Red Seal Concrete Finisher Practice Exam

What is the purpose of using a float in concrete finishing?

1. To smooth out the surface

2. To apply color

3. To remove air bubbles

4. To create a rough texture

The correct answer is: To smooth out the surface

The primary purpose of using a float in concrete finishing is to smooth out the surface of the concrete after it has been poured. A float helps to level the concrete, filling in any low spots and imposing a smooth finish that is essential for aesthetic and functional purposes. This process is crucial in ensuring that the surface is free of excess water, which can lead to problems such as scaling or blistering later on. As the float is used, it pushes aggregate down into the mix while bringing some of the finer cement paste up to the surface. This creates an even and polished appearance. The smoothness achieved with a float is important for many types of concrete applications, including sidewalks, driveways, and floors, where a flat and even surface is required for both safety and visual appeal. Other functions such as applying color, removing air bubbles, or creating a rough texture are accomplished using different tools or techniques and are not the main purpose of a float.