What are the Properties of GRC?

The properties of Glass fibre Reinforced Concrete (GRC) vary according to the production method, mix design, and the type and content of the alkali resistant Glass fibre.

Traditional Spray can produce the highest strengths due to a high AR Glass fibre content, low water/cement ratio, long fibre length and planar fibre orientation.

Premix Strengths are generally lower than those of the Traditional Spray method due to lower AR Glass fibre reinforcement contents, higher water/cement ratios, shorter fibre lengths and 3-dimensional fibre orientation.

Sprayed Premix gives consistent mechanical properties similar or higher than those obtained with vibration cast premix.

Typical Mechanical Properties
Property
Units
Hand Spray
Premix
Fibre Content
Wt.%
4 - 5
1.5 - 3.5
Density (dry)
g/cm³
1.8 - 2.1
1.8 - 2.1
Flexural Strength      LOP
N/mm²
6 - 10
5 - 10
Flexural Strength      MOR
N/mm²
18 - 30
5 - 15
Compressive Strength
N/mm²
40 - 70
50 - 80
Tensile Strength       UTS
N/mm²
8 - 12
3 - 6
Tensile Strength       BOP
N/mm²
4 - 6
3 - 5
Thermal Conductivity
w/m°C
0.9 - 1.5
0.9 - 1.5
Thermal Expansion Coefficient
x10-6/°C
7 - 12
7 - 12

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