Chemical acceleration of a neutral granulated blast-furnace slag activated by sodium carbonate
| Autor: | Maxim Kovtun, Julia Shekhovtsova, Elsabe P. Kearsley |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Silica fume Carbonation Tobermorite Building and Construction law.invention Portland cement chemistry.chemical_compound chemistry Chemical engineering Ground granulated blast-furnace slag law Sodium hydroxide General Materials Science Composite material Calcium oxide Sodium carbonate |
| Zdroj: | Cement and Concrete Research. 72:1-9 |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2015.02.014 |
| Popis: | This paper presents results of a study on chemical acceleration of a neutral granulated blast-furnace slag activated using sodium carbonate. As strength development of alkali-activated slag cements containing neutral GBFS and sodium carbonate as activator at room temperature is known to be slow, three accelerators were investigated: sodium hydroxide, ordinary Portland cement and a combination of silica fume and slaked lime. In all cements, the main hydration product is C–(A)–S–H, but its structure varies between tobermorite and riversideite depending on the accelerator used. Calcite and gaylussite are present in all systems and they were formed due to either cation exchange reaction between the slag and the activator, or carbonation. With accelerators, compressive strength up to 15 MPa can be achieved within 24 h in comparison to 2.5 MPa after 48 h for a mix without an accelerator. |
| Databáze: | OpenAIRE |
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