G8 - Install Specialized Formwork

Question 1

What is used to temporarily secure tilt-up panels?

Answer 1

adjustable braces

Question 2

How are tilt-up panels permanently secured to one another after they are set in place?

Answer 2

bolted or welded

Question 3

What is done to ensure uniform panel surfaces when casting tilt-up panels?

Answer 3

The slab is steel trowelled very flat, smooth and level.

Question 4

How are fragile tilt-up panels with openings protected when they are being lifted?

Answer 4

They have strong backs attached to them.

Question 5

How is a slab design changed if a crane is to work on it?

Answer 5

It is designed to withstand heavy loads.

Question 6

What is used at the bottom of tilt-up panels to temporarily hold them in position?

Answer 6

dowels or guide pins

Question 7

What type of surface does seeding produce on a tilt-up panel?

Answer 7

exposed aggregate

Question 8

What kind of forming material is most commonly used in tilt-up construction?

Answer 8

wood

Question 9

Why is additional reinforcing steel commonly added to tilt-up panels?

Answer 9

To resist loads imposed by lifting

Question 10

Why is it important to locate lifting inserts in tilt-up panels as specified by the engineer?

Answer 10

to evenly distribute the loads resulting from the lift

Question 11

What type of form is sometimes built vertically between tilt-up panels?

Answer 11

pilaster form

Question 12

What occurs after the tilt-up panels are plumb with wall braces installed?

Answer 12

The crane is released.

Question 13

What is the usual minimum number of braces per tilt-up panel?

Answer 13

2

Question 14

What must be done if any changes occur to a tilt-up panel design?

Answer 14

Changes are authorized by a registered engineer.

Question 15

How are joints between tilt-up panels weatherproofed?

Answer 15

Backer rod and caulking are applied between panels.

Question 16

What is usually used to hold pre-cast units permanently in place?

Answer 16

welded plates

Question 17

After erecting pre-cast panels, what is done with their surface lifting-loops?

Answer 17

They are cut off.

Question 18

Once pre-cast units are ready for assembly, which piece of equipment must be available at all times?

Answer 18

crane

Question 19

Which component is usually installed right after footings and foundations are in place?

Answer 19

columns

Question 20

If the following components are all to be used in a structure, which of them should be set in place last?

Answer 20

T-joists

Question 21

If the following components are all to be used in a structure, which of them should be set in place second?

Answer 21

girders

Question 22

Which of the following would be best suited to moving and erecting heavy, delicate architectural panels without lifting rings?

Answer 22

flat nylon slings

Question 23

What is often placed on top of T-joists or rough floor slabs?

Answer 23

topping concrete

Question 24

Which of the following is often designed to carry only its own weight?

Answer 24

curtain wall

Question 25

What type of concrete construction incorporates “pre-tensioned” or “post-tensioned” cables?

Answer 25

pre-stressed

Question 26

In pre-stressed concrete, what are the tendons used for?

Answer 26

to counteract external tension on the concrete

Question 27

Why are some concrete members pre-stressed?

Answer 27

to strengthen them

Question 28

What is the term used to describe the system when cables are placed in a member and tightened after the concrete is cast?

Answer 28

post-tensioned

Question 29

In post-tensioned beam construction, what are tendons attached to and tightened against?

Answer 29

ends of the beam

Question 30

When are pre-stressed members pre-tensioned?

Answer 30

before concrete is placed

Question 31

In pre-tensioned applications, how are cables held in a draped position?

Answer 31

cable tie-downs are attached to the casting bed

Question 32

Why are pre-tensioned components usually made in permanent plants?

Answer 32

Special casting beds are required.

Question 33

What usually happens to concrete beams as tendons are stressed?

Answer 33

the middle lifts

Question 34

What is the term used for members with cables placed into a concrete form and tightened before the concrete is cast?

Answer 34

pre-tensioned

Question 35

In post-tensioned concrete beams, what keeps the cables from slipping through the concrete?

Answer 35

anchorage using wedge-like clamps

Question 36

When is pre-tensioning carried out?

Answer 36

before the concrete has been placed

Question 37

What is the slight inward leaning of vertical slip-forms called?

Answer 37

form batter

Question 38

What is the integral member that hold a slip form assembly together?

Answer 38

yoke

Question 39

What limits the size of the lifting loads of slip-form jacks?

Answer 39

strength of the rods

Question 40

When slip-forms are used, what components must withstand the entire pressure of concrete forms?

Answer 40

yokes

Question 41

What is the maximum rate of upward movement for slip-forms?

Answer 41

18” per hour

Question 42

On slip-forms, to what is the working deck attached?

Answer 42

yoke

Question 43

What has traditionally been used to make the curved walers for slip-forms?

Answer 43

laminated lumber

Question 44

What is the height of the sheathing for a typical vertical slip-form?

Answer 44

36” – 42”

Question 45

For maximum strength, at what angle to the forms should anchors and ties be?

Answer 45

90°

Question 46

Why can cantilevered forms on mass concrete projects be as high as 10’?

Answer 46

The forms are so long and wide that the rate of placement is very low.

Question 47

In mass concrete applications, what is the purpose of panel-aligning bolts?

Answer 47

to adjust the form for alignment

Question 48

When mass concrete is placed, which component must withstand the entire pressure of the concrete forms?

Answer 48

anchors

Question 49

What is the size of a typical concrete lift in mass forming?

Answer 49

7’

Question 50

What type of concrete structures are gravity dams, ship locks and gravity retaining walls?

Answer 50

mass concrete

Question 51

What is the maximum allowable sheathing deflection for architectural concrete required by the CSA standards?

Answer 51

1/400

Question 52

When casting architectural concrete, what may be required when using form liners?

Answer 52

A bond breaker

Question 53

Which of the following best describes the use of rustication strips?

Answer 53

Strips used to conceal construction joints

Question 54

What are weld plates used for in precast concrete construction?

Answer 54

To connect the precast sections

Question 55

Why must forms for architectural concrete be built stronger or have lower rates of placement than other forms?

Answer 55

The forms have lower specified deflection ratios, as the surface will be the wall finish., The extensive use of plasticisers in architectural concrete produce higher form pressures.

Question 56

What are the factors that affect the maximum rate of placement into a form?

Answer 56

ambient temperature, slump, concrete density, tie pattern and strength

Question 57

Why does standard form-ply have painted edges?

Answer 57

to prevent moisture absorption

Question 58

What type of ties are required when using form liners?

Answer 58

ties that are longer and incorporate rubber washers at each end.

Question 59

Which of the following statements best describe form liners?

Answer 59

reduce the effective wall thickness which must be accounted for

Question 60

What is done to achieve an exposed aggregate finish on a vertical wall?

Answer 60

Apply a surface retarder to the inside of the form

Question 61

Which drawings would include the location and details of metal embeds?

Answer 61

Architectural and Structural

Question 62

What is the term used to describe disposable forms used to create complicated details?

Answer 62

Waste mould

Question 63

What is the purpose of a “reveal” on an exterior concrete soffit?

Answer 63

To create a drip line

Question 64

Who or what determines when re-shores can be removed?

Answer 64

The engineers approval

Question 65

How is an exposed aggregate finish on a slab achieved?

Answer 65

By using a gap graded mix

Question 66

What is typically done on an architectural, rectangular column to prevent spalling at the corners?

Answer 66

Install chamfer strip

Question 67

When stripping forms, what should be done to reduce marring of the fresh concrete surface?

Answer 67

Use wooden wedges or levers

Question 68

What is the main advantage of two part caulking compounds?

Answer 68

They cure by chemical reaction and can be used underwater.

Question 69

What is the cross section shape of the caulk when a combination of backer rod and tooling is used?

Answer 69

an hourglass

Question 70

Caulking should be removed and replaced on a regular basis. What is the recommended maximum interval for this maintenance procedure?

Answer 70

5 years

Question 71

How do acrylic based caulking compounds cure?

Answer 71

through solvent loss

Question 72

Which of the following statements best describe polysulfide based caulking compounds?

Answer 72

They release harmful vapours as they cure.

Question 73

Which of the following statements best describe butyl base caulking?

Answer 73

It is available in different colours.

Question 74

What is required for silicone caulking to cure properly?

Answer 74

atmospheric moisture

Question 75

What is required for the placement of backer rod?

Answer 75

It must be compatible with the caulking material being used.

Question 76

Which of the following statements best describe bond breaker tape?

Answer 76

It ensures that the caulking bonds only to two surfaces on either side of the joint.