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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.
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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