CEMENT ADDITIVE AND CEMENT COMPOSITION

• Main Authors: TAKAYAMA TAKESHI, KAWAMURA MARIE, KAWAI MOE
• Format: Patent
• Language: English; Japanese
• Published: 19.07.2018
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; REFRACTORIES; SLAG; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE

PROBLEM TO BE SOLVED: To provide a cement additive that can be blended in a cement composition to sufficiently improve the fluidity of the cement composition even with the amount of use of water-reducing agent reduced, and provide a cement composition containing such a cement additive.SOLUTION: A cement additive contains a polycarboxylic acid copolymer that has a structural unit (I) derived from an unsaturated polyalkylene glycol ether monomer (a) represented by a specific general formula and a structural unit (II) derived from an unsaturated carboxylic acid monomer (b) represented by a specific general formula. Relative to all the structural units of the polycarboxylic acid copolymer, a content of the structural unit (I) is 34 mol%-44 mol%, and the polycarboxylic acid copolymer has a weight average molecular weight of 65000 or more.SELECTED DRAWING: None 【課題】セメント組成物中に含有させることによって、減水剤の使用量を減らしてもセメント組成物の流動性を十分に高めることができる、セメント用添加剤を提供する。また、そのようなセメント用添加剤を含むセメント組成物を提供する。【解決手段】本発明のセメント用添加剤は、特定の一般式で表される不飽和ポリアルキレングリコールエーテル系単量体（ａ）由来の構造単位（Ｉ）と特定の一般式で表される不飽和カルボン酸系単量体（ｂ）由来の構造単位（ＩＩ）とを有するポリカルボン酸系共重合体を含み、該ポリカルボン酸系共重合体を構成する全構造単位に対する該構造単位（Ｉ）の含有割合が３４モル％〜４４モル％であり、該ポリカルボン酸系共重合体の重量平均分子量が６５０００以上である。【選択図】なし