Proposal for the classification of
alkali-activated binders and Geopolymer binders
A. Herrmann, A. König, F. Dehn, MFPA Leipzig GmbH, Leipzig, Germany
Research into alternative binders and cement substitutes with distinctively reactive properties is being pursued not only from a technical but increasingly also from an economic and sustainable point of view. Concrete additives which have been known for many years such as fly ash, silica fume and blastfurnace slag, though also other processed secondary raw materials and residues are playing an increasingly important role for concrete construction along with the idea of life cycles. Alkali-activated binders and Geopolymer binders have been repeatedly named in this connection over the past years. Generalised technological and design-relevant principles have to be provided in order to be able to use these so-called alternative binders to produce concrete. Since the properties of concrete that can be achieved with alkali-activated binders largely depend on the raw materials that are used, it would initially appear sensible to suggest a general definition of terms to classify these alternative binders as opposed to conventional cementitious binders. The following article therefore presents a classification of alkali-activated binders as well as Geopolymer binders and at the same time a differentiation to conventional binders taking into account the strength-forming texture and hydraulicity.
Summary CEMENT INTERNATIONAL 03/2015 pp 62-69
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