Method for accelerating and fluidifying wet concretes or mortars compositions comprising an activating agent, a water reducing polymer, consisting in using performance additive including chaotropic ions and its use in low carbon alternative binder compositions

A method for fluidifying wet concrete or industrial mortar compositions comprising:

• (a) at least one hydraulic binder,
• (b) at least one water reducing polymer,
• (c) at least one accelerator in the form of a salt containing at least one kosmotropic ion,
• (d) water, and
• (e) optionally one or more supplementary cementitious materials, and
• (f) optionally one or more filler materials,
• the method comprising a step of adding of at least one salt (ch) including at least one chaotropic ion to the concrete or industrial mortar composition, wherein water (d) is present in a weight ratio of water to hydraulic binder (d/a) between 0.25 and 0.45.