ADMIXTURE FOR MORTAR AND CONCRETE, CEMENT COMPOSITION, MORTAR COMPOSITION AND CONCRETE COMPOSITION EACH INCLUDING THE ADMIXTURE, AND MANUFACTURING METHODS OF MORTAR CURED ARTICLE AND CONCRETE CURED ARTICLE

摘要

To provide an admixture capable of early providing sufficient demolding strength under a curing condition of a temperature generally applied in steam curing (for example about 50 to 70°C) even without applying specific cement, and sufficiently small in effect on change with time of flowability of a mortar composition and a concrete composition.SOLUTION: The admixture for mortar and concrete satisfies all conditions represented by inequality of the following (1) to (4), 10≤0.00083×A+0.24212×B+0.87668×C+1.4978×D+0.03276×A×B+5.65 (1). 3≤B16 (2). 0C2 (3). 0D2 (4), where content of high early strength Portland is A kg/20 kg, content of at least one gypsum of hemihydrate gypsum and anhydrous gypsum is B kg/20 kg, content of sodium silicate is C kg/20 kg, content of aluminum sulfate is D kg/20 kg.SELECTED DRAWING: Figure 4