Process for producing blended cements with reduced carbon dioxide emissions
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United States of America Patent
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Aug 30, 2005
Grant Date -
May 13, 2004
app pub date -
Apr 30, 2003
filing date -
Nov 7, 2002
priority date (Note) -
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Abstract
A process for producing blended cement in which the cement contains Portland Cement mixed thoroughly with a microfiller, and possibly a water reducing agent, to provide a dry cement mixture, and fine supplementary cementitious materials selected from the materials blast furnace slag, fly ash, quartz, silica, amorphous silicon dioxide, limestone, and recycled concrete. The supplementary materials are first subjected to a grinding step in a dry state to a specific surface of at least 1000 cm2/g (Blaine). In a second step the ground supplementary materials are subjected to a grinding step together with at least 20% by weight of the total grinding mass of a highly reactive cement mixture in a dry state, to achieve a specific surface of at least 3000 cm2/g (Blaine).
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