GRC Manufacturing

Dependant on type of fibre and property requirements.

Glassfibre Reinforced Concrete (GRC), also known as Glass Fiber Reinforced Concrete (GFRC) is generally manufactured by either the "sprayed" process or the "premix" process

Premix GRC can either be vibration compacted, or manufactured using a self compacting GRC mix. The method chosen is normally dictated by factors such as strength requirements, size of mould, architects specification etc.

As a general rule, larger items, such as building cladding panels, are normally "sprayed" whereas small items are manufactured using a "premix" GRC method.

Sprayed GRC is generally stronger than premix vibration cast GRC. The reasons for this are firstly that with sprayed GRC it is possible to achieve a fibre content of 5% - 6% whereas premix GRC is limited to around 3% - 3.5%. Secondly, sprayed GRC usually has a lower water content than premix GRC.

If you would like any more information on GRC manufacturing please see our Manufacturing Types below, or get in touch today.

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Typical mix designs for Sprayed and Premix GRC materials are as follows:
Material Sprayed GRC Premix GRC

sand

50kg

50kg

cement

50kg

50kg

water

15 - 17 ltr

17 - 18 ltr

plasticiser

to manufacturers instructions

-

polymer

optional

optional

fibre

4 - 6% by weight

2 - 3.5% of weight

Dependant on type of fibre and property requirements.

The water/admixture/polymer content will need to be adjusted according to materials.

GRC Manufacturing Types

Glassfibre Reinforced Concrete (GRC), also known as Glass Fiber Reinforced Concrete (GFRC) is generally manufactured by either the "sprayed" process or the "premix" process. Premix GRC can either be vibration compacted, or manufactured using a self compacting GRC mix. The method chosen is normally dictated by factors such as strength requirements, size of mould, architects specification etc.

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