Glass Fibre Reinforced Concrete (GFRC)

(GFRC) is a composite material consisting of a mortar of hydraulic cement and fine aggregate reinforced with Cem-Fll alkali resistant glass fibres. The GFRC may contain additional filler materials, pozzolanic materials and admixtures. The fibre contents are typically 3% to 5% by weight depending on product application and production method employed. The properties of GFRC depend on a wide range of variables.

These include method of manufacture. Mix formulation, fibre product type, length and orientation, admixtures used, etc. A GFRC material may therefore be tailored to meet the particular requirements of a specific application. The information given in this publication mainly refers to GFRC materials having an aggregate: cement ratio of up to 1:1. Incorporating Cem-Fll AR glass fibre and made by the spray and premix processes.

These GFRC materials have been widely used for many years and their properties and characteristics studied extensively. GFRC is a family of composite materials that combine the high compressive strength properties of cement mortars with significantly increased impact. flexural and tensile strengths imparted by the fibre reinforcement. GFRC products are safe, have good chemical resistance and will not rot or corrode.

GFRC is made of inorganic materials and will not burn, has negligible smoke emission and offers good fire resistance. In some circumstances GFRC is made containing polymer materials which may slightly affect some fire performance properties. GFRC is normally of relatively thin cross section, giving a low component weight which allows savings in handling, storage, transportation, and installation compared with traditional concrete products.

There are two main methods of manufacturing GFRC,

  • Spraying of fibre and slurry simultaneously onto a mold, by manual or mechanical means. Typical products made using the spray process include architectural cladding panels, channels, tanks, facade elements, ducting and permanent form work.
  • Premixing the fibre and slurry and then processing the mixture by vibration casting, extrusion, injection molding, etc... to produce the end product form. Typical products made using the premix process are sunscreens, planters, electrical transformer housings, slates and tiles, junction boxes and drainage components.