Precast Consulting Service
Finance, Marketing &
Channel Slab with Fiberglass
Test at 260 PSF (safety factor of 4)
Deflection is substantially less than L/360
at the design load (the spec.)
Impermeable microsilica mix design (fc = 10K)
Fiberglass rebar [GFRP]
To combat corrosion, we used fiberglass or
stainless rebar in about half our installations.
We provided about 3 million SF of roof planks
reinforced with fiberglass rebar. This was by far the most significant
use of FRP rebar in a tension sensitive application.
The tensile strength of fiberglass rebar is
typically above 100K
The modulus of elasticity however is typically
about 6,000K - about a fifth of steel.
To achieve flexural values, the design in
a tension sensitive application required larger bar than required for the
load, so that the product would be sufficiently stiff. Modulus of
elasticity is often the limiting design parameter with FRP bar, even in
carbon fiber [CFRP]. That is the reason for this publicity photo.
Here is a nice article on this subject area
in Composite Technology. click
for the Precast Industry