Technical Information

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The typical formulation of GRC

Spray Premix
Cement 50 kg 50 kg
Fine aggregate 50 kg 50 kg
Glass fibre 4.5-5% 2-3.5%
Plasticiser 0.5 kg 0.5 kg
Polymer 5 kg 5 kg
Water 13.5 litre 14.5 litre
The specification of GRCUnlike traditional concrete, which is classified by its compressive strength, GRC is classified by its flexural strength or Modulus of Rupture (MOR). GRC is categorised into three grades, Grade 8, Grade 10 and Grade 18, with each grade identified by its corresponding MOR value.Over the last 50 years, GRC best practice standards have been developed and applied across Europe, America, Asia and Australasia that set the benchmark for producing high quality GRC. For more detailed information about the production standards for GRC products, refer to the International Glass Reinforced Concrete Association, “Specification for the manufacture, curing and testing of GRC products, Third Edition – March 2010” .

The typical strength properties of GRC at 28 days after manufacture

Spray Premix
Ultimate strength (MOR) MPa 20-30 10-14
Elastic limit (LO R) MPa 7-11 5-8
Interlaminar strength MPa 3-5 NA
In-planar strength MPa 8-11 4-7
Compressive strength MPa 50-80 40-60
Impact strength Kj/m2 10-25 10-15
Elastic modulus GPa 10-20 10-10
Strain to failure % 0.6-1.2 0.1-0.2
Dry density t/m3 1.9-2.1 1.8-2.0
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