What is the primary purpose of stoning in concrete surface preparation?

The primary purpose of stoning in concrete surface preparation is to smooth the surface. This process involves using a rough abrasive material such as stone to refine the texture of the concrete, which can help eliminate any imperfections or rough spots. A smooth surface is essential for ensuring that subsequent coatings adhere properly and perform effectively.

While improving surface smoothness may indirectly contribute to adhesion and reduce surface absorbency, the main intention behind stoning is to achieve that refined, even finish. This smoothness can also enhance aesthetic appeal and ensure that surfaces are suitable for later applications, such as paints or sealers, which may require a specific surface condition to bond properly.