Molding of calcium silicate having high strength and its manufacturing method
AssigneeOnoda Cement Co., Ltd.
InventorsMasayuki Nakano, Ryozo Kuramoto, Shigeo Otozaki, Katsuaki Kaneko, Hideo Shibasaki, Noritoshi Tamura
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Abstract
A molding of calcium silicate having high strength, which is similar to a natural timber, wherein tobermorite, C--S--H (Calcium Silicate hydrate) and quartz are mixed, and glass fiber and pulp are added, respectively, and a Ti/Qi peak ratio of which is powder X-ray diffracted is 0.1 to 1.0, and an absolute bulk density of the molding is 0.3 to 0.7 g/cc.
Claims2
A molding of calcium silicate having high strength comprising calcium silicate hydrate, quartz, tobermorite and a reinforcing material made of glass fiber and pulp, wherein
- said molding contains 2-10 wt % of said glass fiber and 2-10 wt % of said pulp,
- a Ti/Qi ratio obtained by powder-X-ray diffraction is 0.1-1.0, wherein Ti represents the intensity of the X-ray diffraction of a (002) face of tobermorite crystal, and Qi represents the intensity of the X-ray diffraction of a (101) face of quartz crystal, and
- said molding has an absolute bulk density is 0.3-0.7 g/cc.
A method of manufacturing a molding of calcium silicate containing tobermorite and quartz and having high strength, from a calcareous material, a silicic material, and a fiber material, as raw materials, wherein the silicic material is formed of crystalline silica and amorphous silica mixed at a weight ratio of the amorphous silica to the total of the crystalline silica and the amorphous silica, of 0.2-0.8, the fiber material consists of alkali-proof glass fiber and pulp, the calcareous material and the silicic material are added such that the CaO/SiO.sub.2 molar ratio is 0.6-0.9, and the fiber material is added such that the amount of each of the alkali-proof glass fiber and the pulp is 2-10 wt %, comprising the steps of:
- (a) mixing all of the calcareous material, and part or all of the non-crystalline silica, of the raw materials, with water to form a slurry having a temperature of 50.degree. C.;
- (b) making said slurry into a gel by heating said slurry at a temperature of 80.degree. C. or higher at atmospheric pressure;
- (c) uniformly mixing said gel obtained in the above step (b) with the rest of said raw material;
- (d) molding a mixture obtained in the above step (c) by dehydration at a pressure of 3-30 kg/cm.sup.2 to form a molding;
- and
- (f) pressurizing and heating the molding obtained in the above step (d) in an autoclave under a saturation vapor pressure, at a temperature of 140.degree.-200.degree. C., for 2-18 hours until the Ti/Qi ratio measured by powder-X-ray-diffraction is 0.1-1.0, wherein Ti represents an intensity of the X-ray diffraction of a (002) face of tobermorite crystal, and Qi represents an intensity of the X-ray diffraction of a (101) face of quartz crystal, respectively.
Dependencies are inferred from the claim text.