Comparison with Steel Fibers:
In terms of technical properties, macrofibers and steel fibers are very different. The way the fibers behave after cracking also differs greatly.
The main difference is that compared to steel fibers, the elastic modulus of macrofibers is approximately 40 times smaller.
Compared to concrete, the elastic modulus of macrofibers is approximately 5 times smaller, which means it is very difficult to prevent cracking with macrofibers.
Steel fibers start working immediately after microcracking, the maximum effect of macrofibers occurs when cracks open in the range of 1.5…3mm.
Macropolymer Fibers vs Steel Fibers:
Comparison of Fiber Reinforced Concrete (FRC) or Fiber-Reinforced Composite Material.