The effect of pozzolans and slag on the expansion of mortars cured at elevated temperature
| Autor: | T. Ramlochan, M.D.A. Thomas, R.D. Hooton |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Cement
Ettringite Materials science Silica fume Metallurgy technology industry and agriculture Slag Building and Construction Pozzolan law.invention Portland cement chemistry.chemical_compound chemistry law visual_art Fly ash visual_art.visual_art_medium General Materials Science Composite material Metakaolin |
| Zdroj: | Cement and Concrete Research. 34:1341-1356 |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2003.12.026 |
| Popis: | The microstructural and microchemical development of heat-cured Portland cement mortars containing silica fume, metakaolin, blast-furnace slag, and fly ash were analysed using pore solution analysis, X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy-dispersive X-ray analysis (EDX). Incorporation of these materials into the mixture modifies the composition of the C-S-H gel, the quantities of the hydration products, and the microstructure. Ettringite was formed during moist storage in all specimens, but was not accompanied by expansion where a sufficient amount of metakaolin, blast-furnace slag, or a suitable fly ash replaced a proportion of the Portland cement; replacement with silica fume was not as effective at eliminating expansion. The different behaviour of silica fume from the other supplementary cementing materials is believed to reflect a difference in the way ettringite is formed in the presence of Al2O3-bearing mineral admixtures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect