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Screed boards are essential tools used in concrete work primarily for leveling and smoothing freshly poured concrete. When concrete is poured, it is typically in a somewhat fluid state, allowing it to fill in the forms. However, achieving a perfectly level and flat surface requires precision, and this is where a screed board comes into play.

A screed board is typically made of wood or metal and is dragged across the surface of the wet concrete. By moving the board in a back-and-forth motion, concrete workers can ensure an even distribution of the material, removing excess concrete while simultaneously filling in low spots. This process helps create a smooth and even surface that is crucial for the final quality of the concrete slab.

In terms of other options, while decorative patterns can be created in concrete work, screed boards are not designed for that purpose. Measuring thickness can involve different tools and techniques, and reinforcing concrete forms doesn’t utilize screed boards either, focusing instead on structural support. Therefore, the primary function of screed boards in concrete work clearly aligns with the need to level and smooth the surface effectively.