| abstract |
(57) [Summary] [Problem] To provide a method for producing quick-set concrete for prelining, which can ensure fluidity, exhibit initial strength, etc., and can quickly and independently stand the end face of filled and poured concrete. . SOLUTION: A cement, a hardened material containing calcium aluminate and calcium sulfate, and an aqueous setting agent containing an alkali metal carbonate and an organic acid are mixed to produce a hardened concrete, and then the hardened concrete is produced. Is supplied to a casting site through a concrete pumping pipe by a concrete pump, and a quick-setting material is supplied in front of the face to produce quick-setting concrete, thereby producing quick-setting concrete for prelining. |