Lime soil stabilization is a technique used to enhance soil properties, such as density and bearing capacity, by introducing lime into the soil. This method proves effective in various scenarios, but understanding the process and factors influencing its success is crucial for optimal outcomes.
When lime is added to clayey soil, it initiates a cation exchange, boosting plastic limit and reducing plasticity index. This exchange increases soil stability, particularly beneficial for clayey gravel. This stabilized mix finds application in constructing sub-bases and base courses for pavements. However, its suitability varies with temperature, making it more appropriate for warmer regions.
The mixing process involves several steps to ensure effective lime-soil stabilization:
The soil requiring stabilization is scarified and pulverized using suitable equipment.
Lime is introduced either in powder form or as a slurry, with the latter often recommended for better mixing. In cases of lime powder, water is sprayed over the soil.
The mixture is left for 1 to 4 days, allowing time for the slow lime-soil reaction.
After the initial waiting period, the remaining lime content is added and mixed thoroughly.
The soil is spread to the required grade and compacted using rollers to achieve the necessary maximum dry density.
The compacted lime-soil layer undergoes moist curing for a week.
Tests are conducted to assess water content and maximum dry density of the compacted soil.
Several factors impact the success of lime-soil stabilization, each playing a vital role:
In conclusion, lime-soil stabilization is a versatile method with nuanced considerations, ensuring its effectiveness in diverse soil types and environmental conditions.