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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: High Reactivity Metakaolin (HRM) for High Performance Concrete
Author(s): M. A. Caldarone and K. A. Gruber
Publication: Special Publication
Appears on pages(s): 815-828
Keywords: chlorides; compressive strength; permeability; pozzolans; silica fume; Materials Research
Abstract:Hgh Reactivity Metakaolin (HRM) is produced by controlled thermal activation of purified kaolinite, an aluminosilicate mineral, to a reactive, amorphous state. HRM, being pozzolanic, reacts with free lime (Ca(OH) 2), a byproduct of portland cement hydration. In this investigation, two high- performance concrete mixtures containing HRM were studied. In the first mixture proportion, HRM was formulated as an addition to the cement. In the second mixture, HRM was used as a cement replacement. The compressive strength and rapid chloride permeability of the HRM concretes was compared to nonpozzolanic concrete controls and concretes that contained equal amounts of silica fume. The results of this study show that the strength and impermeability of HRM concrete is significantly higher than nonpozzolanic concrete. The HRM concrete showed properties equivalent to similar silica fume (SF) concretes, while using significantly less superplasticizer to reach an equivalent consistency.
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