NMR-centrum vid Göteborgs universitet (GU)


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