Precast residual formwork panel manufacturing method for suppressing salt damage and frost damage of precast residual formwork panel, residual formwork construction method, and precast residual formwork panel

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a precast residual mold panel capable of suppressing salt damage and freezing damage of a precast residual mold panel, and a method for constructing a residual mold which can prevent the appearance from being impaired by a white flower phenomenon. SOLUTION: In a method of manufacturing a precast residual mold panel 1, a cement composition containing a predetermined compound is put into a molding mold, and a buried portion 7 of a metal fitting 3 is buried in the cement composition. A rear surface 2a of the panel body 2 including a step, a compaction step of compacting the cement composition charged into the molding frame, and a curing step of curing the cement composition, and excess water containing a predetermined compound and a calcium salt. Interspersed in the entire space, the capillary void 9A and the void 9B formed between the buried portion 7 and the panel body, the calcium salt in the cement composition reacts with a predetermined compound, and the back surface 2a of the panel body 2 is exposed to water. An insoluble calcium compound is formed, and the capillary gaps 9A and 9B are closed by the waterproof layer 4. [Selection diagram] Figure 1