2.2.5
Identification
Each precast concrete unit shall be marked to correspond to the
identification marks for each different precast unit shown on the detail
drawings.
2.2.6
Finishes
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NOTE: The types of possible finishes for precast
concrete faces are virtually limitless. The
requirements for the project will be specified in
this paragraph.
Some of the most common finishes are as follows:
a.
As cast finishes:
(1) Smooth as cast-produced using smooth, nonporous
forms.
(2) Textured as cast-produced using fluted,
sculptured, board finish or textured form liners.
b.
Mechanically textured finishes:
(1)
Sandblasted concrete finishes:
(a) Brush - remove sheen from plastic, high
density, or metal forms; no reveal.
(b) Light - provide a 0 to 2 mm (0 to 1/16 inch)
reveal of coarse aggregate and uniform color.
(c) Medium - provide a 3 to 6 mm (1/8 to 1/4 inch)
reveal of coarse aggregate.
(d) Heavy - provide a reveal of 13 mm (1/2 inch) to
1/3 of the diameter of the coarse aggregate.
(2) Bush hammered concrete finish - produced by
pneumatic tools fitted with a bush hammer, comb,
chisel, or multiple pointed attachment to remove
approximately 5 mm (3/16 inch) of material
(3) Water jet finish - produced by applying even
coat of retardant to face of form, removing form
after concrete hardens and providing a reveal 1/3 to
1/2 the diameter of coarse aggregate by washing away
surface mortar with water.
(4) Manual brush finish - produced by applying even
coat of retardant to face of form, removing form
after concrete hardens and providing a reveal of 1/3
to 1/2 the diameter of coarse aggregate by brushing
away surface mortar.
(5)
Fractured fin of rib - produced by manual
SECTION 03413A
Page 10
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