Concrete doesn't have to be heavier to be stronger.
If lightweight concrete is your goal, you're looking to leave metal reinforcement behind.
You want a product with comparable strength, but a low density.
At NYCON we offer any of our PVA fibers.These products have been tested to significantly increase compressive and flexural strength of a concrete mix with only a minimal increase in weight (1.3 Specific Gravity).
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RF4000 by Nycon are 130 denier, mono-filament macro PVA fibers (Polyvinyl Alcohol) for use in creating fiber-reinforced concrete (FRC). The primary benefits of RF4000 are light-weight flexural strength and increased impact and abrasion resistance. These PVA fibers bond on a molecular level (hydrogen bonding) within concrete, creating a multi-dimensional network of it's tensile strength (120 ksi (800 MPa) ).