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Carpentry Level 3 > G5 - Describe Embedded Materials > Flashcards

G5 - Describe Embedded Materials Flashcards

1
Q

What is a concrete formwork dowel and what is it used for?

A

Dowel - Short piece of rebar
Uses: Connect two separate cast-in-place concrete sections

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2
Q

How are anchor bolts placed when great accuracy is not needed?

A

Inserted into concrete after placement but before concrete sets.

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3
Q

What material is used to make most bolt templates?

A

19 MM lumber or plywood

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4
Q

Why is it not good practice to wiggle anchor bolts to achieve consolidation? What should be done instead?

A

Wiggling to achieve consolidation should be avoided - this tends to consolidate with concrete paste only and will not give a good holding power.

Consolidate by tapping around the bolt on the formwork itself

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5
Q

Describe how to make an expansion joint in a slab:

A

1) Smooth dowel embedded in 1st slab
2) Pour 1st
3) Strip
4) Fiber board
5) Grease dowel use expansion cap and pour 2nd

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6
Q

What is used to fasten pre-cast concrete members together?

A

Welding

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7
Q

List two types of inserts -

A

T-bar and Loop

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8
Q

Which kind of reglet requires no caulkng:

A

PVC

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9
Q

What materials are manufactured reglets made from?

A

PVC or Metal

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10
Q

How are sewer access covers held in place during concrete placement?

A

By own weight

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11
Q

Why are trough forms held down with a ballast?

A

To keep from floating

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12
Q

How are trough forms held in position during concrete placement?

A

Ballast, supported on bricks and ties down or staked.

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13
Q

What are sewer access covers and rates usually made from?

A

Cast iron

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14
Q

What material is used to shim manhole covers in elevation

A

Metal shims

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15
Q

What are the two methods of installing dock levelers?

A

Cast in place or pit mounted

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16
Q

What can be done to support forms from floating as the concrete is being placed around them?

A

1) Ballast
2) Stakes and bracing

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17
Q

How are the forms held in place horizontally?

A

Attached to rebar, braces & stakes

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18
Q

What is used to support the end of the conduit at the dock leveler?

A

Template

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19
Q

List four things to check prior to placing concrete:

A

Control conduits, elevations of top of formwork, level & square.

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20
Q

List two types of waterstops:

A

Serrated and plain

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21
Q

What pressures at waterstops designed to resist:

A

Hydrostatic

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22
Q

What type of constructions are waterstops used?

A

Hydraulic structure, sewage treatment and water tanks.

23
Q

List three properties that all waterstops must have:

A

1) Flexible
2) Continuous
3) Watertight seal

24
Q

What is the widest water stop that can be used for a wall that is 300 mm thick?

A

300 MM WIDE

25
Q

Anchor bolts provide what sort of support?

A

Lateral support transfer from floor system to foundation wall

26
Q

What is a method to accommodate error for an anchor bolt install?

A

Pipe sleeves, they can be adjusted by being slightly bent

27
Q

What must be done to all anchor bolts prior to pour?

A

Protect threads from splatter, wrap with tape or coat with grease

28
Q

Dowels are made from what kind of rebar?

A

Dowel made from deformed or smooth steel bars

29
Q

If dowel penetrates soil, what will happen?

A

Dowel will rust

30
Q

Dowels must penetrate how far in each concrete section if not specified?

A

24 times diameter of dowel

31
Q

Deformed bars are often used in what applications?

A

Keyway forms, to secure stair, porch or cantilever supports

32
Q

Deformed bars have what sort of ridge?

A

Lug like ridges, this allows them to interlock with concrete.

33
Q

Rebar sizing for imperial:

A

10 bar - 10/8

34
Q

Concrete must be set back a minimum:

A

Cast against and in contact with ground: 3”

Exposed to weather: 1.5 to 2”

Not exposed to weather or in contact with ground: 3/4 to 1.5”

35
Q

Lapping bars should overlapped how much:

A

24 times bar diameter

36
Q

Lapping bar vertically should be lapped how much?

A

10 bar diameters for vertical

37
Q

Bending can be done for bars up to what size?

A

up to 15 on site

38
Q

What is the purpose of an expansion joint?

A

Uses smooth dowel to keep two slabs in alignment - Dowel hold both slabs in place while smooth surfaces allows the slab to move horizontally

39
Q

Misc metals must be installed:

A

-Accurately,
-Securely so they don’t move
-Not interfering with formwork

40
Q

Embedded metals are anchored to concrete metals how?

A

Deformed rods, bolts or bent bars.

41
Q

How are handrails attached in concrete stairways?

A

Welded plates

42
Q

How is T bar ceiling hanger installed in a concrete suspended slab?

A

Laid out, then pounded into slab form

43
Q

What is a reglet?

A

A continuous groove that is cut or formed into a wall. Usually above the point of intersection with a flat roof.

44
Q

How is counter flashing installed?

A

Counter flashing is installed by caulking or grouting into the reglet (counter-flashing is placed so that it slows down, directing water away from the joint between wall and roof)

45
Q

A Reglet is usually how deep?

A

25 mm deep

46
Q

How do you form reglets?

A

Wooden strip is nailed to the form, leaving groove when the formwork is dismantled.

Prefab metal strip already filled with caulking, which remains in place after form is removed.

47
Q

How are troughs formed into cocnrete?

A

Using block outs, provide a lip to support grate or drain trough covers.

47
Q

What is a grate?

A

Cast iron metal component installed in a floor to allow water to flow into the drain.

48
Q

What is a dock leveler?

A

Adjustable deck installed on loading docks used to give level access to the back of freight.

49
Q

Formwork for pit-mounted dock levelers :

A

Box that is sent into the surface of a concrete slab, it will be encased with concrete on 5 sides.

50
Q

When is a dumbell waterstop used?

A

When there is significant expansions and contraction expected. Bulb at the centre is able to shift and move with concrete movement.

51
Q

When is a serrated water stop used?

A

Where differential settlement is expected and a firm grip in the concrete is required.

52
Q

What is a caulk grade water stop?

A

Caulk-type waterstop that does not have to be secured to the form as the concrete is poured. Instead it is applied over a construction joint with caulking gun.

Carpentry Level 3 (60 decks)

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