| 摘要 |
PURPOSE: To provide a high strength type wet spray concrete extremely high in strength as compared to a conventional wet spray concrete. CONSTITUTION: In the wet spray concrete using an accelerating agent consisting essentially of calcium aluminate and a ready-mixed concrete, a binder prepared by previously adding 1.0-5.0mass% anhydrous gypsum in internal ratio to a binding main material consisting essentially of a high-early-strength Portland cement is used as the ready-mixed concrete, the quantity of the binder is controlled to >=400kg/m<3> and the ratio of water to the binder is controlled to <=50mass%. By using the ready-mixed concrete, the high strength type wet spray concrete >=500kgf/cm<2> in compressive strength in the case that a molding formed by wet spraying is aged at 20 deg.C and at the age of 28 days is obtained. |
