A resin mixture is described, comprising at least one compound that can be radically polymerized, at least one reactive diluent selected from 1,3-dicarbonyl compounds, and at least one polymerization inhibitor, selected from stable N-oxyl-radicals or 4-hydroxy-3,5-di-tert-butyl toluene, with the molar ratio of at least one 1,3-dicarbonyl compound and the polymerization inhibitor ranging from 30:1 to 150:1, a reaction resin mortar comprising said resin mixture, a two-component or multi-component system, as well as the use for construction purposes, particularly for the chemical fastening in mineral undergrounds.