Coarse blast furnace slag as a cementitious material, comparative study as a partial replacement of Portland cement and as an alkali activated cement
✍ Scribed by J.I. Escalante-Garcia; L.J. Espinoza-Perez; A. Gorokhovsky; L.Y. Gomez-Zamorano
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 400 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0950-0618
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✦ Synopsis
The cementitious performance of a coarse granulated blast furnace slag, 2900 cm 2 /g, was investigated in concretes of 230, 280 and 330 kg binder/m 3 . First, the slag partially replaced 30%, 50% and 70% of Portland cement, the strength reduced as the amount of slag increased; however, for high binder contents, similar strengths were attained for lower Portland cement contents. Second, the slag was alkali activated with sodium silicate (moduli 1.7 and 2) at 4%, 6% and 8% %Na 2 O, the strength increased with the amount of slag in the concrete and developed faster as %Na 2 O increased. The microstructures of both type of concretes were dense; however, the strengths of activated slag were superior at similar binder loads, indicating that the hydration products of activated slag are of higher intrinsic strength.