Self-levelling compositions of hydraulic binders for screeds or floor coverings

The present invention relates to a kit for preparing a self-levelling screed or floor covering, characterised by including: a mineral component, which is a self-levelling mortar in powder form including one or more additives, at least one of which is a rheological additive such as a plasticiser and/or superplasticiser, the quantity of additives being between 0.01 wt % and 20 wt % of the mortar; and 0.1 wt % to 15 wt % relative to the mineral component, preferably 0.1 wt % to 10 wt % of an organic component which is a photocurable liquid composition.