| abstract |
(57) Abstract: A cement-based setting retarder and a cement-based hardening accelerator comprising one or more compounds selected from triethanolamine, diethanolamine, and monoethanolamine. A ground improvement compounding agent characterized by the following. The compound for improving the ground of the present invention is blended at the time of producing the hydraulic composition, whereby the hydraulic composition has the same dispersibility as when only the conventional cement-based setting retarder is added. However, in the early age (1-7 days), As compared with the case where only a conventional cement-based setting retarder is added, the composition has a greater retardation in setting, and the safety with respect to retardation can be enhanced. In addition, the long-term age (28 days, 9 In one day), it is possible to reliably and rapidly develop strength, which was insufficient with a conventional cement-based setting retarder, and it is possible to increase the safety regarding hardening. |