METHOD FOR TEMPORARILY HOLDING DECORATIVE PIECE AGAINST FORM MEMBER FOR MOLDING DECORATIVE FACE OF CIVIL ENGINEERING AND ARCHITECTURAL STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a method for temporarily holding decorative pieces such as tiles against a form by use of an adhesive suited for temporarily holding the decorative pieces against a foam styrol form. SOLUTION: An adhesive is obtained when an A-agent comprising 15 to 25 parts of polyvinyl alcohol mixed with 1 to 5 parts of dextrin, 1 to 5 parts of propylene glycol, 70 to 80 parts of water, and an appropriate amount of dispersion assistant is blended with 3 to 10 wt.% B-agent comprising polyisocyanate. The polyvinyl alcohol used is obtained by mixing 5 to 20 parts of a high polymer having a polymerization degree of 1000 to 2000 and 1 to 20 parts of a low polymer having a polymerization degree of 200 to 700. The adhesive 3 is interposed between each decorative-piece-fitting recess part 2 formed in the surface of a form member 1 for molding the decorative face of a civil engineering or architectural structure such as a concrete structure and a decorative piece 4 fitted in each recess part 2, to temporarily hold the decorative pieces against the surface of the form member for molding the decorative face.