Red Seal Concrete Finisher Practice Exam

What does the term "joint sealing" entail in concrete finishing?

1. Applying a sealant to joints to prevent water infiltration and damage

2. Pouring concrete into molds to create joints

3. Removing excess concrete from joints

4. Filling joints with sand for flexibility

The correct answer is: Applying a sealant to joints to prevent water infiltration and damage

The term "joint sealing" in concrete finishing specifically involves applying a sealant to the joints in concrete surfaces. This is a critical process aimed at preventing water infiltration, which can lead to a range of issues, including damage to the concrete itself and the subgrade materials beneath it. By sealing the joints, one protects against moisture penetration that could cause freeze-thaw cycles, leading to cracking and deterioration over time. The importance of addressing joints through sealing cannot be overstated, as these joints are natural weak points in a concrete structure. Proper joint sealing ensures durability and extends the lifespan of concrete installations by mitigating the effects of environmental elements and reducing maintenance needs. Other options discuss aspects of concrete finishing but do not accurately define what joint sealing entails. For example, pouring concrete into molds pertains to the initial forming process rather than the finishing aspect. Removing excess concrete is related to achieving a smooth surface, while filling joints with sand is not a sealing procedure; it may provide some flexibility but does not effectively prevent water infiltration.