How additives work

Principle of operation and effect on the soil

Technology effect on the soil

Increasing the resistance of soil to capillary water absorption in road applications mainly uses the on-site mixing method (sporadically, in stationary mixing plants). The process starts with adding to soil hydrophobic chemical additives, designed to change soil properties. After that, soil and additive are mixed using specialized mixing machines. Finally profiling and compaction is performed. Due to the effect of additives, the soil can be compacted to a greater extent. Also the processes of capillary water absorption into the pavement layer material is stopped.

NATURAL SOIL STATE

COMPACTED SOIL

COMPACTED SOIL AFTER HYDROFOBIZATION

Flexibility and durability

An important feature of stabilization with hydrophobic additives is the mixed structure of the resulting material – rigid aggregates of the spider-like cement grid and filling in the form of non-bonded soil particles. The rigid cement grid improves the load-bearing capacity of the layer, and filling with soil particles gives the structure flexibility, thanks to the ability to absorb external forces.

The requirement for the creation of such a structure are two very important things:

-optimum content of hydraulic binder, not exceeding the limit of stiffness of the layer,

-optimum content of silt and clay fraction particles, allowing the flexible work of the layer.

This structure of the stabilized material causes minimal shrinkage, therefore no dilatation of the resulting layer is required.

The use of hydrophobic additives uses this effect and fixes it over time by hydrophobizing the material. This allows to maintain the high quality of the layer and allows homogeneous work regardless of water and temperature conditions.

SOIL WITH A SMALL QUANTITY OF CEMENT

RIGID AGGREGATES OF THE CEMENT GRID AND SOIL FILLING WITH THE OPTIMUM CLAY AND SILT FRACTION CONTENT

Traditional stabilization

AFTER TIME IN A SITUATION WHERE A HYDROPHOBIC ADDITIVE WAS NOT APPLIED

WATER PENETRATION DAMAGES THE STRUCTURE OF STABILIZATION -> DEGRADATION OF PARAMETERS

Hydrofobized stabilization

AFTER TIME IN A SITUATION WHERE A HYDROPHOBIC ADDITIVE WAS APPLIED

LACK OF WATER -> PARAMETERS MAINTAINED

nascon leaf

Safety

The use of hydrophobic additives is completely safe for people and the environment. Safety tests and tests confirming the lack of negative impact on the nature were carried out at the Department of Environmental Monitoring and at the Silesian Botanical Garden in Poland.