| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a packing material composition which has small shrinkage rate when hardened, has rapid hardenability and is excellent in injectability and hardness or strength properties after hardened, and to provide a method for repairing a cement asphalt mortar layer of a slab track by using the packing material composition.SOLUTION: The packing material composition contains: 100 pts.mass of a resin composition, which has 0.08 or lower ratio of the tensile strength [N/mm] to the elongation [%] at break when a tensile test is conducted, as the physical property thereof after hardened, by using a test piece prepared according to JIS K 6251,; and 100-300 pts.mass of aggregate. The resin composition is mixed with the aggregate while keeping them at 20°C so as to uniformly disperse the aggregate and then a hardening agent is thrown in an obtained mixture and agitated/mixed therewith. The density of the hardening agent-mixed mixture is defined as D1. The packing material composition is casted into a molding flask at the atmospheric temperature of 20°C, hardened/aged and cut into hardened bodies each having predetermined size. The density calculated by using the mass of the hardened body is defined as D2. The hardening shrinkage rate calculated by using an expression:{[(D2-D1)/D2]×100} is 6% or less.</p> |
