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Durability of the hydrated limestone-silica fume Portland cement mortars under sulphate attack
The effect of silica fume, emerging as a by-product in production of ferrosilicon, on corrosion resistance to sulphate attack of Na2SO4 and MgSO4 solutions has been studied in Portland cement mortars containing limestone and mortars containing no limestone. Expansion and changes in the elasticity modulus of mortars as a function of silica fume content have been investigated. The phases formed and the microstructural changes in the mortar exposed to sulphate corrosion have been determined by differential thermal analysis (DTA), X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The presence of monocarbonate and the absence of monosulphate were detected in the mortars containing limestone. The addition of silica fume results in less CH formed by the hydration process and consequently less gypsum and ettringite during the sulphate immersion of mortars. Mortars containing more than 5 mass% of SiO2, or simultaneously limestone and more than 2 mass% of SiO2, are characterised by a good sulphate resistance and show lower expansion than the control, the sulphate-resisting mortars independent of the type of the sulphate solution.
Durability of the hydrated limestone-silica fume Portland cement mortars under sulphate attack
The effect of silica fume, emerging as a by-product in production of ferrosilicon, on corrosion resistance to sulphate attack of Na2SO4 and MgSO4 solutions has been studied in Portland cement mortars containing limestone and mortars containing no limestone. Expansion and changes in the elasticity modulus of mortars as a function of silica fume content have been investigated. The phases formed and the microstructural changes in the mortar exposed to sulphate corrosion have been determined by differential thermal analysis (DTA), X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The presence of monocarbonate and the absence of monosulphate were detected in the mortars containing limestone. The addition of silica fume results in less CH formed by the hydration process and consequently less gypsum and ettringite during the sulphate immersion of mortars. Mortars containing more than 5 mass% of SiO2, or simultaneously limestone and more than 2 mass% of SiO2, are characterised by a good sulphate resistance and show lower expansion than the control, the sulphate-resisting mortars independent of the type of the sulphate solution.
Durability of the hydrated limestone-silica fume Portland cement mortars under sulphate attack
Zelic, J. (author) / Krstulovic, R. (author) / Tkalcec, E. (author) / Krolo, P. (author)
Cement and Concrete Research ; 29 ; 819-826
1999
8 Seiten, 20 Quellen
Article (Journal)
English
Durability of the hydrated limestone-silica fume Portland cement mortars under sulphate attack
| British Library Online Contents | 1999
| British Library Online Contents | 2000
| British Library Online Contents | 2000