What is GRC?

GRC is one of applications of NEG ARG Fibre and means Glass fiber Reinforced Concrete. We are glass fiber manufacturer for GRC and do not produce any GRC.

Feature of GRC

GRC has great improved properties over those associated with conventional mortars and concretes. GRC products are widely used in construction and civil engineering.


Features of GRC

Light weight due to thin section
Design flexibility
Non-combustibility
Anti-corrosiveness
High bending strength
High impact strength



Typical properties of GRC

There are mainly two kinds of GRC classified by their process, one is Spray-up GRC, the other is Premix GRC. Typical properties of each GRC are shown in the Table below. All values shown in the Table are only for reference and not used for design. All GRC are not always satisfy the values because of various mix proportions and QC.

Process
Spray-up
Premix
ARG fiber content
(wt. %)
5
3
Density (air dried state)
(g/cm3)
1.8 -- 2.2
1.7 -- 2.1
Strength
Bending
MOR
(MPa)
20 -- 30
10 -- 20
LOP
(MPa)
7 -- 13
5 -- 10
Modulus of Elasticity
(GPa)
15 -- 25
13 -- 21
Tensile
UTS
(MPa)
10 -- 15
4 -- 7
BOP
(MPa)
5 -- 7
3 -- 5
Shear
Out-of-plane
(MPa)
20 -- 30
4 -- 6
In-Plane
(MPa)
7 -- 12
4 -- 6
Interlamainar
(MPa)
2 -- 4
4 -- 6
Charpy Impact Strength
N.mm/mm2
15 -- 25
7 -- 12
Water
Water Absorption
(%)
10 -- 15
10 -- 15
Drying Shrinkage
(%)
0.1 -- 0.2
0.1 -- 0.2
Heat
Thermal conductivity
(W/m.K)
0.9 -- 1.5
0.9 -- 1.5
Thermal Expansion Coefficient
(X10-6/oC)
7 -- 12
7 -- 12
Fire
Incombustibility
Incombustible material
Sound
Transmission Loss (dB)
(Thickness: 15 mm)
125 Hz
27
250 Hz
30
500 Hz
35
1000 Hz
39
2000 Hz
40

MOR
:
Modulus Of Rupture
LOP
:
Limit Of Proportionality
UTS : Ultimate Tensile Strength
BOP
: Bend-Over Point


Process of GRC

[ Spray Process ]
Spray-up GRC is produced by using spray gun which sprays mortar fed from a "mortar" pump and "glass fibers" cut in the spray gun from Roving. And then , sprayed GRC is compacted by roller.
Sprayed GRC required spray gun, Mixer, mortar pump and air compressor. Out-line of the process is as follows. We link to UK spray equipment manufacture -- Power-Sprays Ltd.






[ Premix process ]
Premix GRC is produced by using just a mixer where mortar (cement, sand and water) and Chopped Strands are mixed. Mixed GRC mortar is cast into mold and then vibrated or pressed.

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