NICET - Highway Construction Inspection Practice Exam

What is a protective surface treatment for a concrete bridge deck?

1. Sand coating

2. White membrane curing compound

3. Bitumen layer

4. PVC membrane

The correct answer is: White membrane curing compound

In the context of protective surface treatments for concrete bridge decks, a white membrane curing compound is designed to protect the curing process of the concrete and, in some cases, provide a form of surface protection. This type of treatment is applied to freshly placed concrete to retain moisture, which is essential for the hydration process. The white pigment in this compound reflects sunlight, helping to keep the surface temperature of the concrete lower, which can reduce the risk of thermal cracking. The use of a white membrane curing compound is particularly beneficial in ensuring that the concrete achieves its desired strength and durability. By minimizing moisture loss, it assists in preventing issues related to surface scaling and spalling caused by freeze-thaw cycles or other environmental conditions. This treatment essentially enhances the longevity and serviceability of a concrete bridge deck. Other treatments, such as a sand coating, bitumen layer, or PVC membrane, focus on different aspects of protection and may not directly address the curing or moisture retention needs of freshly placed concrete as effectively as a white membrane curing compound.