6.9—Curing of resins
Curing of resins is a time-temperature-dependent
phenomenon. Ambient-cure resins can take several days to
reach full cure. Temperature extremes or fluctuations can
retard or accelerate the resin curing time. The FRP system
manufacturer may offer several prequalified grades of resin to
accommodate these situations.
Elevated cure systems require the resin to be heated to a
specific temperature for a specified period of time. Various
combinations of time and temperature within a defined
envelope should provide full cure of the system.
All resins should be cured according to the manufacturer’s
recommendation. Field modification of resin chemistry
should not be permitted.
Cure of installed plies should be monitored before placing
subsequent plies. Installation of successive layers should be
halted if there is a curing anomaly.
6.10—Temporary protection
Adverse temperatures; direct contact by rain, dust, or dirt;
excessive sunlight; high humidity; or vandalism can damage
an FRP system during installation and cause improper cure
of the resins. Temporary protection, such as tents and plastic
screens, may be required during installation and until the
resins have cured. If temporary shoring is required, the FRP
system should be fully cured before removing the shoring
and allowing the structural member to carry the design loads.
In the event of suspected damage to the FRP system during
installation, the licensed design professional should be notified
and the FRP system manufacturer consulted.