| abstract |
(57) [Summary] [PROBLEMS] To provide a spraying material and a spraying method capable of reducing a rebound rate of sprayed cement concrete or fiber. SOLUTION: A spray material obtained by mixing a quick-setting spray concrete containing fibers, quick-setting material, and ultrafine powder with a setting retarder. Further, a water reducing agent may be contained. A method for spraying quick-setting cement concrete, comprising mixing a quick-setting material into a spray-forming cement concrete containing fibers, and then mixing a setting retarder immediately before spraying. In this spraying method, the mixing distance is 100 To 600 mm, and the discharge distance is preferably 500 to 1500 mm. |