Cement composition
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United States of America Patent
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-
Mar 14, 2000
Grant Date -
N/A
app pub date -
Jul 29, 1998
filing date -
Nov 29, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The cement composition of this invention includes 10 to 35% by weight of portland cement, 65 to 90% by weight of a synthetic pozzolan, and an activator for reducing the positive surface potential of the synthetic pozzolan. The synthetic pozzolan is obtained by an at least partial reduction from combustion residues having a SiO.sub.2 /CaO ratio of greater than 1:1 and containing Na.sub.2 O and K.sub.2 O as alkali oxides in an amount exceeding 1.5% by weight. The activator includes anionically active or anionic tensides.
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