| abstract |
(57) 【Abstract】 PROBLEM TO BE SOLVED: To improve the strength development in the early, middle and long term without clogging the nozzle or deteriorating the performance of the quick-setting agent, and to reduce the rebound rate. I will provide a. SOLUTION: A cement containing fluorocalcium aluminate and a cement mortar containing gypsum as a main component are blended with a quick-setting agent containing calcium aluminate as a main component immediately before spraying, and more preferably in the cement mortar, At least one selected from the group consisting of a water reducing agent, a setting retarder, a setting accelerator, and an ultrafine powder is blended, and an alkaline aluminate salt and / or an alkaline carbonate is blended in the quick-setting agent. Immediately before spraying, the cement containing fluorocalcium aluminate and the cement mortar containing gypsum as the main components are combined with a quick-setting agent containing the calcium aluminate as the main component and sprayed. |