It is an additive used to speed the setting and hardening of cement, mortar and concrete, especially shortcrete. It is used for railway / highway tunnells, shafts / drifts and excavations in all mines and other underground engineerings such as hydroelectricity, military industry and civil air defence etc, also suitable for civil construction projects which are required to commission as early as possible and to quichen the solidifying and hardening of ground surface. This product pass the test of Sudbury Lab. In Canada.