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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: Influence of Different Secondary Raw Materials on the Granulated Blast-Furnace Slag Reaction
Author(s): W. Brameshuber and P. Schriider
Publication: Special Publication
Appears on pages(s): 245-266
Keywords: activator; cement paste; composite cement; granulated
blast-furnace slag; hydration; strength development; supplementary
Abstract:For the practical use of granulated blast-furnace slag as a clinker substitute, the addition of an activator is neccessary, in order to ensure that a sufficient early and ultimate strength will be reached. Up to now, portland cement has been the most common type of activator for granulated blast-furnace slag. The addition of portland cement leads to the activation of the granulated blast-furnace slag either on an alkaline or, to a minor extent, on a sulphate basis. Materials which prevent the obstruction of the latent hydraulic reaction by a close gel layer of reaction products work as an activator. In this paper, the influence of different fine-grained additives, e. g. fly ash or cement kiln dust, on the granulated blast-furnace slag reaction and the strength development is discussed. The investigations showed that it is basically possible to manufacture composite cement with a high content of granulated blast-furnace slag by using industrially by-products. These cements shows particularly a higher early strength than the reference cement dependent on the composition respectively to the addition. The reactivity of the blast-furnace slag is strongly influenced by the chemical composition of the addition or activator but also by the mineralogical and chemical composition of the blast-furnace slag.
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