CEN/TC 396/WG 3 - Construction procedures

This European Standard applies to the treatment with binders of natural soils, weak rocks, intermediate rocks, 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 in layers, produced for earthworks in situ or from a mixing plant, 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, 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 relates to the short term performance.
For stabilization, the classification relates to the medium to long term performance.
NOTE 2   FprEN 16907-4 prepared by CEN/TC 396 “Earthworks” is for improvement and stabilization in earthworks applications. EN 14227-15 prepared by CEN/TC 227 “Road materials“ is for stabilization only in pavement applications.
NOTE 3   For stabilization, the performance classification specified in FprEN 16907-4 uses generally the same laboratory performance classification specified in EN 14227-15, except for the performance classification diagram according to “Rt and E” specific to pavements in EN 14227-15, which has been replaced in FprEN 16904-4 by a performance classification diagram according to “Rt and E” specific to earthworks (Figure 1).

This European Standard provides execution procedures for excavating, transporting and placing soils and rocks for the construction of earth-structures and guidance for the work. Additionally, it includes excavation and placement of rock materials underwater.
Dredging of soils and the associated hydraulic placement of fills are covered by EN 16907-6 and EN 16907-7.
Execution of earthworks follows the conclusions of the earthworks design and optimization phase (EN 16907-1), which should anticipate soil and rock specificities and their suitability. In case some events could not be foreseen, additional design is performed during the execution of works.