Glass fiber reinforced concrete
RIMSA's glass fibers for concrete are alkali-resistant (AR) glass macrofibers added to the mix as non-metallic reinforcement. They provide crack control and improved toughness with no risk of corrosion or surface staining, which makes them especially suitable for precast elements, façade elements and repair mortars, where the exposed finish is decisive.
Types of glass fibers for concrete we offer
Steel fibers for concrete
The highest structural capacity. The choice when the aim is to replace conventional reinforcement in floors, slabs, tunnels and precast elements.
r glued · r wave eco · r hook · r glued HT · r smart
Polymer fibers for concrete
Microfibers against plastic shrinkage cracking and macrofibers with residual strength, with lower weight and no risk of corrosion.
r grip · r twist · r gun
Frequently asked questions about glass fiber reinforced concrete
What are glass fibers for concrete?
They are alkali-resistant (AR) glass filaments added to the mix as non-metallic reinforcement. They provide crack control and improved toughness with no risk of corrosion or surface staining, which makes them especially suitable when the exposed finish is decisive. This use —fiber dosed into the mix— should be distinguished from GRC or GFRC, a thin-layer sprayed or premixed composite for architectural panels.
Why do they have to be alkali-resistant?
Because concrete is a strongly alkaline medium that degrades ordinary glass over time, with the consequent loss of performance. AR fibers contain zirconium oxide, which gives them chemical stability in that environment and ensures the reinforcement remains effective throughout the service life of the element. Using non-AR glass fiber in concrete is not a cheaper alternative: it is a durability mistake.
Which applications are glass fibers used in?
Mainly in precast and façade elements, repair mortars and renders, and generally wherever reinforcement with a clean surface finish, no rust spots and low weight is sought. Also in parts with complex geometries or thin sections, where placing conventional reinforcement is not feasible.
Can they be combined with other fiber types?
Yes. Hybrid solutions are common when two needs have to be covered at once, for example early crack control and structural capacity, or mechanical performance with a careful surface finish. The combination must be justified by the intended behaviour and validated by testing, as the interaction between fiber types is not simply the sum of their separate effects.