Cracking prevention agent at concrete site of concrete structure, method of constructing concrete structure having joint site and method of tunnel construction

摘要

PROBLEM TO BE SOLVED: To provide an anti-cracking agent at a joint of a concrete structure, a method of constructing a concrete structure having a joint, and a method of constructing a tunnel capable of preventing the occurrence of a crack along a joint, enhancing the workability of the work therefor and shortening the working time thereof.;SOLUTION: The joint anti-cracking agent of the concrete structure comprises 40 to 77 wt.% of a fatty acid-containing compound, 2 to 5 wt.% of a stabilizer, 1 to 3 wt.% of a surfactant, and 15 to 52 wt.% of ion-exchanged water. After casting the precast concrete, the anti-cracking agent of the joint of the concrete structure is applied to the joining surface of the precast concrete, and post-casting concrete is placed in contact with the joining surface coated with the anti-cracking agent.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT