Cementitious composite that includes delignified cellulosic material and process of making it
OwnerRobert C. Thomas, Craig O. Thomasinventors
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Abstract
A cementitious composite of delignified cellulosic debris and Portland cement is produced from waste sludge from a paper recycling process and combining the resultant material in particle sizes ranging from 0.06 to 25 mm with Portland cement.
Claims22
A method for making a cementitious composite comprising the steps of:
- providing wastewater sludge from a paper recycling process, the sludge having a waste and solids content that consists essentially of nonfibrous delignified cellulose debris, the cellulose debris being of particles that substantially are less than 5 mm long and having an aspect ratio of less than 100-to-1;
- b) mixing the sludge with Portland cement;
- c) molding the mixture into a desired shape;
- and
- d) curing the mixture.
A method for producing a cementitious composite comprising the steps of:
- a) providing waste water sludge from a paper recycling process, the sludge having water and a solid content that includes delignified cellulosic, the cellulose consisting essentially of nonfibrous particles that are between about 0.06 to about 2.5 mm long and that have an aspect ratio less than 100-to-1;
- b) dewatering the sludge so that the sludge contains no more than 75 percent water;
- c) watering Portland cement;
- d) mixing the dewatered sludge and the watered Portland cement;
- e) dewatering the mixture of sludge and Portland cement;
- f) forming the dewatered mixture into desired shapes;
- and
- g) curing the dewatered mixture to form the cementitious composites.
A cementitious composite comprising a desired shape of a cured mixture of cellulose, clay and hydrated Portland cement, the cellulose consisting essentially of nonfibrous cellulose debris and the cellulose and clay consisting essentially of particles less than 25 mm in length and having an aspect ratio less than 100-to-1
- wherein the cement intimately contacts the surface of the cellulose debris forming a bond.
Dependencies are inferred from the claim text.