A hard sell? Metakaolin in high-performance concrete

By IM Staff
Published: Saturday, 27 May 2017

Adding metakaolin to cement can improve the strength, corrosion resistance and appearance of concrete, but as Frank Hart* explains, the construction industry is yet to be fully won over by its performance benefits.

Metakaolin is an amorphous, alumino-silicate mineral, manufactured by calcining kaolin at temperatures between 650°C and 850°C. It is classed as a pozzolan, defined by international standards agency ASTM as a siliceous or aluminous and siliceous material, which reacts chemically with calcium hydroxide (lime) at ordinary temperatures, to form compounds possessing...

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