| abstract |
(57) [Problem] To provide a quick-setting concrete for prelining and a method for manufacturing the same, which can secure a stable slump holding time without reducing the effect of the setting agent even if the amount of the liquid setting agent used is small. Offer. SOLUTION: A liquid coagulation control comprising mixing a cement and fine aggregate in advance, mixing a hardened material containing calcium aluminates and calcium sulfate, and then containing an alkali metal carbonate and an organic acid. The hardened concrete is manufactured by mixing the agent, then the hardened concrete is pumped to the casting site by a concrete pump through a concrete pumping pipe, and further mixed with the liquid quick-setting material just before the face to form the quick-hardened concrete. A method for producing quick-setting concrete for prelining, comprising: |