What is the most common finishing sequence for a typical slab on grade?

• A. Screed, cure, edge work, final trowel
• B. Pour, cure, seal
• C. Screed, bull float, edge/joint work, float with darby or handheld float, then a final steel trowel finish
• D. Screed, bull float, edge/joint work, final trowel with no broom texture

Answer: (C)

The sequence shown reflects how a typical slab on grade surface is developed to be level, smooth, and durable, while properly managing moisture and imperfections. Start with a screed to bring the concrete to the correct level and begin to consolidate the surface. Next, use a bull float to push down aggregate, close surface irregularities, and start smoothing without sealing in all moisture. Then handle edges and joints so the perimeter and control joints are true and ready for finishing. After that, float with a darby or handheld float to fill remaining voids, bring up a uniform texture, and work the surface to a consistent finish while bleed water is still present. Finally, apply the final steel trowel finish to achieve a dense, smooth surface. This order avoids trapping moisture too early, ensures a uniform surface, and provides the best chance for a high-quality finish. Other options omit or misplace steps like curing or the intermediate floats, which can lead to surface flaws or improper timing.