FRP-Rebar Manufacturers Council
2681 N.E. 4th AVE
POMPANO BEACH, FL 33064
ph: 954-803-9206
alt: 954-270-9000
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The physical strength of RockRebar® rods from 4 mm to 25 mm diameters rods change as the diameter goes up, with smaller diameter rods generally having higher tensile strength. Typical examples are shown below.
Accelerated aging in alkaline solution
The fibers analyzed are basalt, E-glass, boron free E-glass and AR-glass.
The samples tested were unidirectional fabrics having the same surface density of (300 g/m2).
The standard test method used for the accelerated aging testing alkaline solution is the one described in
After conditioning, specimens are well rinsed in distilled water and dried for 7 days in the same controlled laboratory conditions.
The specimen’s weight was measured both before and after the aging in order to evaluate fibers weight loss.
E-glass 12 samples average value 3.87 % St. Dev. 0.57 |
Boron-free-E-glass 12 samples average value 3.00 % St. Dev. 0.94 |
AR-glass 6 samples average value 2.01 % St. Dev. 0.32 |
Basalt fiber 12 samples avarage value 1.04 % St. Dev. 0.44 |
Basalt fiber stability after 3 hour boiling H2O is 1.6% |
Basalt fiber stability after 3 hour boiling 2N NaOH is 2.8% |
Basalt fiber stability after 3 hour boiling 2N HCI is 2.2% |
It is interesting to underline that E-glass fibers presented the greatest weight loss, of 3.87% (as average value), while basalt fibers presented the lowest one loosing only 1.04% of it`s volume after 28 days in pH=14 sodium hydroxide aqueous solution.
RockRebar® Nominal Diameter in inch, mm and # | Coil weight 200 meters = 650 feet | Weight per 39'6" length = (12 meters) lbs. 200 meter coil | Shear Strength Mpa & ksi | Guaranteed design tensile strength ASTM Mpa & ksi | Stiffness GPa & ksi |
0.170= 4mm | 21.5 lb / 9.75 kg | 1.2 lbs / 0.54kg | N/A | 1059 153 | 92 13,334 |
0.25 = 6mm = #1 | 33.5 lb/ 15.2 kg | 2.1 lbs / 0.953 kg | N/A | 1015 147 | 89 12,908 |
.315 = 8mm = #2 | 52.5 lbs 23.8 kg | 3.25 lb /1.474 kg | 201 29 | 920 133 | 87 12,618 |
.393 = 10mm = #3 | 86 lbs / 39 kg | 4.85 lbs / 2.2 kg | 208 30 | 890 129 | 86 12,473 |
0.472 = 12mm =#4 | 143 lbs/ 64.8 kg | 9.47 lbs / 4.3 kg | 219 31 | 868 126 | 85 12,328 |
0.63 = 16mm = #5 | N/A | 18.37 lbs/ 8.33 kg | 225 32 | 790 115 | 82 11,893 |
Notes on comparisons:
Concrete(10.15 x 10¯⁶/°C ) (5.7 x 10¯⁶/°F )
RockRebar® (6.2 x 10¯⁶/°C ) (Lenght Wisex 3.5x10¯⁶/°F )
Steel (11.5 x 10¯⁶/°C ) (6.35 x 10¯⁶/°F ) yield strain of 60 series= 0.020
Notice RockRebar® always has slightly less thermal expansion than concrete. Steel always has more allowing micro cracks and moisture intrusion
density of concrete is about 2.5g/cm3 RockStaples are 2.8g/3cm3 so they mix and stay mixed very well
No measurable creep if sustained load is less than 40% of tensile rating
alkaline PH13 |
Strain at break 0.0315 in 2.8 g/c
Water absorption 72 hours @ 65 C is 0.02%
Thermal heat transfer W/m degrees C 0.031- 0.034 Glass temperature @ formation of fiber 2650F 1454C ______________________________________ RockRebar® Dimensional Stability at 200 C 392F 96% density of is 1.9 (g/cm?) Glass transition temperature of our preparatory epoxy adhesive matrix in production is 475F=(246°C)
Coefficient Thermal Expansion (Lenght Wise 3.5 x 10¯⁶/°F ) (Across RockRebar 13.2 x 10¯⁶/°F) (Lenght Wise 6.2 x 10⁶/°C ) (Across RockRebar 23.8 x 10¯⁶/°C)
Thermal conductivityW/m degrees C 0.036
Average strain at rupture for 1/2" (#4) in./in.(0.019)
Compressive strength more than = 500 MPa 72,520 PSI
Nominal Bond strength MPa = 19.8 Nominal Bond Strength PSI = 2872 Minimum embedded lengths should be not less than 20db ( diameters of the rebar)
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SiO2 51.80 Al2O3 15.50 Fe2O3 10.30 MgO 7.13 CaO 8.59 Na2O 3.34 K2O 1.46 TiO2 1.38 P2O5 0.28 MnO 0.16 Cr2O3 0.06
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Field Handling Considerations
1. 1.Unrolling RockRebar® coils. Substantial kinetic energy is stored during the coiling process.Care must be exercised when uncoiling to prevent tangling and uncontrolled movement of ends. Coils are shipped with U clamps to allow uncoiling from the inside of the coil for safety reasons.
2..Cutting in the field. Bolt cutters are not recommended because they dull quickly and break themselves resulting in shattered steel. Cable cutters do work well on sizes 12 mm and smaller, however frequent sharpening is required. Hacksaws or abrasive wheels will work.The best choice is an inexpensive, 4” battery circular saw with common inexpensive diamond tile blade. They last a long time for the money. Bulk cuts may be done with chop saw, or gas saw with a masonry blade, but wet saw is preferred.
Copyright 2013 RAW MATERIALS CORP. All rights reserved.
2681 N.E. 4th AVE
POMPANO BEACH, FL 33064
ph: 954-803-9206
alt: 954-270-9000
bill