General Contractor Practice Exam

For what purpose is glass fiber considered the best choice in construction?

1. Insulation material

2. Ducts in the placement of concrete

3. Structural support

4. Waterproofing

The correct answer is: Ducts in the placement of concrete

Glass fiber is highly regarded in construction, particularly for its role in improving the performance of concrete and enhancing its properties. When used as a reinforcement material, glass fiber provides several benefits such as increased strength, durability, and resistance to cracking. The addition of glass fiber in concrete mixtures helps to create a composite material that performs better under tension and can withstand various environmental stresses. Using glass fibers in concrete is especially advantageous in applications where weight reduction and improved load-bearing capabilities are crucial. Unlike traditional steel reinforcements, glass fiber does not corrode, making it suitable for use in environments where moisture and chemicals may cause degradation over time. This quality leads to longer-lasting and low-maintenance structures. In the other choices, insulation materials are typically made from materials like fiberglass or foam, offering thermal resistance rather than structural enhancement. Structural support usually relies on metals or wood for their high strength and ductility. Waterproofing involves materials designed specifically to block water penetration, like membranes or coatings, which serve a different purpose than what glass fiber provides. Thus, glass fiber solidly aligns with its application in the placement and enhancement of concrete.