Fiber reinforced cement composition and products and manufacturing process
AssigneeNichiha Corporation
InventorsKazuo Utagaki, Tadashi Sugita, Satoshi Takayama
Life of this patent
Estimating the term…
Abstract
A fiber reinforced cement composition having the following raw material composition is provided to manufacture a fiber reinforced cement product which is excellent in bending strength, dimension stability, handling property, flexibility performance, and processability such as nail performance, as well as to provide a process for manufacturing the product. Namely, the fiber reinforced cement composition comprises a hydraulic inorganic material, a siliceous material and a woody reinforcement in a mass ratio of CaO to SiO2 contained in the hydraulic inorganic material and the siliceous material in the raw materials in a range of from 23:77 to 60:40.
Claims23
A fiber reinforced cement composition comprising the following raw materials:
- a hydraulic inorganic material, a siliceous material and a woody reinforcement, wherein the mass ratio of CaO to SiO2 (CaO:SiO2) contained in the hydraulic inorganic material and the siliceous material in the raw materials is in a range of from 23:77 to 60:40.
A fiber reinforced cement composition having the following raw material composition:
- not less than 28% by mass and not more than 32% by mass of portland cement as a hydraulic inorganic material, not less than 54% by mass and not more than 58% by mass in total of fly ash and silica fume as a siliceous material, wherein the amount of the silica fume is not less than 3% by mass and not more than 7% by mass of the whole siliceous material consisting of the fly ash and the silica fume, not less than 8% by mass and not more than 12% by mass in total of NUKP and/or NBKP and used paper as a woody reinforcement, wherein the amount of the used paper is not less than 20% by mass and not more than 50% by mass of the whole woody reinforcement consisting of the NUKP and/or NBKP and the used paper, not less than 2% by mass and not more than 5% by mass of mica, and not less than 0.5% by mass and not more than 1.25% by mass of a water-soluble resin, wherein the mass ratio of CaO to SiO2 in the raw materials consisting of the hydraulic inorganic material and the siliceous material is in a range of from 30:70 to 40:60.
A fiber reinforced cement composition having the following raw material composition:
- not less than 28% by mass and not more than 32% by mass of portland cement as a hydraulic inorganic material, not less than 54% by mass and not more than 58% by mass in total of blast furnace slag and silica fume as a siliceous material, wherein the amount of the silica fume is not less than 5% by mass and not more than 20% by mass of the whole siliceous material consisting of the blast furnace slag and the silica fume, not less than 8% by mass and not more than 12% by mass in total of NUKP and/or NBKP and used paper as a woody reinforcement, wherein the amount of the used paper is not less than 20% by mass and not more than 50% by mass of the whole woody reinforcement consisting of the NUKP and/or NBKP and the used paper, not less than 2% by mass and not more than 5% by mass of mica, and not less than 0.5% by mass and not more than 1.25% by mass of a water-soluble resin, wherein the mass ratio of CaO to SiO2 in the raw materials consisting of the hydraulic inorganic material and the siliceous material is in a range of from 50:50 to 60:40.
A fiber reinforced cement composition having the following raw material composition:
- not less than 28% by mass and not more than 32% by mass of portland cement as a hydraulic inorganic material, not less than 54% by mass and not more than 58% by mass in total of fly ash and blast furnace slag as a siliceous material, wherein the amount of the fly ash is not less than 30% by mass and not more than 70% by mass of the whole siliceous material consisting of the fly ash and the blast furnace slag, not less than 8% by mass and not more than 12% by mass in total of NUKP and/or NBKP and used paper as a woody reinforcement, wherein the amount of the used paper is not less than 20% by mass and not more than 50% by mass of the whole woody reinforcement consisting of the NUKP and/or NBKP and the used paper, not less than 2% by mass and not more than 5% by mass of mica, and not less than 0.5% by mass and not more than 1.25% by mass of a water-soluble resin, wherein the mass ratio of CaO to SiO2 in the raw materials consisting of the hydraulic inorganic material and the siliceous material is in a range of from 40:60 to 60:40.
A fiber reinforced cement composition having the following raw material composition:
- not less than 28% by mass and not more than 32% by mass of portland cement as a hydraulic inorganic material, not less than 54% by mass and not more than 58% by mass in total of silica sand and silica fume as a siliceous material, not less than 8% by mass and not more than 12% by mass in total of NUKP and/or NBKP and used paper as a woody reinforcement, wherein the amount of the used paper is not less than 20% by mass and not more than 50% by mass of the whole woody reinforcement consisting of the NUKP and/or NBKP and the used paper, not less than 2% by mass and not more than 5% by mass of mica, and not less than 0.5% by mass and not more than 1.25% by mass of a water-soluble resin, wherein the mass ratio of CaO to SiO2 in the raw materials consisting of the hydraulic inorganic material and the siliceous material is in a range of from 23:77 to 35:65.
A process for manufacturing a fiber reinforced cement product comprising the steps of:
- dispersing in water a raw material composition comprising as main raw materials a hydraulic inorganic material, a siliceous material and a woody reinforcement mixed in a mass ratio of CaO to SiO2 contained in the hydraulic inorganic material and the siliceous material in the raw materials in a range of from 23:77 to 60:40 to give a slurry of the raw materials;
- forming a green mat from the slurry;
- and pressing the green mat by press molding and thereafter curing the mat in an autoclave at a temperature not lower than 150° C.
Dependencies are inferred from the claim text.