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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Activation of Blast Furnace Slag by Some Inorganic Materials
Author(s): J. Metso and E. Kajaus
Publication: Special Publication
Appears on pages(s): 1059-1074
Keywords: accelerating agents;
ce slag; compressive
lets; portland cement
a e-strength relation*
strength; fly ash; gra
Abstract:The activation of merwinite-gehlenite type blast furnace slag was studied using ordinary Portland cement clinker, Ca(OH) CaS04 . 2 H20, NaOH, Na2Si03, Na2C03, fly ash, phosphogypsum, f I admixture, etc. The blast furnace slag used in this investigation was either granulated slag or pelletized slag. The spe ific sur- 5 face area of the granulated slag was 270 m2/kg or 400 m /kg and was 500 m2/kg when used with F-admixture. Sodium hydroxides, phospho-gypsum + NaOH, Na2C03 + NaOH and fly ash + NaOH were good activa-tors. Pelletized slag was activated well with strong bases. The pelletized slag needed higher concentration of NaOH than granulated slag. Fresh granulated and pelletized slag with a specific surface of about 300 m2/kg or higher could be self-activated and gave a compressive strength of 20 MPa at 28 days. The aged,ground granulated and pelletized blast furnace slag, however, did not harden without an activator. With both slags, at a slag content of 300 kgjm3, high compressive strength was obtained with F-admixture. The compressive strength at early ages was comparable to that of normal concrete, when the binding agent was ordinary Portland cement.
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