What soil type typically requires more aggressive compacting techniques?

Clay soil typically requires more aggressive compacting techniques due to its physical properties. Clay has very fine particles that tend to stick together and have high plasticity. When it is wet, clay can become quite soft and lose its stability, while when it's dry, it may shrink and form cracks. The compacting process needs to overcome the cohesive forces in clay particles to achieve the necessary density for construction projects.

Aggressive compacting techniques, such as the use of heavy rollers or specifically designed equipment, are necessary to achieve the desired level of compaction and to reduce the risk of settlement or expansion after construction. This ensures that the clay forms a stable foundation that can support structures adequately.

In contrast, sandy soil has larger particles and drains well, requiring less aggressive compaction. Loamy soil, a mix of clay, sand, and silt, balances the need for compaction with its natural drainage abilities, while gravel compacts easily due to its larger particle size and angular shape, making it less reliant on aggressive compaction methods.