To provide a self-leveling hydraulic composition which has a high flowability, hardens quickly after the termination of application work while maintaining a pot life sufficient to easily perform application work, can obtain excellent horizontal level properties and very good surface workmanship, and can obtain excellent surface workmanship without accompanying material separation even when it has an especially high flowability.
The hydraulic composition contains a hydraulic component consisting of alumina cement, portland cement, and plaster, and a fluidizer, a thickener, and a moisturizer. The moisturizer is starch ether which is prepared from potato starch as the raw material and not subjected to gelatinization treatment.
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