21.4.1. Stress-Strain Behavior

Try these first

1. 1.

   What is the primary difference between the stress-strain behavior of plain concrete and fiber-reinforced concrete?

   Hint

   Think about how each type behaves after reaching the peak load.

2. 2.

   What are the two types of post-cracking behavior in FRC?

   Hint

   One allows load to increase, while the other allows it to decrease.

3. 3.

   What characterizes the stress-strain behavior of fiber-reinforced concrete?

   • Linear until failure
   • Non-linear strain hardening
   • Constant under load

   Hint

   Think about how fibers influence the behavior after cracking.

4. 4.

   True or False: Deflection hardening indicates that load decreases post-cracking.

   • True
   • False

   Hint

   Recall the characteristics of deflection hardening.

5. 5.

   Design a fiber-reinforced concrete mix with optimal fiber volume to maximize strength without compromising workability. Discuss the parameters involved.

   Hint

   Think about both the mechanical properties and processability.

6. 6.

   Given a load-deflection curve from an experiment, identify the maximum load capacity and define the implications for structural design.

   Hint

   Identify peak points in the load-deflection plot for guidance.