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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Resistance of Sulfate Attack of Mixtures with Limestone-Portland Blended Cements
Author(s): M. Collepardi, S. Monosi, O. Favoni, and
J. J. Ogoumah Olagot
Publication: Special Publication
Appears on pages(s): 941-950
Keywords: blended cements; ettringite; limestone-portland cement; sulfate attack; thaumasite
Abstract:Blended hinders based on limestone-Portland cements are very popular in Eu- rope after the advent of the EN 197-1 European norm. However, according to some British researchers concretes with limestone-Portland blended cements would he more vulnerable to sulfate attack than the corresponding concretes with Portland cement when exposed to sulfate environment. In order to assess this hypothesis, the performances of cement mixtures with portland cement and limestone-portland blended cements containing two different percent-ages of ground limestone (15% and 30%) were studied. Sound and cracked specimens of cement pastes, all at a given water/binder ratio of 0.40, were exposed to a sulfate-rich aqueous solution (10% by Na2SO4) at 20°C and 5 C. There was no evidence of ettringite or thaumasite formation related to the sulfate attack in the sound specimens independently of the temperature and cement type. On the other hand, in the cracked speci- mens some ettringite and/or thaumasite was found into the cracks of the specimens kept at 5 C, particularly when they were prepared with blended cement at 30% of ground limestone. This appears to he merely related to a higher water-cement ratio at a given water-binder ratio.
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