Soil stabilization is required most of the times in order to meet an engineering purpose. You can use physical, biological, chemical or combined methods to change a natural soil. Soil stabilization is used for some particular reasons. One reason is to change the California Bearing Ration for by 4 or 6 times. Another reason we may use soil stabilization is to create solid and really strong sub-base and base courses. Also, in may countries, they may use soil stabilization in order to construct roads. It will be interesting to see some techniques and procedures of soil stabilization.
Common soil stabilization procedures
Use of lime
There are more than one soil stabilization procedures and techniques. First of all a way to achieve soil stabilization is by using lime. It is capable of treating heavy plastic clayey soils. You can use it alone or combine it with other materials like fly ash, bitumen or cement. This combination can also be effect in sandy soil stabilization. On this point we should note that its use is the best for road bases and the subgrade.
Now let us talk about the procedure. What lime does is to change the nature of the absorbed layer. Also, lime provides pozzolanic action. The addition of lime with soil has, as a result, the reduction of the plasticity index of highly plastic soils. In the meantime, it increases the optimum water content. On the contrary, it contributes to the decrease of the maximum compacted density. Another important result is that the addition of lime helps to increase the strength as well as the durability of the soil.
Another type of soil stabilization is soil stabilization by the use of chemical means. Calcium chloride is the chemical that is used for this process. They mostly use as water retentive additive in mechanically stabilized soil bases and surfacing. The use of calcium chloride has many results. First of all, it lowers the vapor pressure. Secondly, it increases the tension of the surface. Also, calcium chloride decreases the rate of evaporation.
Calcium chloride does even more things though. It lowers the freezing point of pure water and it greatly prevents frost heave. Also, it works as a soil flocculent. Another thing that calcium chloride does is to facilitate compaction. You may need to apply it frequently in order to cover any possible loss of chemical.
Even you don’t want to use calcium chloride you may need to use sodium chloride. Sodium chloride can be combined with other chemicals (including calcium chloride) in order to achieve the desiring results.