| abstract |
The present invention relates to a setting regulation admixture that is for adding to an ultra-rapid-hardening cement composition so as to regulate the setting start time of the ultra-rapid-hardening cement composition. This setting regulation admixture is characterized by being a compound that includes, in a mass ratio of 1:0.5-1:3: at least one setting regulator selected from the group that consists of inorganic carbonates, oxycarbonic acid, sodium aluminate, and sodium sulfate; and an inorganic powder. |