SPRAYING MATERIAL AND SPRAYING ENGINEERING

摘要

PROBLEM TO BE SOLVED: To obtain a spraying material capable of reducing rebound ratio of spraying cement concrete and fiber. SOLUTION: This spraying material is obtained by mixing a quick setting spraying cement containing a fiber and a quick setting material with a setting retarder solution. This engineering of quick setting cement concrete comprises mixing a spraying cement concrete containing a fiber with a quick setting material and mixing the mixture with a setting retarder solution immediately before spraying. In the spraying engineering, it is preferable that a distance X from mixing the spraying cement concrete C with the quick setting cement T to mixing of the setting retarder solution R is set to 100-600 mm and a distance Y from mixing the setting retarder solution with the quick setting spraying cement concrete to a quick setting spraying cement concrete discharge port is set to 500-1,500 mm.