Concrete that spans a distance will be under flexural stress, in which you are depending on only a small part of your concrete to handle a significant part of your load.
Concrete that flexes more, fails less.
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Flexural Strength Products
RECS15 by Nycon are 8 denier, ductile mono-filament PVA fibers (Polyvinyl Alcohol) for use in creating fiber-reinforced concrete (FRC). The primary benefits of RECS15 are an increase in the flexibility and toughness of concrete. These fibers lend their 5700 ksi (40 GPa) of flexural strength to your concrete allowing it to bend where normal concrete would break. RECS15 is graphite-coated to aid in dispersion and increase strain hardening. These PVA fibers bond on a molecular level (hydrogen bonding) within concrete, creating a multi-dimensional network of tensile (240 ksi (1600 MPa) ) and flexural strength.