| abstract |
PROBLEM TO BE SOLVED: To provide a method for producing quick-setting concrete for pre-lining, in which the mixing property of quick-setting concrete is improved, variation in strength development can be suppressed, self-supporting properties can be secured, and self-standing time can be adjusted. . SOLUTION: A cement, a rapid hardening material containing calcium aluminate and calcium sulfate, and a liquid setting modifier containing an alkali metal carbonate and an organic acid are mixed to produce a quick hardening concrete, and then the quick hardening concrete is produced. Is pumped through a concrete pumping pipe by a concrete pump to a casting site, and the solid content concentration is 25 to 4 before the face. A method for producing quick-setting concrete for prelining, which is mixed with 5% by mass of a liquid quick-setting material to form a quick-setting concrete. |