| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealant interposed in a joint part of a concrete product, the sealant being excellent in both workability and water cut-off property.SOLUTION: A sealant is interposed in a joint part of a concrete product, and comprises a core layer made of non-water-swelling foam rubber, and a flexible layer disposed on both sides of the core layer and made of water-swelling foam polyurethane. 50% compressive stress of the core layer is between 0.1 and 1 MPa, and 50% compressive stress of the flexible layer is between 0.005 and 0.08 MPa. A ratio between the 50% compressive stress of the core layer and the flexible layer (core layer/flexible layer) is between 2 and 100, and a ratio between thicknesses thereof (a total for core layer/flexible layer) is between 0.1 and 0.4.SELECTED DRAWING: Figure 1 |
