This European Standard applies to the treatment with binders of natural soils, weak and intermediate rocks (including chalk), recycled materials and artificial materials for the execution of earthworks during the construction and maintenance of roads, railways, airfields, platforms, dykes, ponds and any other types of earth structure. It relates only to the treatment by layers for earthworks, as opposed to the treatment by columns for example. The standard specifies the requirements for the constituents of the mixtures, the preliminary laboratory testing methodology, the laboratory performance classification, and the execution and control. NOTE 1 The informative annexes also give example of good practices for execution and control. The laboratory performance classification specified in this European Standard covers the two types of treatment : improvement and stabilization. For improvement, the classification takes into account the short term performance. For stabilization, the classification takes into account the medium to long term performance. NOTE 2 For stabilization, the classification is based on the laboratory performance classification specified in FprEN 14227 15, except for the classification according to tensile strength and modulus ( Rt and E ) which has been replaced by a performance classification according to Rt and E specific to earthworks.