The subject matter of the present invention relates to a blend comprising an epoxy resin, a cyclic carbonate, and a hardener comprising a polyalkoxypolyamine, another amine, and a catalyst, to a process for producing said blend, to the use of the blend of the invention for producing cured epoxy resin, and also to an epoxy resin cured with the blend of the invention, and in particular to fiber-reinforced cured epoxy resins for use in rotor blades for wind turbines.