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Use of recycled copper slag for blended cements
Authors
Aitcin
Al-Jabri
+29 more
Baragaño
Diamond
Diamond
Douglas
Douglas
European Standard EN 196-1:1996
European Standard EN 196-5:1994
European Standard EN 196-9:2005
European Standard EN 197-1:2000
Frías
Frías
Gorai
Goñi
Grutzeck
Halse
Hwang
Lachowski
LEA
Payá
Pratt
Regourd
Sánchez de Rojas
Sánchez de Rojas
Sánchez de Rojas
Sánchez de Rojas
Sánchez de Rojas
Tenoutasse
Tixier
Zain
Publication date
1 January 2008
Publisher
'Wiley'
Doi
Cite
Abstract
Copper slag is a by-product generated during smelting to extract copper metal from the ore. The copper slag obtained may exhibit pozzolanic activity and may therefore be used in the manufacture of addition-containing cements. In this paper the effect of the incorporation of the copper slag in cement is measured. Blends of copper slag with Portland cement generally possess properties equivalent to Portland cement containing fly ash, but very different to the silica fume incorporation. Copper slag and fly ash reduce the heat of hydration more effectively than silica fume in mortars. The replacement of 30% cement by copper slag reduces the flexural and compressive strength in a similar way to fly ash; however, after 28 days, the reduction is less than the percentage of substitution. Hydrated calcium aluminate phases were analysed using scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The pozzolanic activity of copper slag is similar to that of fly ash and higher than silica fume. In the presence of low water/cement ratios, certain pozzolanic materials produce a very compact cement paste that limits the space available for hydration products, a determining factor in the formation of hydrated calcium aluminates. SEM was found to be a useful analytical technique when aluminates are formed and can be clearly detected by XRD. Copyright © 2008 Society of Chemical IndustryPeer reviewe
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