Red Seal Ironworker (Reinforcing) Practice Exam

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What is the function of epoxy coating on rebar?

To add to structural weight
To improve electrical conductivity
To enhance corrosion resistance
To increase flexural strength

The correct answer is: To enhance corrosion resistance

Epoxy coating on rebar serves the primary function of enhancing corrosion resistance. When used in concrete structures, reinforcing bars are susceptible to corrosion, especially in environments where moisture, salts, and other corrosive agents are present. The epoxy coating acts as a protective barrier that shields the steel from these corrosive substances, significantly extending the lifespan and durability of the rebar and, by extension, the concrete structure. This protective measure is especially crucial in environments like coastal areas or regions with de-icing salts, where regular steel rebar would deteriorate much faster. The use of epoxy-coated rebar helps ensure structural integrity over time and reduces the need for costly repairs and maintenance. The other choices provided do not accurately reflect the primary purpose of epoxy coatings for rebar. While structural weight, electrical conductivity, and flexural strength are important characteristics to consider in reinforced concrete design, they do not pertain to the direct benefit offered by applying an epoxy coating.