NOVELTY - A blend comprises a) epoxy resin component comprising a1) 75-97 pts.wt. at least one epoxy resin selected from aromatic epoxy resins and/or cycloaliphatic epoxy resins, a2) 3-18 pts.wt. at least one cyclic carbonate selected from cyclic carbonates having 1-10 carbon atoms, and a3) 0-15 pts.wt. at least one reactive diluent; and b) a hardener comprising b1) 10-79 pts.wt. at least one polyalkoxypolyamine, b2) 20-89 pts.wt. at least one other amine, and b3) 0.5-30 pts.wt. at least one catalyst.    USE - As blend useful for producing fiber-reinforced cured epoxy resin (claimed), which is used in rotor blades for wind turbines.    ADVANTAGE - The blend retains sufficient flowability for the vacuum assisted resin transfer molding (VARTM) process to permit production of large fiber-reinforced molding parts, in particular rotor blades for wind turbines, and achieves complete hardening within a short time and moreover complies with or exceeds the stringent mechanical demands required for the use of large fiber-reinforced molding parts, e.g. increased tensile strength, tensile strain at break and flexural strength, and also thermal stability. The sufficient flowability exists especially when the initial viscosity of the blend (at 25 degrees C) is comparatively low and the blend viscosity rises only slowly at elevated temperature (at 40 degrees C). In the case of composite moldings comprising polyvinylchloride (PVC) foam, when the blend is cured, the blend avoids discoloration of the PVC foam to be as far as possible. The moldings of cured blend not only have good static mechanical properties, but also good dynamic stability. The blend has a viscosity at 25 degrees C of smaller than 350 mPas; and has good dynamic stabilities. The cured epoxy resins comprising the blends have good tensile strength, tensile strain at break, and flexural strength. The cured epoxy resin exhibits high level of mechanical properties and has heat deflection temperature (HDT) of above 70 degrees C.    DETAILED DESCRIPTION - A blend comprises a) an epoxy resin component comprising a1) 75-97 pts.wt. at least one epoxy resin selected from aromatic epoxy resins and/or cycloaliphatic epoxy resins, a2) 3-18 pts.wt. at least one cyclic carbonate selected from cyclic carbonates having 1-10 carbon atoms, and a3) 0-15 pts.wt. at least one reactive diluent, where the parts by weight of components (a1) to (a3) always give a total of 100; and b) a hardener comprising b1) 10-79 pts.wt. at least one polyalkoxypolyamine, b2) 20-89 pts.wt. at least one other amine selected from aromatic, aryl aliphatic, cycloaliphatic, heterocyclic and aliphatic polyamines having at least 3 carbon atoms and at least 4 reactive amine (NH) functions in primary and/or secondary amino groups, and b3) 0.5-30 pts.wt. at least one catalyst selected from tertiary amines, imidazoles, imidazolines, guanidines having less than 3 carbon atoms and/or less than 4 reactive NH functions in amino groups, secondary amines having less than 4 reactive NH functions, substituted urea, guanamines and ketimines, where the parts by weight of components (b1) to (b3) always give a total of 100, where the ratio of amino equivalents of the hardener (b) to the equivalent of the entirety of epoxy resin and cyclic carbonate in epoxy resin component (a) used is 0.3-0.9. The reactive diluents (a3) are selected from 1,4-butanediol bisglycidyl ether, 1,6-hexanediol bisglycidyl ether, glycidyl neodecanoate, glycidyl versatate, 2-ethylhexyl glycidyl ether, 8-10C alkyl glycidyl ether, 12-14C alkyl glycidyl ether, 13-15C alkyl glycidyl ether, para-tert-butyl glycidyl ether, butyl glycidyl ether, nonylphenyl glycidyl ether, para-tert-butylphenyl glycidyl ether, phenyl glycidyl ether, ortho-cresyl glycidyl ether, polyoxypropylene glycol diglycidyl ether, trimethylolpropane triglycidyl ether (TMP), glyceryl triglycidyl ether, triglycidyl para-aminophenol (TGPAP), divinyl benzyl dioxide and dicyclopentadiene diepoxide. INDEPENDENT CLAIMS are included for the following:    (1) producing the blend involving mixing the epoxy resin component (a) and the hardener (b) at temperatures below the curing-onset temperature;    (2) producing a cured epoxy resin involving curing the blend at a temperature greater than or equal to the curing-onset temperature; and    (3) a cured epoxy resin obtainable via curing of the blend at a temperature greater than or equal to the curing-onset temperature.