High Reactivity Metakaolin. Refined form of an ASTM C618, Class N (natural) pozzolan. A high performance, mineral admixture, similar in performance to silica fume, additionally comparable in cost. Pure white powdered in form will, not effect the natural color or darken concrete as silica fume does. Suitable for high-performance color matching in architectural concrete. Dosage at 5% to 10%, of cement by weight. No bleed water, better finishability, more creamy, cleanup is easier with slightly higher 28 day strengths and 25% - 35% less plasticizer is required than silica fume.
Process:Produced by heating a purified kaolinite clay to a specific high temperature to alter the physical composition (calcined). Through a carefully controlled refining process, impurities are removed producing an almost 100% reactive, pure white, pozzolanic powder, very evenly distributed in particle size and results in a mineral admixture which is consistent in appearance and performance from lot to lot.
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