Red Seal Concrete Finisher Practice Exam

How can the risk of scaling on the concrete surface be minimized?

1. By using appropriate de-icing agents and sealing

2. By applying a thicker layer of concrete

3. By using faster-setting cement

4. By mixing different types of aggregates

The correct answer is: By using appropriate de-icing agents and sealing

Scaling in concrete surfaces occurs primarily due to the formation of ice and the expansion of water within the concrete during freeze-thaw cycles. To minimize the risk of scaling, utilizing appropriate de-icing agents and applying a sealant are effective strategies. De-icing agents, when selected carefully, can help reduce the formation of ice on the surface, while sealing the concrete provides a protective layer that prevents moisture absorption and mitigates the effects of freeze-thaw cycles. This combination of techniques significantly reduces the potential for surface damage and scaling. The other options do not address the root causes of scaling. For instance, applying a thicker layer of concrete might increase the mass but does not inherently improve resistance to climate effects. Using faster-setting cement does not contribute to scaling prevention, and mixing different types of aggregates primarily affects the concrete's strength and workability rather than scaling susceptibility. Thus, the chosen approach of combining de-icing agents and sealing is the most effective and relevant method for minimizing the risk of scaling on concrete surfaces.