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    • 3. 发明专利
    • CEMENT COMPOSITION
    • JPH11147750A
    • 1999-06-02
    • JP30871197
    • 1997-11-11
    • MITSUBISHI MATERIALS CORP
    • ASAKURA ETSUROONISHI KAZUHIKOCHIBA HIROHIDE
    • C04B28/04C04B103/32
    • PROBLEM TO BE SOLVED: To obtain a cement composition with high separation resistance, fluidity and mechanical strength by including each specific amount of Portland cement, silica fume and limestone fine powder. SOLUTION: The cement composition is obtained by incorporating 0.01-0.4 pt.wt. of acrylic or cellulose-based water-soluble polymeric powder as thickening agent in 100 pts.wt. of a mixture prepared by mixed grinding of 36-80 pts.wt. of Portland cement, 1-5 pts.wt. of powdery or granular silica fume and 15-60 pts.wt. of limestone fine powder 2,500-12,000 cm /g in specific surface area. Specifically, the production process for this composition is as follows: (I) a finishing mill is charged with powdery or granular silica fume which is then dispersed simultaneously with grinding cement clinker and the like, followed by conducting a grinding finish by the mill and then adding limestone fine powder, and (II) Portland cement subjected to grind finish using the finish mill is incorporated with powdery or granular silica fume and limestone fine powder by the use of a mixer.
    • 7. 发明专利
    • PREPARATION OF CONCRETE
    • JPH0788834A
    • 1995-04-04
    • JP23621793
    • 1993-09-22
    • MITSUBISHI MATERIALS CORP
    • CHIBA HIROHIDE
    • B28C7/12C04B24/38C04B28/02
    • PURPOSE:To exhibit effectively the effect of incorporation of a thickener, to decrease the cost of the thickener and to solve such problem as air entraining properties and workability when a powder is added by a method wherein the thickener is incorporated as a water soln. with a stable solubility when a concrete is prepd. by kneading a cement powder, an aggregate, water and the thickener. CONSTITUTION:A thickener is dissolved in advance in an alkaline water soln. and it is incorporated. It is possible thereby to dissolve almost all kinds of thickeners if they are alkaline water soln., to make temp. dependence of the solubility a little and to make a stable water soln. even at temp. It is possible thereby to incorporate the thickener with good workability and without the problem of entrained air as a stable liq. withput being influenced by temp. and to produce an excellent effect in such a way that the effect of incorporation of the thickener can be exhibited by a little amt. of incorporation. It is also possible thereby to manufacture easily a concrete with an enough strength when a mold is released and no need for making it dense.