GFRP Rebar
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Excellent specific strength
※ Specific Strength : Strength to weight
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Material Types | Tensile strength (MPa) |
Density (g/㎤) |
Specific strength (kN·m,/kg) |
---|---|---|---|
Low Carbon Steel (AISI 1010) | 365 | 7.87 | 46.4 |
Stainless steel (304) | 505 | 8 | 63.1 |
Nylon | 78 | 1.13 | 69 |
Aluminium alloy (7075-T6) | 572 | 2.81 | 204 |
Titanium alloy (Beta C) | 1250 | 4.81 | 260 |
Carbon-epoxy composite | 1240 | 1.58 | 785 |
Glass fiber | 3400 | 2.6 | 1307 |
Basalt fiber | 4840 | 2.7 | 1790 |
Carbon fiber (AS4) | 4300 | 1.75 | 2457 |
Kevlar | 3620 | 1.44 | 2514 |
▶ About 1/4 the weight of steel rebar
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Temperature expansion and temperature transition
※ Similar coefficient of thermal expansion to concrete
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Direction | Temperature expansion coefficient (x10-6/℃) | ||||
---|---|---|---|---|---|
Steel | GFRP (Glass) | CFRP (Carbon) | AFRP (Alamid) | Concrete | |
Longitudinal direction | 11.7 | 6.0~10.0 | -9.0~0.0 | -6.0~-2.0 | 7.2~10.8 |
▶ Excellent compared to steel rebar
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Steel | GFRP | |
---|---|---|
Thermal conductivity | 46 W/mk | 0.35 W/mk |
Modulus of elasticity | 200 GPa | 50 GPa |
▶ Excellent insulation performance with low thermal conductivity
Mechanical properties
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▶ Linear stress-strain operation
Minimum cover thickness of GFRP reinforcement
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▶ Reduction in coating thickness compared to rebar due to corrosion resistance
Design of GFRP member
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▶ Stress distribution is approximated with a rectangular equivalent stress block used for cross-section analysis of reinforced concrete
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Strength reduction factor
according to reinforcement
ratio
▶ Application of strength
reduction factor in bending
design reflecting failure mode