Full Depth Reclamation

Before discussing the FDR process, a brief introduction of sub base stabilization and base stabilization is as follows:

Soil Stabilization

Soil stabilization is the process of blending and mixing materials with soil to improve certain properties of the soil. The process may include blending of soils to achieve a desired gradation or mixing of commercially available additives that may alter the gradation, texture or plasticity, or act as a binder for cementation of the soil. Additive stabilization is achieved by the addition of proper percentage of cement, lime, fly ash, or combinations of these materials to the soil

Mechanical Stabilization

Mechanical stabilization is a process in which materials are proportioned to obtain desired gradation and plasticity of the mix. This type of stabilization adds selected aggregate sizes or RAP to the pulverized existing materials to create a stronger sub-base. Mechanical stabilization can be used in combination with asphalt or chemical modification.

Cement Stabilization

Generally granular soils are suitable for cement stabilization.
Lime Stabilization – Clayey soils including heavy clays, Mourn and other soils met with in alluvial plains can be effectively treated with lime. In case of highly plastic soils, two stage stabilization is adapted Soil is first treated. with a small quantity of lime. Later on the soil may be treated with remaining quantity of lime or with cement to achieve the desired strength.

Sub base stabilization

A stabilized and therefore stiffer, sub base provides greater load spreading ability and hence reduces stresses imposed on the subgrade. When stabilized the sub base provides much of the structural rigidity in the pavement, and also assists during the compaction of the upper granular layers and hence increases their ability to withstand deformation.