Process for manufacturing hydraulic binders
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United States of America Patent
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Apr 12, 1988
Grant Date -
N/A
app pub date -
Jun 14, 1985
filing date -
Jun 25, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention has for its object: a fabrication process of hydraulic binders, characterized in that it consists: I. in preparing an active product according to a method comprising the following steps: selection of a raw material containing intimately mixed clay phases and calcium carbonate; heat treatment of said material at a temperature between 700 and 900 degrees C.; application during the heat treatment of a partial pressure of carbonic gas opposing the thermal dissociation of the calcium carbonate beyond that which combines with the clay phase; achievement of a simultaneous activation of the clay phases by dehydroxylation (pozzolanic activation) and of the clay-lime combinations with potential hydraulic properties, without formation of free lime; II. in mixing up to 95% of the active product so obtained with the corresponding complement to 100% of an activating product generating calcium hydroxyde.
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