問題一覧
1
Pour strips in walls that enhance construction joints are called?
Rustication strips
2
The main purpose of welded wire fabric is to control
temperature cracking
3
In the designation of WWF, the MW stands for
metric smooth
4
If rebar bears a W designation, it means it is
weldable
5
A slab bulkhead with a keyway and protruding rebar is a
construction joint
6
Why is there a bulb in the middle of a piece of PVC water stop
Allow for expansion
7
Fusion bonded epoxy, coated rebar is commonly used on bridge decks to prevent
corrosion
8
Corroding rebar will cause the concrete to
spall
9
Water stop is spliced using a
hot iron
10
Water stop is used in a
Construction joint
11
Maximizing, aggregate and ensuring proper gradation will help control
shrinkage
12
Isolation joints allow the independence movement of
concrete member
13
Rebar must be installed on what side of the concrete member?
tension side
14
Minimum coverage for rebar in a footing
75mm 3”
15
When large compressive loads are acting a powder charged coupler may be used to make a
splice
16
In most cases, 24 x the bar diameter would be the length of overlap at a
splice
17
In a cantilever beam the primary reinforcement should be placed
near the top of the beam
18
To counteract shear forces in concrete beams , what type of bar is used?
stirrups
19
Sheer forces may be
Horizontal, vertical, or diagonal
20
Welded wire mesh is used in
Nonstructural slabs
21
when fastening epoxy coated rebar use a
Nonmetallic tie
22
Always install reinforcing in stairs before
riser forms
23
In soffit reinforcement, the bars running the width of the stairs are called
Temperature bars
24
Long walls may require the installation of
Control joints
25
Control joint space, can be increased as slab thickness increases or if
Aggregate size increases
26
The recommended depth for a control joint
1/4 member thickness
27
Chamfer strip can be used to form a
Control joint in a wall
28
Drop panels are capitals are used to counteract
Punching sheer
29
Black Annealed wire is used for tying
Standard rebar
30
Prestressing uses cables to put members into
Compression
31
Prestressed Cast in place concrete is
Post tensioned
32
A post tension cable assembly includes (4 things)
Cable, duct, slab anchor, and clamping wedges
33
Before post tension and can occur concrete must reach what percent of its design strength ?
60-80%
34
Calcium chloride should never be used in
Prestressed concrete
35
Without the engineers, consent, prestressed concrete must not be
Drilled Sawn shot or jackhammered
36
Prestressing includes both
Pre-and post tensioning
37
Pre-tensioning is dependent on the bond between the
Tendon and the concrete
38
In a pretension beam after the concrete is cured, the tendons are
Released creating a camber
39
Pre-tensioning is a Limited to
Precast concrete
40
Pretension and tendons are stretched too. What percent of the ultimate strength
70-80%
41
wooden forms are covered with epoxy resin for a
Smooth finish endurability
42
When erecting tilt up, the braces should be attached to the
Panel prior to lifting
43
Precast bean to column connections are always
Metal on metal
44
A notch in beam which fits into a column projection is called a
dapped connection
45
A beam to column connection that uses wide flange Steel beam is called a
Hidden connection
46
One hollow core sits on top of a block wall The top of the wall must have a
bond beam
47
When lifting tilt up panels rigging should include
Spreader bars and sheaves
48
tilt up Panel connections can be made by
Welding, bolting, or grouting
49
If panels are erected prior to floor installation, the panels are braced to
Dead man piles
50
One method of laterally supporting the bottom of panels is to use
Slotted Pile caps
51
Joints between tilt up panels are sealed with
Foam rod and caulking
52
When erecting precast columns, the column is sat down on a shim pack, or
Levelling nuts
53
What plan must be followed when erecting precast ?
Detail erection plan