What is the percentage of expansion on clay soil that has been excavated?

When clay soil is excavated, it tends to undergo a significant expansion upon exposure to air and moisture changes. This is due to the soil's unique composition and physical properties. Under normal conditions, excavated clay can expand up to approximately 25%. This means that when it is removed from its natural setting and comes into contact with air, it absorbs moisture and increases its volume.

This characteristic is crucial for construction projects as it influences how foundations and structures laid on or in clay soil are planned and managed. Understanding this percentage helps engineers and contractors make informed decisions regarding compaction, grading, and overall structural stability. Overlooking the potential expansion could lead to issues like settling or cracking in foundations and other structures. Thus, 25% is recognized as a standard percentage for the expansion of excavated clay soil, making it the correct response.