CALCITE FINE POWDER AND HYDRAULIC MATERIAL

• Main Authors: NISHIDA TOYOICHI, ASAKURA ETSURO, MATSUDA TOSHITAKA, TSUKADA TAKUMI
• Format: Patent
• Language: English
• Published: 11.04.2000
• Edition: 7
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF NATURAL STONE

PROBLEM TO BE SOLVED: To increase the hydration reactivity and the acidic gas absorption by mixing specific amounts of calcite powder and an inorganic powder having a specific average particle size and grinding them. SOLUTION: The objective calcite fine powder comprises 100 pts.wt. of powdery calcite and 1-10 pts.wt. of an inorganic powder having an average particle size of m<=1 μm. As the inorganic powder, silica fume is particularly suitable. The calcite powder as a raw material preferably has an average particle size of 10-5,000 μm from the view points of their grinding and activation effect. On the grinding, an auxiliary grinding agent and a variety of functional additive may be admixed, particularly the addition of a grinding aid such as diethylene glycol, triethanolamine or the like increases more the activation effect in an amount of 0.05-5 pts.wt. per 100 pts.wt. of the calcite powder. The resultant calcite fine powder is added in an amount of 5-150 pts.wt. per 100 pts.wt. of the cement to give an excellent hydraulic material.