What is the main purpose of filling voids during surface preparation?

Filling voids during surface preparation primarily aims to stabilize the test surface. When voids are present, they can lead to unevenness, potential weaknesses, and instability in the surface being prepared. A stable test surface is essential for ensuring accurate results in subsequent tests and measurements, such as those related to soil compaction or structural integrity.

While other aspects, such as preventing water accumulation and improving soil compaction, may also be important considerations in certain contexts, the stabilization of the surface takes precedence during the initial preparation phase. This foundation is crucial for achieving reliable outcomes in any earthwork operations that follow.