Improving the soil in place by adding lime, hydraulic binder and increasing compaction is widely used to carry out geotechnical works. Laboratory test campaigns are conducted to validate the treatment and its consistency with the expected mechanical properties. They allow on the one hand to follow the mechanical evolution due to hydration of the cement phases and on the other hand to observe the soil response under various stresses. The standards for treated soils recommend carrying out tests on specimens which have undergone curing conditions in airtight packaging, at a temperature of 20°C and atmospheric pressure. However, if these normalized conditions represent the conditions of a low height embankment, when the structure is of great height it is interesting to take into account the pressure to which the material is subjected during its curing. The study focused on comparing the evolution of the mechanical properties of silt treated with lime and hydraulic binder then compacted, when it was subjected to a normalized cure or a confined cure of 500 kPa. In order to monitor the mechanical gain of the confined specimen regularly and without modifying its curing conditions, a resonant column apparatus (RCA) in torsion mode was used. With this device carrying out measurements of the shear modulus in very small deformations, the curing and testing phases could be coupled, the tests not being destructive. The curing stress brings the expected properties more quickly and confers superior properties of around 15% in the long term.