How do you stabilize expansive soil?
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.
Which type of foundation is suitable for expansive soil?
Strip footing: Strip footing is suitable when the soil, through expansive, little swelling pressure. When the soil swells, the sand grains would yield by moving up, thus reliving the swelling pressure. These type of foundations are mostly used for medium loads.
What are the foundation techniques in expansive soils?
Foundation on expansive soil Minimum depth of foundation should be 2 m. The bottom of the foundation trench should be filled with sand or murrum or broken stones. Sand filling on sides of trench is also recommended. Reinforced concrete bands should be used at the foundation, plinth and lintel levels.
What type of foundation is best for clay soil?
When it comes to clay soil, the best house foundation would be between a drilled pier foundation or a slab-on-grade foundation. Drilled pier foundations will anchor deeper into the clay for more structural stability while slab-on-grade foundations combat clay soil’s tendency to shrink and expand.
Can you build a foundation on clay?
However, since clay soils may be highly compressible, it is important to take the necessary precautionary measures to reduce the risks of foundation settling. If you must build in an location where soils are clayey, you must take all precautionary measures to reduce these risks of settling.
Which foundation is best for clay soil?
The answer is a pier and beam foundation. This consists of thick wooden beams that are installed deep into the ground called piers. Beams are then laid across the piers to hold up the structure above the soil.
How do you fix expansive clay 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. These methods of trying to minimize the swell potential of the clay are costly, destructive, and disruptive to the environment.
Which method is most appropriate to improve the geotechnical properties of expansive soil?
Utilization of lime to stabilize the soil is an effective method to overcome swell and shrinkage problems in the expansive soil. Lime stabilization has some benefits to the soil such as enhanced workability, higher strength, and bulk stability.
Why is clay soil not suitable for a foundation?
Soils rich in clay and silt have the greatest potential to damage a foundation. Clay absorbs water easily, expanding in volume as it becomes more saturated. So-called “expansive clays” can cause foundations to crack, heave and shift.
Is expansive soil good for foundation?
In some areas expansive soils can do significant damage to a foundation because there are types of expansive soils that may exert an uplifting pressure as high as 5,500 (PSF) pounds per square foot on the foundation. This can easily crack or damage a foundation.
What is the most commonly used material for Stabilisation of soils?
Cement. One of the most popular options for stabilizing soil is cement. Once the soil has been mixed with cement, it’s known as soil cement. This material can be used in a variety of soil types, making it extremely versatile.
Which is the most effective stabilization method for foundation of residential building?
Lime Soil Stabilization Method Lime stabilizations method is most widely utilized in geotechnical and environmental applications.
Should you buy a house on expansive soil?
In those areas where expansive soils are a known problem, professional inspection for the presence of expansive soils or foundation damage caused by expansive soil should be done before purchasing a home. Small areas of expansive soils occur almost anywhere so inspection is never a bad idea.
How do you compact clay soil for foundation?
Soil can be mechanically compacted by applying force with a roller, hoe or rammer. A roller looks like a drum aerator, minus the spikes. Pulling this weighted metal drum over the lawn crushes the soil. In a pinch, a heavily loaded wheelbarrow can do the same job.
Which of the following methods is most effective for stabilization i heavy clays?
Slaked lime is very effective in treating heavy plastic clayey soils. Lime may be used alone or in combination with cement, bitumen or fly ash. Sandy soils can also be stabilized with these combinations. Lime has been mainly used for stabilizing the road bases and the subgrade.
How deep should foundations be in clay?
750mm
Seasonal changes affect clay soils – causing them to swell in winter and shrink in summer. That’s why there are minimum foundation depths for each type of clay. Strip, trench fill or pad foundations must be cast at a minimum of 750mm in low plasticity clays, 900mm in medium, and 1000mm in the highest risk areas.
What is the best soil stabilizer for expansive soils?
To mitigate expansive soils CST uses AGSS-ICS, a state of the art Ionic Clay Soil Stabilizer that has been developed to treat swelling clays. The product works in two ways. It reduces the swell potential of the clay soil and, because it dramatically reduces the capillary action of the clay particles, minimizes the shrinkage potential.
What is expansive soil?
Expansive Soil Remediation Treatment Expansive soils are some of the most widely distributed and costly geologic hazards. To mitigate expansive soils CST uses AGSS-ICS, a state of the art Ionic Clay Soil Stabilizer that has been developed to treat swelling clays.
What drives ground heave in expansive clay?
Ground heave or settlement of expansive clay soil depends on several factors: soil mineralogy and composition, the level of water in the soil, and the presence of vegetation (species dependent) on a site ( Kalantari, 2012 ).
How does clay soil affect your foundation?
Here are some tips for preventing foundation problems in expansive clay soil environments. When clay soil expands, it can place immense amounts of pressure on your home’s foundation. Over time, your foundation’s walls can bend inwards and in some cases even crack.