21.8. Limitations and Challenges

Try these first

1. 1.

   What does workability refer to in concrete?

   Hint

   Think about how easy or difficult it is to work with concrete.

2. 2.

   Why is uniform fiber dispersion important?

   Hint

   Consider what happens if fibers are clumped together.

3. 3.

   What is one major limitation of fiber-reinforced concrete?

   • High workability
   • Reduced workability
   • No cost implications

   Hint

   Consider how fibers might impact mixing.

4. 4.

   True or False: Steel fibers in FRC are not susceptible to corrosion.

   • True
   • False

   Hint

   Think about what happens when steel is exposed to moisture.

5. 5.

   You are tasked with designing a fiber-reinforced concrete mix for a bridge in a marine environment. Discuss the key considerations you must account for regarding cost, materials, and durability.

   Hint

   Breakdown factors into categories: cost, fiber type, environmental concerns.

6. 6.

   How would you approach ensuring uniform fiber distribution in a large-scale concrete pouring project?

   Hint

   Think about mixing times and techniques that can improve evenness in the mixture.