Attestation of conformity
Discover the specifications of GFRP rebar
The performance and features like durability, light weight and corrosion resistance of composite rebar is one of the the strengths of GFRP rebar and adds to it’s popularity among builders and professionals. However, many people, who are used to work with conventional metal steel bars are often skeptical about the fact that the GFRP rebar can replace conventional steel rebar.
These fears arise because of a lack of information about the capabilities and characteristics of the composite materials.
To fill this gap of knowledge below please find a description of the most important construction parameters comparing steel versus GFRP rebar:
properties*
steel rebar
stainless steel rebar
GFRP
ultimate tensile strength ftk (N/mm²)
550
550
< 760
characteristic value tensile strength fyk (N/mm²)
500
500
no yielding
strain at Ultimate Limit State
2.18 ‰
2.72 ‰
7.4 ‰
tension modulus of strength GPa
200
200
36,3
design value bond strength fbd ≤ C40/50
acc. EC 2
acc. EC 2
acc. EC 2
design value bond strength fbd > C40/50
acc. EC 2
acc. EC 2
3.7
concrete cover (min.)
acc. EC 2
ds + 10 mm
ds + 10 mm
density g (g/cm³)
7.85
7.85
2.2
thermal conductivity (W/mK)
60
15
< 0.5
coefficient of thermal expansion (1/K)
0.8 – 1.2 x 10-5
0.8 – 1.6 x 10-5
0.6 x 10-5 (axial) 2.2 x 10-5 (radial)
specific resistance (μΩcm)
1 – 2 x 10-5
7.2 x 10-5
> 1012
magnetism
yes
yes
no
Considering that GFRP has superior strength compared to steel rebar does that under normal circumstances smaller diameter GFRP rebar can replace larger diameter steel rebar – it is naturally important that the replacements are being confirmed by an engineer prior to application, however normally the replacing steel rebar with GFRP rebar can be done as per below diagram:
1
NOMINAL DIAMETER OF GFRP BARS
EQUIVALENT DIAMETER FOR STEEL BARS (A400)
PACKAGING
Meters in 1 ton of GFRP rebar
Meters in 1 ton Steel rebar
WEIGHT OF 1 METER OF GFRP REBAR (KG)
WEIGHT OF 1 METER OF STEEL REBAR (KG)
6
8
100m
25 000.000
2,531.646
0.040
0.395
7
10
100 m
16 666.667
1,620.746
0.060
0.617
8
12
100 m
12 500.000
1,126.126
0.080
0.888
10
14
50 m
10 000.000
826.446
0.100
1.210
12
16
50 m
5 555.556
633.312
0.180
1.579
13
18
Up to 12 m
4 761.905
500.000
0.210
2.000
14
20
Up to 12 m
4 166.667
405.351
0.240
2.467
16
24
Up to 12 m
3 030.303
259.403
0.330
3.855
18
28
Up to 12 m
2 702.703
207.039
0.370
4.830
24
32
Up to 12 m
2 040.816
158.328
0.490
6.316
30
40
Up to 12 m
1 666.667
101.338
0.600
9.868
Our GFRP rebar is produced according to the following specifications and guidelines:
American Association of State Highway & Transportation Officials (AASHTO)
AASHTO GFRP-1: AASHTO LRFD Bridge Design Guide Specifications for GFRP- Reinforced Concrete Bridge Decks and Traffic Railing
American Concrete Institute (ACI)
440.1R-06: Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars
440.5-08: Specification for Construction with Fiber-Reinforced Polymer Reinforcing Bars
440.6-08: Specification for Carbon and Glass Fiber-Reinforced Polymer Bar Materials for Concrete Reinforcement
440.3R-12: Guide Test Methods for Fiber-Reinforced Polymer (FRP) Composites for Reinforcing or Strengthening Concrete Masonry Structures
440.2R-08: Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures
440.7R-10: Guide for the Design and Construction of Externally Bonded Fiber-Reinforced Polymer Systems for Strengthening Unreinforced Masonry Structures
CANADIAN STANDARD ASSOCIATION (CSA)
CANCSA-A23.3-04-Calculdes onrages en beton. edition 2004 (confirm ecn 2010, Norms CSA, Canada, 632 p
CANCSA-Sб-06-Code canadien sur lecalcul des ponts routiers, edition 2006. Norms CSA. Canada, 820 p
CANCM-S6-66-Design of Bridges, edition 966 Nomсs Canada, 170p
CAN CSA-S806-02-Regles de calculet de ants de pol meres renforces defibres. edition 2002 (confirme en construction des compos 2007) Normes CSA. Canada, 212 p
Caves-S806-12-Specifi for the-reinforced bars polymers, edition 2010. Norms CSA, Canada, 44 p.
CANCSA-S807-10-Design and construction of building structures with fibers-reinforced polymers. edition 2012. Norms CSA, Canada 187 p
Below you can see a sample of the test report which is made by the laboratory when the laboratory tests one of our productions of GFRP.
ESSAIS DE TRACTION
ARMATURE GFRP | Résistance à la traction valeur mesurée
(Mpa)
| Résistance á la traction minimale garantie
(Mpa) | Module d’élasticité á la traction valeur mesurée (Gpa) | Module d’élasticité nominal á la traction
(Gpa) | Déformation de traction Ultime (%)
Ø 1,2 |
Essai 1 Essai 2 Essai 3 Essai 4 Essai 5 | 1156,8 1158,3 1125,4 1193,8 1249 |
| 59,53 56,82 61,05 56,57 61,59 |
|
|
MOYENNE | 1176,6 | 760 | 59,11 | 39,3 | 1,7 |
TESTS D’ABSORPTION D’HUMIDITÉ
ARMATURE GFRP | Poids Initial (g) | Poids Final (g) | Absorption (%) |
Essai 1 Essai 2 Essai 3 Essai 4 Essai 5 | 30 30 30 30 30
| 30 30,01 30 30 30 | 0 0,03 0 0 0 |
MOYENNE |
|
| 0,006 |
*Conforme aux exigences de la Norme ACI 440.6M-08
* conformément aux exigences du règlement particulier de la certification de conformité aux normes ASN/RP 012
