| abstract |
PROBLEM TO BE SOLVED: To provide a spraying material capable of strengthening an initial setting force to be sprayed on a ground surface exposed in a tunnel and capable of reducing a rebound amount and a dust amount and a spraying method using the same. thing. A cement mortar containing cement as a main component, a quick setting agent, and a spray material containing silica, and further comprising gypsum, ultrafine powder, a water reducing agent, a setting retarding agent, and a dust reducing agent. One type or two or more types selected from the group, a spray material formed by blending a fibrous substance, and a spray method using the spray material are used. [Selection figure] None |