Why Do Expansive Soils Grow So Much?

Expansive soils have clay minerals that expand when wet. Sulfate salts also expand with temperature changes. When the soil has a large amount of an expansive mineral or salt, it has the potential for dramatic expansion.

Expansive soils have clay minerals that expand when wet. Sulfate salts also expand with temperature changes. When the soil has a large amount of an expansive mineral or salt, it has the potential for dramatic expansion.

Therefore, these types of minerals and salts absorb more moisture than other types of minerals, making them responsible for the dramatic expansion and shrinkage you see in clay soils.

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