Red Seal Concrete Finisher Practice Exam

Which method is commonly used for curing concrete?

1. Using heat lamps

2. Covering it with wet burlap or plastic sheeting

3. Spraying with a chemical curing agent

4. Pouring additional water over the surface

The correct answer is: Covering it with wet burlap or plastic sheeting

Covering concrete with wet burlap or plastic sheeting is widely recognized as an effective curing method because it helps to maintain moisture levels in the concrete as it sets. Proper curing is crucial in achieving the desired strength and durability of concrete, as it allows hydration to occur gradually, minimizing the risk of cracks or surface defects. Wet burlap or plastic sheeting creates a barrier that retains moisture, preventing evaporation. This is especially important in hotter and drier climates where rapid evaporation can hinder the curing process. The use of these materials ensures that the surface remains moist while allowing the concrete to cure evenly, which is vital for achieving optimal performance in the finished product. While the other methods listed can also be employed in specific scenarios, they may not provide as consistent or suitable conditions for curing as wet burlap or plastic sheeting. For example, heat lamps can be used in cold weather but might risk drying out the surface too quickly. Spraying with a chemical curing agent can be effective, but it may not provide the same level of moisture retention as wet covering methods. Pouring additional water over the surface can lead to over-saturation or pooling, which could weaken the concrete instead of aiding its curing.