How an expansive soil is stabilized?

The stabilization of expansive soils by the use of additives such as lime, fly ash or cement is well documented (Du et al., 1999, Nalbantoglu, 2004, Nalbantoglu and Gucbilmez, 2001, Rao et al., 2001, Yong and Ouhadi, 2007) and has traditionally concentrated on the elimination of the expansive power of the soil.

What are the most important methods used on stabilization of expansive soils?

Because of these factors, lime is the most popular agent used to stabilize expansive clay soils.

Which stabilizer is suitable for expansive soils?

Calcium-based stabilizers such as lime and cement control swell and shrinkage behavior and enhance strength properties for expansive soils through the formation of pozzolanic components.

What is the mechanism of swelling of expansive soils?

Swelling soils, also known as expansive soils, are ones that swell in volume when subjected to moisture. These swelling soils typically contain clay minerals that attract and absorb water. When water is introduced to expansive soils, the water molecules are pulled into gaps between the soil plates.

How is expansive soil treated?

Traditionally, ineffective & costly methods have been utilized in treating expansive soil. Methods such as removing it completely and replacing it with fill dirt, pre-wetting and pre-swelling the soil and injecting or mixing of lime or other solutions into existing soils.

What are the problems with expansive soils?

Because of this swelling and shrinking behaviour, expansive soils may cause the following problems in structures or construction projects: Structural damage to lightweight structures such as sidewalks and driveways. Lifting of buildings, damage to basements, and building settlement. Cracks in walls and ceilings.

What are soil stabilization techniques?

There are 3 main methods for soil stabilisation:

• Mechanical stabilisation. This category consists of physical processes such as compacting or tamping with machineries including rollers or rammers.
• Chemical Stabilisation.
• Polymer Stabilisation.

How do you stabilize soil?

The Best Soil Stabilization Methods and Materials

1. Lime. Slaked lime is most often used in the stabilization of subgrades and road bases, particularly in soil that is clay-like or highly plastic.
2. Cement.
3. Bitumen.
4. Chemical Compounds.
5. Geotextiles.
6. Mixing Materials.
7. Grouting.
8. Electrical Stabilization.

What is expansive soil give example?

They usually contain some form of expansive clay mineral, such as smectite or vermiculite, that are able to absorb water and swell, increasing in volume, when they get wet and shrink when they dry. The more water they absorb, the more their volume increases.

How do you deal with expansive soils?

What causes expansive soils?

Expansive soils are soils that expand when water is added, and shrink when they dry out. This continuous change in soil volume can cause homes built on this soil to move unevenly and crack.

What are three types of soil stabilization?

There are three broad types of soil stabilization: biological, physical and chemical.