Red Seal Ironworker (Reinforcing) Practice Exam

What is the role of reinforcing wire mesh in concrete?

1. To reduce the overall weight of the concrete

2. To provide tensile strength and distribute stresses across the slab

3. To improve the setting time of concrete

4. To enhance heat resistance in concrete structures

The correct answer is: To provide tensile strength and distribute stresses across the slab

The role of reinforcing wire mesh in concrete is primarily to provide tensile strength and distribute stresses across the slab. Concrete is strong in compression but weak in tension, meaning that while it can withstand heavy loads pushing down on it, it can crack under tension or pulling forces. The inclusion of wire mesh, which consists of a grid of steel wires, enhances the tensile strength of the concrete. When concrete is poured, the mesh is embedded within it, helping to distribute any stresses that occur due to loads placed on the slab. This redistribution helps prevent cracking and improves the overall durability of the concrete structure. By reinforcing the concrete in this manner, the mesh allows for weight to be supported more evenly and extends the lifespan of the concrete. The other options do not accurately describe the primary function of wire mesh. While it does not reduce the weight of concrete, improve setting times, or enhance heat resistance, its significant contribution lies in reinforcing tensile strength and stress distribution.