Concrete Finishing + Placing Flashcards
long, cylindrical steel chute for placing underwater
tremise
to avoid excess segregation while placing @ formwork
avoid dropping long distances (5ft typ max),
avoid excess lateral movement.
wet material flows in all forms and around all rebar, prevents honeycombing (airpockets)
Compact
As-cast Finishes:
pattern of form (typ for concrete unseen)
rough form finish
As-cast Finishes:
joist/tie holes planned so symmetrical.
fins left from concrete seeping into joints removed.
smooth form finish
Architectural Finishes:
plastic/wood/metal. parallel rib is common type.
form liner
Architectural Finishes:
surface wetted + scrubbed w wire/fiber brush
remove some surface mortar, expose coarse aggregate.
scrubbed
Architectural Finishes:
surface wetted w muriatic acid
expose coarse aggregate
acid wash
Architectural Finishes:
high-pressure jet mixed w air
remove some surface mortar, expose coarse aggregate.
water jet
Tooled and Sandblasted Finishes:
rugged, heavy texture.
remove portion of surface made w form liners
texture depends on form liners used
bush hammering
Tooled and Sandblasted Finishes:
finishing technique smoothes out surface of the concrete
similar to terrazzo in appearance
grinding
Tooled and Sandblasted Finishes:
application of other matl’s ex. stucco
applied
Tooled and Sandblasted Finishes:
remove surface, expose fine/coarse aggregate to varying degrees
sandblasted finishes
Rubbed Finishes:
surface wetted and rubbed w carborundum brick
smooth, uniform color and texture
smooth
Rubbed Finishes:
grout applied over and smoothed out.
uniform surface w defects concealed.
grout cleaned
Concrete Slab Finish Process (after pour):
metal/wood straightedge across form to roughly level
Strike Off
Concrete Slab Finish Process (after pour):
if smooth surface is req’d.
brings cement to surface,
consolidates and smooths.
Float
Concrete Slab Finish Process (after pour):
performed w hand-held wood/magnesium tool
Float
Concrete Slab Finish Process (after pour):
bullfloat
wider w long handle, for large surfaces while standing away
Concrete Slab Finish:
if no further work done,
sandpaper-like texture,
exterior finishes. (no surface finish product)
Float Finish
Float Finish: wood vs. magnesium float affect
wood float = rougher,
magnesium = smoother
Concrete Slab Finish:
used hours after floating.
further consolidates concrete.
hand/large mechanically driven rotary
Light steel troweled finish
Concrete Slab Finish:
used hours after floating.
further consolidates concrete.
greatly densifies top ⅛”, very smooth surface
Hard steel troweled finish
Concrete Slab Finish:
dislodges fine aggregate, for rough texture.
slip resistance outdoors.
Broom finish
Concrete Slab Finish:
hard steel trowel.
typ. industrial warehouses,
automated forklifts+highrack storage
Superflat floor finish
