Activator composition for latent hydraulic and/or pozzolanic binder materials

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An activator composition, in particular suitable for activating latent hydraulic and/or pozzolanic materials in binder compositions, comprises or consists of : a) a first component A, comprising or consisting of an alkali metal salt and/or an earth alkali metal salt; b) a second component B, comprising or consisting of a metal sulfate; c) optionally, a third component C, suitable for accelerating the hardening of a hydraulic binder material; d) optionally, a filler material; with at least the components A, B and C, if present, being chemically different.