Reinforced Polymer (FRP) Rebar
ACTUAL PHOTO OF OUR FIBERGLASS
(SUBMITTAL SHEET LOCATED AT BOTTOM OF PAGE)
IS NO QUARTZ SAND COATING)
a structural spiral wrapped fiberglass reinforcing rod which is corrosion
resistant, non-conductive and lightweight while it is one-fourth the
weight of steel rebar.
It more closely matches the characteristics
of wood for modulus of elasticity, expansion and contraction, and
condensation than does typical steel reinforcing rod.
The Modulus of Elasticity of FRP rebar from
the test results is 7.86 x 10 psi, that of steel 30 x 10 psi. In other
words, for the same shape and same load, FRP will deflect, elongate, or
compress approximately five times as much as steel.
making load bearing connections, pinning and reinforcing wood and concrete
elements. Typical applications include attachment and reinforcement
of rafters, trusses, purlins, framing members, beams, sills, columns,
logs, timbers, etc.
It can be used for casting wood and concrete
elements and to replace steel rebar in concrete slabs, forms and beams.
Fiberglass rebar is most often used in conjunction with Epoxy
Adhesive for attaching the rebar to the elements and the
elements to one another.
What is the
composition of the FRP rebar?
material is a composite of cross-linking polymer resin matrix reinforced
by continuous glass filaments in a Reinforcement to Matrix Ratio of 70/30
percent by weight.
roving is drawn into a tank of thermosetting plastic resin where
saturation takes place.
The roving is then drawn through an orifice equal in diameter to the
glass-to-resin ratio of 70/30.
A spiral winding is applied and the material is cured continuously,
producing a void-free, corrosion-resistant matrix that bonds and protects
the glass fibers.
E Rebar = 30% lsophthalic Resin Calcium Carbonate
Series E Rebar = 70% 113 Yield Fiberglass Roving
Does the FRP Rebar
have a fire rating?
have a resin rated at 500°F Heat Distortion Temperature.
We think the rebar will show very little loss in physicals up to 700° F. to 800° F.
is the E value of the FRP rebar?
the University of Arkansas Test result: 7.86 x 106 psi
does the Modulus of Elasticity affect design planning?
high Ultimate Strength to a low Modulus of Elasticity (E) Ratio,
deflection is the limiting design factor.
Deflection is a function of
Modulus of Elasticity, all other factors being equal (i.e. shape).
the Modulus of Elasticity change with different sizes?
is an inherent physical property of the material.
is the mode of failure?
does not yield. Yield strength and ultimate strength are the same point.
Glass is a brittle, not a ductile material.
does the flexibility (low Modulus of
Elasticity), affect design?
designer deals with deflection by using more FRP reinforcement than he
would in designing for steel, i.e., more or larger bars; or by using
deeper beams, etc.
form is the Stress/Strain curve?
Stress/Strain curve is a straight line to failure, at a slope equal to E,
up to Ultimate Strength of approximately 150,000 psi (approximately 4
times ASTM Grade 40 steel)
is the Fatigue and Stress/Strain Relationship?
University of Arkansas test report was based on several hundred tests for
which stress/strain curves were plotted. We know that FRP does not fatigue
when stressed to no more than 1/2 of its ultimate strength. It does not
yield as do other materials such as steel. Ultimate strength and yield
strength are the same. It would be extremely unlikely that FRP rebar would
be designed to working load of more than 1/4 of Ultimate Strength
(approximately 160,000 psi).
is the Ultimate Strength for different sizes of Rebar?
Strength" refers to per unit values. It is a physical property of the
material itself that applies to all sizes and shapes into which the
material may be formed. Tests indicate that the Ultimate Strength of the
FRP rebar is approximately 160,000 psi maximum. The "breaking
strength" of various sizes of rebar can vary in inverse relation to
bar size - from 160,000 psi for smaller sizes, to 100,000 psi for larger
do you use FRP rebar in beam and slab design?
designer is simply using a material with different physical properties. As
a result of the difference in the physical properties (in this case a
lower value of E), he will arrive at different amounts of reinforcements,
beam sizes, column dimensions, etc. than if he were designing in other
do you tie the bars together?
ties of plastics clips.
the FRP rebar be bent by the customer?
Resins are cross-linking thermo-sets.
Cure is a chemical reaction, not a
change of physical state.
All ACI bends are available by manufacturer.
is the life span of FRP rebar?
FRP rebar has been in use for over 20 years, without any evidence of
Life expectancy of the FRP rebar is - forever!
are the most efficient ways to cut FRP rebar?
hack saw, brick saw, or diamond chip saw.
there any special storing requirements?
FRP rebar will not rust. It is non-corrosive and is unaffected by
Storage of FRP rebar prior to placement will no cause deterioration.
well does FRP rebar bond with concrete?
FRP rebar is a deformed bar. Bonding is comparable to steel.
Ultimate Tensile Strength:
psi (About Three Times Steel)
Tensile Modulus: 7.86 X 106 psi Average
Coefficient of Thermal Expansion: 5.5 X l0-6 in/in°F
Lbs./1n3 (About 1/4th That of Steel)
drawn glass roving saturated with vinyl ester resin.
strand, spiral wrapped around the exterior diameter to provide a spiral
indentation in the bar providing maximum bonding and lock to epoxy,
concrete or grout bedding.