WHAT ARE MACRO-SYNTHETIC FIBERS?
Synthetic macro-fibers have a lower E-modulus than steel fibers (5–15 GPa). Unlike steel fibers, synthetic macro-fibers cannot take extremely high loads, but they work extremely effectively in the early phases of hardening to prevent and/or reduce the size of cracks developing in the concrete. They are corrosion resistant and give the concrete greater ductility. Synthetic fibers have more fibers per kg to balance the high e-modulus of steel fibers.