Epoxy Coating. Reinforcing steel may be epoxy coated for tropical
construction to reduce corrosion damage in land based concrete construction.
Adhesion to cured concrete is higher than uncoated steel (1500 plus or minus
100 psi). Rebars can be expected to rust only where subjected to oxidation
when the coating is broken, nicked, or abraded. Coatings are tough enough to
withstand most construction activity without appreciable damage; however, bend
and cut reinforcement before epoxy coatings. There are epoxy patch repair
coatings available to touch up nicks and abrasions.
Synthetic Fiber Reinforcing. Synthetic fiber concrete
reinforcement is useful as a secondary concrete reinforcement to reduce
concrete cracking. Cracks that normally would result from drying shrinkage
and temperature changes can be reduced by using this material. Synthetic
fiber in concrete is alkali-resistant and experiences no known corrosion.
Give special consideration to this product as attenuation of shrinkage cracks
Synthetic fiber is strongly recommended for areas such as thin sections,
precast units, vaults, concrete pipes, sidewalks, and especially slabs on
Glass Fiber Reinforcing. Glass fiber reinforced portland cement
concrete allows the production of architectural elements such as cladding
panels without the use of reinforcing steel, resulting in virtually rust-free
members. Glass fiber reinforced concrete is also suitable for use as fascia
panels, soffits, sun screens, mansard roofs and interior feature panels.
However, do not design glass fiber reinforced concrete to carry vertical loads
nor use it as part of the lateral load resisting system of a building,
although it can resist lateral wind loads and its own seismic loads.
Anchors and Inserts. Protect anchors, inserts or any other type of
item, such as connectors used in precast construction, against corrosion by
coating with fusion-bonded epoxy. When possible, hide connectors inside
concrete and grout with non-shrink, nonmetallic grout.
Embedded Items. Wherever possible use hot-dip galvanized embedded
ferrous metals. Follow the hot-dip galvanizing by dipping in a chromate bath.
This requirement also applies to embedded ferrous pipes and conduits which
will be covered with a bituminous or other protective coating before being
embedded in concrete. Do not embed aluminum items in concrete construction.
Accessory Items. Use non-metallic plastic base material for all
chairs and supports for securing reinforcing steel located within 1-1/2 inches
of any concrete surface. Use non-galvanized tie wire with standard
reinforcement to attenuate the galvanic action of dissimilar metals.