WHAT IS GLASS FIBER REINFORCED CONCRETE?

INTRODUCTION

Glass fiber reinforced concrete or GFRC is a one type of fiber-reinforced concrete. The product is also known as Glass fiber reinforced concrete or GRC. Glass fiber concretes are mainly used in exterior building fa├žade panels and as architectural precast concrete. GFRC is also used extensively for decorative panels. GFRC is used in both structural and ornamental applications. Because GFRC is often mixed with less water than traditional concrete, alongside a heavy addition of AR glass fibers and acrylic polymer, GFRC is significantly stronger and more flexible than traditional alternatives. Overall, GFRC is a lightweight, flexible, stronger alternative to traditional concrete.

China Glass Fiber Reinforced Concrete Chopped Stand - China ...


Composition of GFRC
  • Cement: Generally Portland cement is used.
  • Aggregates: Fine aggregates are used in general in the making of GFRC.
  • Glass fibres: Continuous filament and alkali resistant fibres are preferred.
  • Polymers: Acrylic polymers are preferred.


Procedure
  • Glass fibers of 10mm to 50mm in length and a few microns in diameter can be added up to 5% by weight and premixed with cement and water in a pan or a paddle mixer. 
  • Small quantities of lubricating admixtures, such as polyethylene oxide or methyl cellulose may be added into the mix. The resulting mix may be sprayed or cast into the moulds.
  • The products can also be produced either by extrusion or by injection-moulded process. In some of the processes, rovings can be chopped in-situ and sprayed simultaneously with a slurry of suitable consistency on a mould of production. 

Advantages of GFRC 


  • GFRC is significantly more environmentally friendly than traditional concrete, making use of recycled materials and requiring less cement.
  • GFRC is internally reinforced, and doesn’t require extra reinforcement.
  • GFRC has been tested in the laboratory and also in the actual installations, and can be anticipated to survive as long as pre-cast concrete. In numerous environmental conditions, like when exposed to salts or moisture, GFRC is likely to function better due to the absence of steel reinforcement that may corrode.
  • Relatively light in weight compared to the traditional stones. Its installation is fast and comparatively simple.
  • GFRC has the characteristics to be cast into almost any shape.
  • GFRC is naturally flame-resistant, and can act as a thermal regulator, protecting materials around it from heat.
  • GFRC is thin and strong, with weight being 75% to 90% less compared to solid concrete. Less weight facilitates easy and rapid installation, and also decreases the load applied on the structure. The light weight and tough material also minimizes the transportation expenditures, permits flexibility in design, and reduces the impact on environment.
  • Superior strength enhances the ability to endure seismic loads.
  • GFRC is less vulnerable to weather effects and more resistant to freeze thaw than the normal concrete.


Disadvantages
  • Still it is costlier then other materials available in market.
  • The GFRC is known to lose its strength over long period of time.
  • A lot of forward planning is required when using GFRC as it made pre-cast in comparison to on-site.
  • Cracks are seem on joint of sheets on prolong time.

Applications of Glass Fibre Reinforced Concrete

The glass fibre reinforced concrete usually finds applications in following construction works:
  • Building renovation works
  • Water and drainage works
  • Bridge and tunnel lining panels
  • Permanent formwork method of construction
  • Architectural cladding
  • Acoustic barriers and screens

Characteristics of GFRC

  • Strength of GFRC is developed due to high contents of alkali resistant glass fibers and acrylic polymer. 
  • Since the cement contents are high, and the ratio of water to cement is low, the GFRC strength under compressive loads is high. 
  • GFRC also possesses great tensile and flexural strength. 
  • The fiber orientation determines the effectiveness of fiber resistance to loads. 
  • The fiber must be stiff to ensure the provision of required tensile strength. Thus, the performance of these materials is better than the normal concrete. 
  • The high fiber content bears the tensile loads, while the concrete is flexible due to the polymers.



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