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ing to USBR (Holtz and Gibbs 1956), the criterion for the classification of degree of soil expansivity is the total volume change of a soil from air dry to a saturated condition under a surcharge of 7 kPa in an oedometer (Table 8).
How to determine if a house is built on expansive soil?
How to Identify Expansive Soils? Substantially ed asphalt streets and sidewalks. A pattern of uplifted sidewalks. Separations between the residence and the sidewalks or concrete flatwork. Substantially ed stucco. For older homes with red brick fireplaces, the fireplaces are leaning or ed.
How do you fix expansive soils?
One can stabilize expansive soil and prevent heaving when it is mixed with fly ash, lime, or cement. Chemical stabilization is essentially cementing clay particles into place in such a way that they cannot grow in volume.
Do expansive soils expand as they dry?
Expansive soils owe their characteristics to the presence of swelling clay minerals. As they get wet, the clay minerals absorb water molecules and expand; conversely, as they dry they shrink, leaving large voids in the soil.
Can you build on expansive soils?
Yes, you can build on top of expansive soil. However, it must be done correctly, and this requires consultation with a geotechnical engineer.
Techniques such as proper grading and drainage systems can help control water infiltration and reduce the soils exposure to moisture fluctuations. Chemical Stabilization: Chemical additives can be introduced to the expansive soil to modify its properties and reduce its swelling potential.
What is the problem with expansive soil?
Expansive soils are problematic and susceptible to ground movements, causing significant damage to overlying structures and reduction of bearing capacity. Geotechnical engineering has long recognized that the moisture variation triggers the expansive nature of soils resulting in its swell and shrinkage.
How do you stabilize expansive soil?
The grouting technique is adopted in this study to improve the strength of expansive soil by using different percentages of lime to improve the soils shear strength, reduce settlement and reduce both the free swelling and swelling pressure.
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by SY Amakye 2021 Cited by 69 Expansive soils are problematic soils which pose a risk to the safety of civil engineering structures. These soils can be treated by compaction or by adding
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