| abstract |
(57) [Summary] [Problem] A spray material and a spray material that can be sprayed onto a ground surface exposed in a tunnel, can strengthen initial coagulation force, and can further reduce the amount of rebound and dust. To provide a spraying method. SOLUTION: A cement mortar containing cement as a main component, a quick setting agent, and a spray material containing a colloidal solution of silica or alumina or an aqueous solution of an alkali silicate, and further, gypsum, ultrafine powder, and water reduction One or two or more selected from the group consisting of an agent, a setting retarder, and a dust reducing agent, a spray material obtained by blending a fibrous substance, and a spray method using the spray material. |