This paper presents a
characterization analysis of alkali-activated steel slag. The effect ratio of
steel slag and ferronickel slag which are the precursor materials on the
compressive strength of the alkali-activated materials was investigated. The
combination of sodium hydroxide solution of 15 moles concentration and sodium
silicate was used as an alkaline activator. The ratio between steel slag and
alkaline liquid was fixed at 3.31 for all mixtures. Ambient curing (20℃ - 25℃) are used throughout the experiment.
Compressive strength shows the alkali-activated steel slag presented high
strength at 14 days curing which is 21.56 MPa. In comparison, the alkali
activated steel slag had better strength than 50/50 Fe/SS alkali-activated slag
which only achieved 16.75 MPa. Result obtained shows that alkali-activated
steel slag had better water absorption than 50/50 Fe/SS alkali-activated slag
at 7 days curing. Furthermore, the activation of steel slag was contributed to the
presences of gehlenite, larnite, akermanite and magnetite. Lastly,
the alkali-activated steel slag presents the vibration of the Si-O bonds at
wave number 970.46 cm﹣1 contributed by the calcium silicate hydrate.
Cite this paper
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