GFRC/UHPC (Ultra high performance concrete) is similar to chopped fiberglass (the kind used to form boat hulls and other complex three-dimensional shapes), although much weaker. It’s made by combining a mixture of fine sand, cement, polymer (usually an acrylic polymer), water, other admixtures and alkali-resistant (AR) glass fibers. Some of the many benefits of GFRC include:
Ability to Construct Lightweight elements- Although the relative density is similar to concrete, GFRC/UHPC can be much thinner than traditional concrete , making the constructions lighter.
High Compressive, Flexural and Tensile Strength- The high dose of glass fibers leads to high tensile strength while the high polymer content makes the concrete flexible and resistant to cracking. Proper reinforcing using scrim will further increase the strength of objects and is critical in projects where visible cracks are not tolerable.
Compressive strength / Bending strength
After 1 day 60 MPa / 6 MPa
After 7 days 90 MPa / 7 MPa
After 28 days >100 MPa / >9 MPa
The glass fibers used in GFRC/UHPC help give this unique compound its strength. Alkali resistant fibers act as the principle tensile load carrying member while the polymer and concrete matrix binds the fibers together and helps transfer loads from one fiber to another. Without fibers GFRC/UHPC would not possess its strength and would be more prone to breakage and cracking.