Concrete Formwork

Question 0

plywood formwork supported with framing termed:

Answer 0

strongback (v)
waler (h)
soleplate (base)

Question 1

to prevent plywood formwork from sticking:

Answer 1

coat inside w oil,
water resistant glue,
plastic

Question 2

prefab steel forms offer:

Answer 2

strength and reusability

Question 3

prefab steel forms often used for:

Answer 3

one-way joist systems/
waffle slabs/
round columns/
special shapes

Question 4

Glass-fiber reinforced plastic offer:

Answer 4

patterns embedded

Question 5

most common formwork

Answer 5

3/4” plywood

Question 6

Form ties

Answer 6

hold form together + prevent collapse

Question 7

Form ties: threaded rods

Answer 7

unscrewed / reused

Question 8

Tie holes

Answer 8

round hole, so tie cut off below surface

Question 9

moves continuously AS concrete cures

Answer 9

Slip forming

Question 10

Slip forming moves at a rate:

Answer 10

6-12” per hr

Question 11

Slip Forming typ used @

Answer 11

continuous surfaces (tunnels/high-rise cores)

Question 12

large fabricated sections of framework
removed once cured
reused in identical section above
used @ highly repetitive units (hotels/apartments)

Answer 12

Flying forms

Question 13

Tolerances:

max var in plumb for whole structure: (in bldgs < 100’)

Answer 13

1” for int. columns

½” for corner columns

Question 14

Tolerances:

for columns/piers/walls = max. var in plumb

Answer 14

±1/4” in 10’ length

Question 15

Tolerances:

finished concrete floors can be specified

Answer 15

from ± ⅛” in 10’ for very flat slabs,

to ± ½” for bull floated slabs.

Question 16

Tolerances:

max var in total length of bldg:

Answer 16

±1”

Question 17

Tolerances:

elevation control points for slab-on-grade

Answer 17

½” in any 10’ bay

± ¾” total length of structure

Question 18

Tolerances:

elevated, formed slabs

Answer 18

± ¾”

Question 19

one of the largest expenses for cast in place concrete

Answer 19

formwork