Sika Technology Ag

Toho Chemical Industry Co., Ltd.

Satoshi Kobayashi

Akira Ikeda

Akira Suga

Michael Wernher Danzinger

Kaname Saitoh

Susumu Hashizume

Ikuhide Togami

To provide a chemical agent whereby adjustment of air volume is easier, particularly in a hydraulic composition having fly ash blended therein. An admixture for a hydraulic composition, having a structure indicated by general formula (1) and including a carbon blocker including either one type of compound selected from a group comprising phosphate esters or at least two mixtures; and a water-reducing agent. (In the formula, Rindicates a hydrogen atom, an alkyl group, an alkenyl group, or a (meth)acryloyl group, AO indicates a C2-3 oxyalkylene group, n indicates an average added molar number for the oxyalkylene group AO of 2-150, m indicates an integer between 1 and 3, M indicates a hydrogen atom, an alkali metal atom, a group II metal atom, an ammonium group, or an organic ammonium group.)

Admixture for hydraulic composition

A cement dispersant that includes a copolymer resulting from a reaction of components (A) to (C), where: (A) is an ester compound obtained by adding 0 to 10 moles of Calkylene oxide to 1 mole of at least one compound of Formula (1) RO-(AO)n-H (where R is a Calkyl group, A is a Calkylene group, and n is an integer of 0 to 7) and subjecting the resulting adduct to a reaction with an &#x3b1;,&#x3b2;-unsaturated carboxylic acid, in which the compound of Formula (1) contains not more than 5% by mass of the constituent compounds having n of 3 or less relative to the total mass of the compound of Formula (1); (B) is an &#x3b1;,&#x3b2;-unsaturated carboxylic acid or a salt thereof; and (C) is another copolymerizable monomer, where appropriate, or a salt thereof.

Copolymer and cement dispersant including the copolymer

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Sodegaura, Japan

Satoshi Kobayashi