Abstract
AbstractTo study the effect of the main oxides and the minor components in slags on their reactivity as SCM, various glasses were synthesized to stepwise imitate a commercial slag of average chemical composition. First, a glass was produced from the main oxides CaO, Al2O3 and SiO2. In a second step, the minor components MgO, Fe2O3, Na2O and K2O were added separately to the main oxide mix. A selection of two synthetic glasses was tested for their compressive strength contribution (up to 90 days) by substituting 20 wt.% of cement. After all testing times, the synthetic slags achieved a strength similar to that of the commercial product. The reactivities determined by heat flow calorimetry (R3 test) correlate with the calculation of NBO/T and the results of 29Si MAS NMR showing that a decreased degree of polymerization enhances the reactivity. Apart from that, FTIR spectroscopy and 27Al MAS NMR indicate a similar structure of the original and the synthetic slags.
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