Carbon removal through partial carbon burn-out from coal ash used in concrete
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United States of America Patent
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Aug 31, 2004
Grant Date -
Apr 15, 2004
app pub date -
Oct 15, 2002
filing date -
Oct 15, 2002
priority date (Note) -
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Abstract
Concrete's durability to freeze-thaw cycles is dependent on its level of air entrainment, the appropriate level of which is achieved with the aid of surface active or air entraining agents. These agents promote the fragmentation of large air voids into smaller ones and stabilize air voids in the concrete. The carbon matter found in fly ash when used as a pozzolanic component of concrete, adsorbs the air entraining agents, reduces the air voids and concrete's ability to withstand many freeze-thaw cycles. This invention teaches a process for a partial removal of the carbon from the coal ash, used in concrete, through a partial combustion of only a fine carbon fraction of the carbon residue of the coal ash responsible for adsorbing the air entraining agents, in a reactor with a controlled ignition system. The process of the invention thus limits the adsorption of the air entraining agents and improves the freeze-thaw properties of the concrete produced.

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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
LAFARGE CANADA INC | MONTREAL QUEBEC |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Oates, David Bridson | Kettleby, CA | 11 | 231 |
Zacarias, Philip Souza | Mississauga, CA | 3 | 113 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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