▎ 摘　　要

NOVELTY - An adhesive tape (10) comprises a base material (11), an adhesive layer (12), and a functional layer (13) in order. The adhesive layer contains an adhesive. The functional layer contains heat-expandable particles and a tacky resin. The expansion coefficient when the heat-expandable particles are heated to 60 degrees C or more is 2-150 times with respect to the volume of the heat-expandable particles at 23 degrees C. The adhesive force on the adhesive layer side to a cement-based structure having surface roughness Ra of 100 mu m or less as 180 degrees peel force measured according to JIS Z0237 is 6 N/10 mm or more when measured in an environment with a temperature of 23 degrees C and relative humidity of 50%, and 1 N/10 mm or less when adhesive force measured in an environment with a temperature of 70 degrees C and relative humidity of 5% or less. The tackiness on the functional layer side is 5 or more as the ball number in the ball tack test according to JISZ0237. USE - Adhesive tape used for concrete structures such as bridges and tunnels for repairing cracks of concrete structures. ADVANTAGE - The adhesive tape can be easily applied to cracked cement-based structure at the time of inspection, and easily peeled off without adhesive residue when necessary and can suppress deterioration of cement-based structures and prevent the expansion of cracks in cement-based structures during construction. The adhesive tape can be attached by an inspector of cement-based structures by simple method immediately after inspection. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method of using the adhesive tape, which involves preparing the adhesive tape, attaching the functional layer side of the adhesive tape to the deteriorated portion of the cement-based structure, leaving the cement-based structure to which the adhesive tape is attached in a natural environment for a certain period of time, heating the adhesive tape at 60 degrees C or more to reduce the adhesive strength of the adhesive tape and peeling the adhesive tape having reduced adhesive strength from the cement-based structure. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of the adhesive tape. Adhesive tape (10) Base material (11) Adhesive layer (12) Functional layer (13)