| abstract |
(57) [Summary] [Problem] To provide a quick-setting concrete for prelining and a method for manufacturing the same, which can recover the fluidity when the fluidity decreases due to an increase in the concrete temperature or the like. SOLUTION: After mixing cement, a hardened material containing calcium aluminates and calcium sulfate, and a liquid setting modifier containing an alkali metal carbonate and an organic acid, a liquid setting modifier is further added. Mixing to produce hardened concrete, then pumping the hardened concrete through a concrete pumping pipe with a concrete pump to the casting site, and mixing it with the liquid quick-setting material before the face to make quick-setting concrete A method for producing quick-setting concrete for prelining. |