Concrete Finishing + Placing

Question 1

long, cylindrical steel chute for placing underwater

Answer 1

tremise

Question 2

to avoid excess segregation while placing @ formwork

Answer 2

avoid dropping long distances (5ft typ max),

avoid excess lateral movement.

Question 3

wet material flows in all forms and around all rebar,
prevents honeycombing (airpockets)

Answer 3

Compact

Question 4

As-cast Finishes:

pattern of form (typ for concrete unseen)

Answer 4

rough form finish

Question 5

As-cast Finishes:
joist/tie holes planned so symmetrical.
fins left from concrete seeping into joints removed.

Answer 5

smooth form finish

Question 6

Architectural Finishes:

plastic/wood/metal. parallel rib is common type.

Answer 6

form liner

Question 7

Architectural Finishes:
surface wetted + scrubbed w wire/fiber brush
remove some surface mortar, expose coarse aggregate.

Answer 7

scrubbed

Question 8

Architectural Finishes:
surface wetted w muriatic acid
expose coarse aggregate

Answer 8

acid wash

Question 9

Architectural Finishes:
high-pressure jet mixed w air
remove some surface mortar, expose coarse aggregate.

Answer 9

water jet

Question 10

Tooled and Sandblasted Finishes:
rugged, heavy texture.
remove portion of surface made w form liners
texture depends on form liners used

Answer 10

bush hammering

Question 11

Tooled and Sandblasted Finishes:
finishing technique smoothes out surface of the concrete
similar to terrazzo in appearance

Answer 11

grinding

Question 12

Tooled and Sandblasted Finishes:

application of other matl’s ex. stucco

Answer 12

applied

Question 13

Tooled and Sandblasted Finishes:

remove surface, expose fine/coarse aggregate to varying degrees

Answer 13

sandblasted finishes

Question 14

Rubbed Finishes:
surface wetted and rubbed w carborundum brick
smooth, uniform color and texture

Answer 14

smooth

Question 15

Rubbed Finishes:
grout applied over and smoothed out.
uniform surface w defects concealed.

Answer 15

grout cleaned

Question 16

Concrete Slab Finish Process (after pour):

metal/wood straightedge across form to roughly level

Answer 16

Strike Off

Question 17

Concrete Slab Finish Process (after pour):
if smooth surface is req’d.
brings cement to surface,
consolidates and smooths.

Answer 17

Float

Question 18

Concrete Slab Finish Process (after pour):

performed w hand-held wood/magnesium tool

Answer 18

Float

Question 19

Concrete Slab Finish Process (after pour):

bullfloat

Answer 19

wider w long handle, for large surfaces while standing away

Question 20

Concrete Slab Finish:
if no further work done,
sandpaper-like texture,
exterior finishes. (no surface finish product)

Answer 20

Float Finish

Question 21

Float Finish: wood vs. magnesium float affect

Answer 21

wood float = rougher,

magnesium = smoother

Question 22

Concrete Slab Finish:
used hours after floating.
further consolidates concrete.
hand/large mechanically driven rotary

Answer 22

Light steel troweled finish

Question 23

Concrete Slab Finish:
used hours after floating.
further consolidates concrete.
greatly densifies top ⅛”, very smooth surface

Answer 23

Hard steel troweled finish

Question 24

Concrete Slab Finish:
dislodges fine aggregate, for rough texture.
slip resistance outdoors.

Answer 24

Broom finish

Question 25

Concrete Slab Finish:
hard steel trowel.
typ. industrial warehouses,
automated forklifts+highrack storage

Answer 25

Superflat floor finish