> The NF EN 16907-4 standard deals with the soil improvement using lime and / or hydraulic binders.
This part 4 of the standard has more than 100 pages and develops procedures related to the different types of materials defined in part 2 of the same standard.
The Rincent Ile de France Nord agency carries out soil improvement studies in laboratory and monitors the works of in place soils improvement.
The laboratory tests first identify the materials to be improved. Then, standardized tests are performed to evaluate the suitability of these materials to the improvement.
Most commonly it is with lime and cement that soils are treated. It is a question of obtaining mechanical characteristics compatible with the requirements of the building site. For example, obtaining an Immediate Bearing Index which guarantees the movement of the machines on the site is one of the first requirements, followed by the mechanical characteristics of the treated material.
These tests are supplemented by volumetric swelling measurements which must remain below the limits indicated in the soils treatment standard.
The final choice of the type of treatment takes into account the economic constraints related for example to the cost of the binder and the daily cost of stopping an earthworks site.
When carrying out the works, the control may be performed on the water content of the soil to be treated, the quantity of applied binder, see the attached photo of weighing and the bearing capacity of the platforms.
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