SEAL FOR VISUAL CHECK OF APPLICATION OF PERMEABLE INORGANIC CONCRETE MODIFIER, AND METHOD FOR VISUAL CHECK OF PERMEABLE INORGANIC CONCRETE MODIFIER

摘要

[PROBLEMS] To provide a novel means for visually checking the application of a proper amount of a concrete modifier on the surface of a concrete structure readily, reliably, and objectively. [MEANS FOR SOLVING PROBLEMS] A seal (1) for visually checking the application of a concrete modifier comprises a reactive layer (2) containing an acid and an indicator on the front side, an adhesive layer (3) on the back side, and a blocking layer (4) between the reactive layer (2) and the adhesive layer (3). When the seal (1) is placed on the surface of a concrete structure (6) in a dotted state and a concrete modifier is sprayed onto the seal (1), the acid contained in the reactive layer (2) causes a neutralizing reaction with an alkali contained in the concrete modifier, and the indicator contained in the reactive layer (2) then causes a color-developing reaction. In this manner, it can be confirmed that a proper amount of a concrete modifier is applied. The blocking layer (4) can prevent an alkali component leached out from the concrete structure (6) from reaching the back side of the reactive layer (2) to discolor the reactive layer (2).