Technical Characteristics

GFRP Rebar

Characteristics of glass fiber

· Resistant to high temperatures and does not burn
· No absorption or low hygroscopicity
· The elongation rate is small,
but the tensile strength is strong
· High electrical insulation

FRP

· Lightweight and excellent formability
· Excellent chemical corrosion resistance

Rolled rebar

· Construction materials that overcome the disadvantages of steel rebar

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

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

▶ Linear stress-strain operation

Minimum cover thickness of GFRP reinforcement

▶ Reduction in coating thickness compared to rebar due to corrosion resistance

Design of GFRP member

▶ Stress distribution is approximated with a rectangular equivalent stress block used for cross-section analysis of reinforced concrete

Strength reduction factor
according to reinforcement
ratio

▶ Application of strength
reduction factor in bending
design reflecting failure mode