This International Standard defines test procedures for determining the mechanical Performance of precast concrete floors made of a Single piece, or made up of precast joists (reinforced concrete or precast concrete) completed with filler blocks and concrete poured in situ. The Parameters measured are: - the maximum load, by progressive loading, which does not result in collapse, - the instantaneous and deferred deformations under imposed load, and - the maximum load which the floor or its constituent precast elements tan support without collapse during its construction. This International Standard applies to the testing of floors desipned to support loads of less than 5 000 Ngrn- and having spans of less than 12 m.