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Flashcards in Concrete Reinforcement Deck (21)
1

reinforcement has two types for cast in place:

deformed bars
welded wire mesh

2

Deformed Bars sizes

⅜” - 2 ¼”Ø
⅛” increments up to 1 ⅜”
two special sizes 1 ¾” & 2 ¼”

3

Deformed Bars designations represent:

# of ⅛” increments
ex. no.6 = 6/8” or ¾”

4

Bars are deformed to:

provide mechanical interlocking

5

along with mechanical interlocking, some bonding is provided through

chemical adhesion

6

rebar grades refer to:

yield strength / tensile strength

7

yield strength is measured in

kips per sq in.

8

most common rebar grades

40 + 60

9

along with 40 and 60, these grades are sometimes avaliabel

50 + 75

10

comparitivly, wire for prestressing has much higher tensile strength of

250-270 kips/sqin

11

most common steel classifications used for rebar

axle/rail/billet (most common)

12

Purpose of:
Min clr steel and exposed face of concrete

protect reinforcing

13

Purpose of:
Min clr steel and steel

allow coarse aggregate pass thru

14

Purpose of:
Rebar coated w epoxy or galvanized

protect from corrosive (chlorides) in seawater or deicing salts

15

Welded Wire Fabric is used for

for temperature reinforcement in slabs

16

Welded Wire Fabric uses

cold-drawn steel wires
square pattern @ 4/6”

17

Welded Wire Fabric system of designation:

size (in) x gauge (cross sectional area in 1/100th of sqin)
ex. 6 X 6—W1.4 X 1.4

18

Welded Wire Fabric:
W and D in designation =

W=smooth wire
D=deformed wire

19

other accessories that may need to be placed before pour

welding plates.
electrical boxes/conduit.
sleeves for pipes.

20

used to secure placement of reinforcement until poured, in walls:

spacers

21

used to secure placement of reinforcement until poured, in slabs:

chairs