Improving The Engineering Properties of Expansive Clayey Soils by Adding Biopolymer: A Review

This is the authors' abstract. We don't add key points for this paper.

Globally, expansive soils are mostly found in arid and semi-arid regions. These soils have a considerable potential for swell-shrinkage because of the presence of montmorillonite clay. Expansive soils experience swelling; they are also known as shrink-expand or swelling soils. when exposed to moisture, and when the moisture content drops, shrink .Because of their different wetting and drying characteristics, they cause structural damage to structures and pavements. Several stabilizers and techniques have been applied to stabilize the soil and make it more suitable for construction purposes. The main objective is the search for suitable soil stabilizers to address the challenges presented by expansive soils, not only in terms of their essential geotechnical features, but also in terms of both economic and environmental issues, an alternative Environmentally-friendly stabilizers termed as (Polymer) was used to treat expansive soils .This reviews some researches into the use of polymer and biopolymer in improving clayey soil ,also their effect on soil swelling .