Performance of concrete exposed to natural carbonation: Use of the k-value concept
| Autor: | Tiago Santos, A. C. Bettencourt Ribeiro, Arlindo Gonçalves |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Cement
Materials science Carbonation Metallurgy 0211 other engineering and technologies Slag 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Clinker (cement) law.invention Portland cement Ground granulated blast-furnace slag law Fly ash visual_art 021105 building & construction visual_art.visual_art_medium General Materials Science 0210 nano-technology Civil and Structural Engineering |
| Zdroj: | Construction and Building Materials. 175:360-370 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2018.04.206 |
| Popis: | This work presents results of concrete carbonation after 10 years of exposure to a natural environment not sheltered from rain, and the values are utilized for the application of the k-value concept used within EN 206 for Type II additions to concrete. The concrete mixtures were prepared with Portland cement and different replacement levels of cement by fly ash (FA), ground granulated blast furnace slag (GGBFS), or both FA and GGBFS and using distinct water/binder ratios. The concrete performance is related with the binder constituents and dosages through the k-value concept. Thirty-three concrete mixtures were tested and the results show a consistent decrease of carbonation resistance when the water/clinker ratio increases, which is in accordance with the low k-values obtained for fly ash and slag. The analysis performed also shows that the mixtures with FA present lower carbonation resistance than those with GGBFS, for the same cement replacement level. |
| Databáze: | OpenAIRE |
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