Carbon dioxide sequestration in foamed controlled low strength materials

Patent 7390444 Issued on June 24, 2008. Estimated Expiration Date:

February 24, 2025. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

109669

128980

591168

1449696

1966419

1966864

3867159

Cement composition
Patent #: 4069063
Issued on: 01/17/1978
Inventor: Ball

Method for the manufacture of concrete and like products
Patent #: 4093690
Issued on: 06/06/1978
Inventor: Murray

Method and apparatus for the manufacture of concrete and like products
Patent #: 4117060
Issued on: 09/26/1978
Inventor: Murray

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Inventors

Assignee

Wisconsin Electric Power Company

Application

No. 11064756 filed on 02/24/2005

US Classes:

264/37.14, Of gaseous process material (e.g., cooling gas, blowing gas, etc.)264/42, Of inorganic materials264/50By mechanically introducing gas into material

Examiners

Primary: McDowell, Suzanne E.

Attorney, Agent or Firm

Quarles & Brady LLp

Foreign Patent References

644828 CH 08/01/1984
4207235 DE 09/01/1993
2-18368 JP 01/01/1990
6-263562 JP 09/01/1994

International Class

B29B 17/00

Abstract

A process for sequestering carbon dioxide from the flue gas emitted from a combustion chamber is disclosed. In the process, a foam including a foaming agent and the flue gas is formed, and the foam is added to a mixture including a cementitious material (e.g., fly ash) and water to form a foamed mixture. Thereafter, the foamed mixture is allowed to set, preferably to a controlled low-strength material having a compressive strength of 1200 psi or less. The carbon dioxide in the flue gas and waste heat reacts with hydration products in the controlled low-strength material to increase strength. In this process, the carbon dioxide is sequestered. The CLSM can be crushed or pelletized to form a lightweight aggregate with properties similar to the naturally occurring mineral, pumice.

Other References

American Concrete Institute Committee 229, “Controlled Low-Strength Materials”, ACI 229R-99, pp. 229R-1 to 229R-15, Jun. 1999.
ASTM C 618, “Standard Specification for Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete”, 1999.