padded cribbing. Space the dunnage close enough to prevent excessive sags.
Stack large quantities of straight bars with adequate protective blocking
between layers. Schedule deliveries of epoxy coated bars to the job site
to avoid the need for long term storage. Protect from direct sunlight and
weather. Bars to be stored longer than 12 hours at the job site shall be
covered with opaque polyethylene sheeting or other suitable equivalent
protective material.
3.2.1.2
Epoxy Coated Steel Reinforcing Steel Placement and Coating Repair
Carefully handle and install bars to minimize job site patching. Use the
same precautions as described above for delivery, handling, and storage
when placing coated reinforcement. Do not drag bars over other bars or
over abrasive surfaces. Keep bar free of dirt and grit. When possible,
assemble reinforcement as tied cages prior to final placement into the
forms. Support assembled cages on padded supports. It is not expected
that coated bars, when in final position ready for concrete placement, will
be completely free of damaged areas; however, excessive nicks and scrapes
which expose steel will be cause for rejection. Criteria for defects which
require repair and for those that do not require repair are as indicated.
Inspect for defects and provide required repairs prior to assembly. After
assembly, reinspect and provide final repairs.
a.
Immediately prior to application of the patching material, any
rust and debonded coating shall be manually removed from the
reinforcement by suitable techniques employing devices such as
wire brushes and emery paper. Care shall be exercised during this
surface preparation so that the damaged areas are not enlarged
more than necessary to accomplish the repair. Damaged areas shall
be clean of dirt, debris, oil, and similar materials prior to
application of the patching material.
b.
Repair and patching shall be done in accordance with the patching
material manufacturer's recommendations. These recommendations,
including cure times, shall be available at the job site at all
times.
c.
Allow adequate time for the patching materials to cure in
accordance with the manufacturer's recommendation prior to
concrete placement.
d.
Rinse placed reinforcing bars with fresh water to remove chloride
contamination prior to placing concrete.
3.2.2
Reinforcement Supports
Place reinforcement and secure with noncorrodible chairs, spacers, or metal
hangers. Support reinforcement on the ground with concrete or other
noncorrodible material, having a compressive strength equal to or greater
than the concrete being placed. [For zinc-coated reinforcement, use
galvanized supports or supports coated with dielectric material.]
[ASTM A 934/A 934M. Epoxy-coated reinforcing bars supported from formwork
shall rest on coated wire bar supports, or on bar supports made of
dielectric material or other acceptable material. Wire bar supports shall
be coated with dielectric material, compatible with concrete, for a minimum
distance of 50 mm 2 inches from the point of contact with the epoxy-coated
reinforcing bars. Reinforcing bars used as support bars shall be epoxy
coated. Spreader bars, where used, shall be epoxy coated. Proprietary
SECTION 03311
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