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A fiber cement composite material providing improved rot resistance and durability, the composite material incorporating biocide treated fibrous pulps to resist microorganism attacks. The biocide treated fibers have biocides attached to inner and outer surfaces of individualized fibers to protect th

A fiber cement composite material providing improved rot resistance and durability, the composite material incorporating biocide treated fibrous pulps to resist microorganism attacks. The biocide treated fibers have biocides attached to inner and outer surfaces of individualized fibers to protect the fibers from fungi, bacteria, mold and algae attacks. The biocides selected have strong affinity to cellulose and do not interfere with cement hydration reactions. This invention also discloses the formulation, the method of manufacturing and the final fiber cement products using the biocide treated fibers.

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1. A composite building material, comprising:a cementitious matrix;individualized cellulose fibers incorporated into the cementitious matrix, wherein the cellulose fibers are at least partially treated with a biocide chemical that inhibits microorganism growth inside the fibers; anduntreated cellulo

1. A composite building material, comprising:a cementitious matrix;individualized cellulose fibers incorporated into the cementitious matrix, wherein the cellulose fibers are at least partially treated with a biocide chemical that inhibits microorganism growth inside the fibers; anduntreated cellulose fibers. 2. The composite building material of claim 1, wherein the biocide chemical is attached to inner and outer surfaces of the individualized fibers. 3. The composite building material of claim 1, wherein the chemical is selected from the group consisting of fungicides, algaecides, mold and termite preservatives, and mixtures thereof. 4. The composite building material of claim 1, wherein the chemical comprises inorganic compounds. 5. The composite building material of claim 4, wherein the inorganic compounds are selected from the group consisting of sodium, potassium, calcium, zinc, copper, and barium salts of carbonate, acetate, stearate, silicate, sulfate, halide, and borate; zinc carboxylates; boric acids; sodium dichromate; copper oxene; copper chrome arsenate (CCA); chromated copper borate (CBC); ammoniacal copper arsenate (ACA); ammoniacal copper zinc arsenate (ACZA); copper chromium fluoride (CFK); copper chromium fluoroborate (CCFB); and copper chromium phosphorous (CCP), and combinations thereof. 6. The composite building material of claim 1, wherein the chemical comprises organic compounds. 7. The composite building material of claim 6, wherein the organic compounds are selected from the group consisting of propiconazole, tebuconazole, organochloride, quaternary ammonium compounds (AAC), tri-n-butyltin oxide (TBTO), tri-n-butyltin naphthenate (TBTN), didecyldimethylammonium bromide (DDAB), didecyldimethylammonium chloride (DDAC), and mixtures thereof. 8. The composite building material of claim 1, wherein the chemical comprises about 0.01% to 20% of the dry weight of the treated cellulose fibers. 9. The composite building material of claim 1, wherein the cellulose fibers are made from cellulose pulps of a lignocellulosic material by a pulping process. 10. The composite building material of claim 9, wherein the fiber lengths are between about 0.2 and 7 mm. 11. The composite building material of claim 10, wherein the fiber lengths are between about 0.6 and 4 mm. 12. The composite building material of claim 1, wherein the treated fibers comprise about 0.5%-20% by weight of the matrix. 13. The composite building material of claim 1, wherein the cementitious matrix and the individualized cellulose fibers are autoclaved. 14. The composite building material of claim 13, further comprising an aggregate. 15. The composite building material of claim 14, wherein the aggregate is ground silica. 16. The composite building material of claim 1, comprising about 10-80% cement by weight. 17. A composite building material, comprising:a cementitious matrix;individualized cellulose fibers incorporated into the cementitious matrix, wherein the cellulose fibers are at least partially treated with a biocide chemical and inhibits microorganism growth inside the fibers; andnatural inorganic and synthetic fibers. 18. A material formulation used to form a composite building material, comprising:a cementitious binder; andcellulose fibers, wherein the cellulose fibers have been individualized and wherein at least some of the cellulose fibers are treated with a chemical to inhibit microorganism growth in the fibers, wherein the chemical comprises barium borate. 19. The formulation of claim 18, comprising about 10%-80% cement by weight. 20. The formulation of claim 18, wherein the cementitious binder has a surface area of about 250 to 400 m 2 /kg. 21. The formulation of claim 18, wherein the cementitious binder comprises Portland cement. 22. The formulation of claim 18, wherein the cementitious binder is selected from the group consisting of high alumina cement, lime, ground granulated blast furnace slag cement, and high phosphate cement. 23. The formulation of claim 18, further comprising an aggregate. 24. The formulation of claim 23, wherein the aggregate is approximately 30%-70% of the formulation by weight. 25. The formulation of claim 23, wherein the aggregate comprises silica having a surface area of about 300-450 m 2 /kg. 26. The formulation of claim 23, wherein the aggregate comprises ground silica. 27. The formulation of claim 23, wherein the aggregate is selected from the group consisting of amorphous silica, micro silica, geothermal silica, diatomaceous earth, coal combustion fly and bottom ashes, rice hull ash, blast furnace slag, granulated slag, steel slag, mineral oxides, mineral hydroxides, clays, magnasite or dolomite, metal oxides and hydroxides, polymeric beads, and mixtures thereof. 28. The formulation of claim 18, wherein the treated cellulose fibers comprise about 0.5%-20% of the formulation by weight. 29. The formulation of claim 18, further comprising a density modifier. 30. The formulation of claim 29, wherein the density modifier is about 0%-50% of the formulation. 31. The formulation of claim 29, wherein the density modifier comprises natural or synthetic lightweight materials selected from the group consisting of plastic material, expanded polystyrene, other foamed polymer materials, glass and ceramic material, calcium silicate hydrates, microspheres, volcano ashes including perlite, pumice, shirasu basalt, and zeolites in expanded forms, and mixtures thereof. 32. The formulation of claim 18, further comprising additives. 33. The formulation of claim 32 wherein the additives are about 0%-10% of the formulation. 34. The formulation of claim 32, wherein the additives are selected from the group consisting of viscosity modifiers, fire retardants, waterproofing agents, silica fume, geothermal silica, pigments, colorants, plasticisers, dispersants, forming agents, flocculent, drainage aids, wet and dry strength aids, silicone materials, aluminum powder, clay, kaolin, bentonite, alumina trihydrate, zeolite, mica, metakaolin, calcium carbonate, wollastonite, polymeric resin emulsion, and mixtures thereof. 35. At The formulation of claim 18, wherein the treated cellulose fibers decrease the average fiber loss in the composite building material by more than about 5% as compared to a building material made from an equivalent formulation without treated cellulose fibers after 9 months of exposure in a high humidity and rot prone environment. 36. The formulation of claim 18, wherein the treated cellulose fibers improve the rot resistance of the composite building material as compared to a building material made from an equivalent formulation without treated cellulose fibers. 37. The formulation of claim 0. 19 °, Wherein the treated cellulose fibers improve the retention of modulus of rupture (MOR) of the composite building material after 18 months of exposure in high humidity and rot-prone environment by more than about 5% as compared to a building material made from an equivalent formulation without treated cellulose fibers. 38. The formulation of claim 18, wherein the treated cellulose fibers improve the retention of modulus of elasticity (MOE) of the composite building material by more than about 5% after 18 months of exposure in high humidity and rot-prone environment as compared to a building material made from an equivalent formulation without treated cellulose fibers. 39. The formulation of claim 18, wherein the treated cellulose fibers improve the retention of ultimate strain of the composite building material by more than about 5% after 18 months of exposure in high humidity and rot-prone environment as compared to a building material made from an equivalent formulation without treated cellulose fibers. 40. The formulation of claim 18, wherein the treated cellulose fibers improve the retention of toughness of the building product by more than about 5% after 18 months of exposure in high humidity and rot-prone environment as compared t o a building material made from an equivalent formulation without treated cellulose fibers. 41. A material formulation used to form a composite building material, comprising:a cementitious binder; andcellulose fibers, wherein the cellulose fibers have been individualized and wherein at least some of the cellulose fibers are treated with a chemical to inhibit microorganism growth in the fibers, wherein the chemical comprises copper oxene. 42. A material formulation used to form a composite building material, comprising:a cementitious binder; andcellulose fibers, wherein the cellulose fibers have been individualized and wherein at least some of the cellulose fibers are treated with a chemical to inhibit microorganism growth in the fibers, wherein the treated cellulose fibers are blended with untreated cellulose fibers. 43. A method of manufacturing a fiber reinforced composite building material, comprising:providing individualized cellulose fibers;treating at least a portion of the cellulose fibers with a chemical, wherein the chemical inhibits microorganism growth in the treated cellulose fibers;mixing the treated fibers with untreated cellulose fibers;mixing the treated fibers and the untreated 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; andcuring the fiber cement article so as to form the fiber reinforced composite building material. 44. The method of claim 43, wherein providing individualized fibers comprises removing a majority of the lignin binding the cellulose fibers together. 45. The method of claim 43, wherein providing individualized fibers comprises mechanically separating the fibers. 46. The method of claim 43, wherein cellulose fibers are individualized by a chemical pulping method. 47. The method of claim 43, wherein treating the fibers comprises physically and/or chemically bonding the biocide chemical to the outer and inner surface of the cellulose fibers. 48. The method of claim 43, wherein treating the fibers comprises using a pressure impregnation technique. 49. The method of claim 43, wherein treating the fibers comprises using a concentration diffusion technique. 50. The method of claim 43, further comprising processing the treated fibers by dispersing the fibers at a pre-selected consistency range and then fibrillating the treated fibers to a pre-selected freeness range. 51. The method of claim 43, wherein treating the fibers comprises chemically bonding a biocide to inner and outer surfaces of the cellulose fibers. 52. The method of claim 43, wherein processing the treated fibers comprises dispersing the treated fibers at the consistency of about 1%-6% in a hydra-pulper. 53. The method of claim 43, further comprising processing the treated fibers by fibrillating the treated fibers to the freeness of 150 to 750 degrees of Canadian Standard Freeness. 54. The method of claim 53, wherein processing the treated fibers comprises fibrillating the treated fibers to the freeness of 150 to 650 degrees of Canadian Standard Freeness. 55. The method of claim 43, wherein mixing the treated fibers with ingredients comprises mixing the treated fibers with an aggregate. 56. The method of claim 43, wherein mixing the treated fibers with ingredients comprises mixing the treated fibers with additives. 57. The method of claim 43, wherein mixing the treated fibers with ingredients comprises mixing the treated fibers with a density modifier. 58. The method of claim 43, wherein mixing comprises directly adding biocides to the mixture. 59. The method of claim 43, wherein forming the fiber cement article comprises forming the article using a process selected from the group consisting of a Hatschek sheet process, a Mazza pipe process, a Magnani process, injection molding, extrusion, hand lay-up, molding, casting, filter pressing, Fourdrinier forming, multi-wire forming, gap blade forming, gap roll/blade form ing, Bel-Roll forming, and combinations thereof. 60. The method of claim 43, wherein curing the fiber cement article comprises pre-curing and curing. 61. The method of claim 60, wherein the fiber cement article is pre-cured for up to 80 hours at ambient temperature. 62. The method of claim 60, wherein the fiber cement article is pre-cured for up to 24 hours at ambient temperature. 63. The method of claim 60, wherein the fiber cement article is cured in an autoclave. 64. The method of claim 63, wherein the fiber cement article is autoclaved at an elevated temperature and pressure at about 60 to 200° C. for about 3 to 30 hours. 65. The method of claim 63, wherein the fiber cement article is autoclaved at an elevated temperature and pressure at about 60 to 200° C. for about 24 hours or less. 66. The method of claim wherein curing the fiber cement article comprises air curing the formed article for up to 30 days. 67. A The method of claim 17, further A method of manufacturing a fiber reinforced composite building material, comprising:providing individualized cellulose fibers;treating at least a portion of the cellulose fibers with a chemical, wherein the chemical inhibits microorganism growth in the treated cellulose fibers;mixing the treated fibers with synthetic fibers;mixing the treated fibers and synthetic 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; andcuring the fiber cement article so as to form the fiber reinforced composite building material.