Fiber cement composite materials using bleached cellulose fibers
AssigneeJames Hardie Technology Limited
InventorsCaidian Luo, Donald J. Merkley
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Abstract
A fiber cement composite material that incorporates a blend of bleached and unbleached cellulose fibers as a partial or complete substitute for premium grade cellulose pulp is provided. Bleached standard grade cellulose fibers are used in conjunction with unbleached, standard grade cellulose fibers to provide a fiber cement composite product having substantially equal or even superior flexibility and strength as an equivalent fiber cement composite material reinforced by premium grade, unbleached cellulose fibers. A synergistic combination of bleached and unbleached standard grade cellulose fibers to produce a composite material with the desired properties previously achievable only through the use of premium grade cellulose pulp.
Claims27
A composite material, comprising:
- a cementitious matrix;
- and
- cellulose fibers incorporated into the cementitious matrix, wherein the cellulose fibers comprise a blend of bleached and unbleached cellulose fibers.
A method of manufacturing a fiber reinforced cement composite material, comprising:
- providing bleached cellulose fibers and unbleached cellulose fibers;
- mixing the bleached and unbleached cellulose fibers with a cementitious binder to form a fiber cement mixture;
- forming the fiber cement mixture into a fiber cement article of a pre-selected shape and size;
- and
- curing the fiber cement article.
A composite building material, comprising:
- a cementitious matrix;
- and
- a blend of cellulose fibers comprising bleached and unbleached cellulose fibers, wherein the blend of cellulose fibers is selected to provide the building material with pre-determined flexibility and strength.
A composite material, comprising:
- a cementitious matrix;
- a first portion of cellulose fibers having a Kappa number of less than or equal to about 10;
- and
- a second portion of standard grade cellulose fibers having a Kappa number of greater than about 10.
Dependencies are inferred from the claim text.