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Carpentry Level 2 > G-4 Slabs > Flashcards

G-4 Slabs Flashcards

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1
Q

Slab-on-grade

A

edge form that defines the shape of slab ontop of a well compacted sub grade that supports the slab. along with suitable reinforcement

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2
Q

Monolithic slab-on-grade

A
  • used in residential and commercial
  • can be very economical and quick to form in place
  • ## footing portion and floor portion under different loads
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3
Q

Isolated slb-on-grade

A
  • poured after footings and walls have been placed

- typically an isolation joint will be places between slab and footing along with air and moisture barrier

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4
Q

Ground prep

A
  • slab is only as strong as material its placed upon
  • if ground is suitable it only needs to be excavated down and levelled to grade
  • different type of sub grade must be laid down if original is not smooth enough
  • if soil is not suitable it must be dug out and replaced with better fill and compacted properly
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5
Q

Forming

A

can be as easy as using 2x4 or 2x12 planks and metal or wood stakes to brace and straighten

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6
Q
  • poured after footings and walls have been places

- typically an isolation joint will be places between slab and footing along with air and moisture barrier

A

Isolated slab - on - grade

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7
Q
  • used in residential and commercial
  • can be very economical and quick to form in place
  • footing portion and floor portion under different loads
A

Monolithic slab-on-grade

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8
Q

slab thickness strength and design are stated in drawings by?

A

Engineer

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9
Q

strength of slab are related to?

A
  • base prep

- compressive strength of concrete mix and proper curing

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10
Q

Durability

A

many industrial buildings require treatments to increase durability against continuos traffic and heavy loads

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11
Q

interior slab durability

A

admixtures may be added to the mix to protect from chemicals, oils, greases. powdered or mechanical hardeners can be applied to the surface of slab during finishing

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12
Q

Exterior slab durability

A

air entrainment is specified for all exterior concrete exposed to freeze thaw cycles. adds microscopic air bubbles to concrete which can expand and contract without great risk of damage.

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13
Q

Reinforcement for slab on grade

A

BCBC does not require reinforcement on slab on grade but many carpenters put in anyway
- concrete in contact with ground rebar should be kept 3” (75mm) off the ground along with poly vapour barrier

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14
Q

Elevation of exterior slab on grade

A

must be low enough not to cause meltwater or stormwater to back up and enter building
- should be sloped at least 1/8th per foot

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15
Q

elevation on interior slabes

A

required by BCBC to have bottom of slab higher then top of perimeter drain

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16
Q

Isolation joint

A
17
Q

Expansion/contraction isolation joint

give and take strips

A

should be placed in slabs at least every 15m (50’) used to isolate one concrete member from another and designed to allow for vertical and horizontal movement.

18
Q

Controle Joints

A

is weakening in concrete slab that is designed to control natural cracking due to shrinkage.

  • driveways and garages: 3m apart
  • sidewalks : 1.5 m apart
19
Q

Flate plate slab (suspended)

A
  • simplest for of suspended slab
  • stays same thickness throughout and when stripped has no distinguishing features in the soffit
  • free spans from support to support
  • relies only on its own strength and rebar to hold it up.
20
Q

Flat slab (suspended)

A
  • columns that hold up slab will have either a column capital or drop panel or both to help support slab
  • these at as shear support and act to reduce span of slab and will allow columns to be further spaced apart
21
Q

One way slab

A
  • slab where there is some sort of support from column to column. spans fro beam to beam
  • load carrying steel in slab runs perpendicular to the beams
22
Q

two-way slab

A

load carrying steel runs in both directions

23
Q

One way Ribbed slab

A
  • uses series of metal pans secured end- to- end to the slab deck to create a joist pattern in slab.
  • the ribs or joists are poured monolithic with slab to allow slab to be quite thin
  • when stripped you can see joist shaped can be seen running from beam to beam
24
Q

two way ribbed slab

A
  • sam except dome pans are installed an to create grid pattern.
  • when stripped creates a waffle pattern
25
Q

Girders

A

Span from column to column

26
Q

Intermediate beams

A

span between girders

27
Q

Spandrel beam

A

beam at perimeter of slab

28
Q

Capital forms

A

designed to attach to the columns formwork at the top

29
Q

Concrete shoring

A

shoring is used to insure safety for workers and quality .

shoring system is referred to as falsework and supports the formwork concrete structure.

30
Q

Falsework

A

is a structure in its self

- requires its own foundation vertically and horizontally with bracing

31
Q

difference between falsework and formwork

A
  • not always clear
  • by definition falsework supports the form work
    falsework is everything put in place so a suspended slab can happen
32
Q

Sigle vertical shore

A
  • normally 4x4 wood used as vertical support

- cut 1 and a half inches short to allow pair of wedges used to adjust shore length

33
Q

Slenderness ratio

A
  • each single shore may require horizontal braces along height.
  • braces are used to prevent blowout
    MUST NOT EXCEED 1:50 meaning 1 is minimum cross sectional dimensions and 50 is the unsupported height of shore

Ex task is to shore up vertical distance of 18’

  • turn feet into inches 18x12= 216”
  • then divide by slenderness ratio *if answer is more then 4 posts need to be laterally braces
  • 216/18= 4.32”
  • therefor posts must be laterally supported
34
Q

ellis Clamps

A

two wooden shores can be joined and made adjustable by ellis clamps

  • ellis clamp is metal clamp used to transfer load from one 4x4 post to another joined post
  • as force enters top of shore, the right handed side of clamp is forced down and clamp is tightened up
35
Q

steel shore

A
  • Single telescopic steel shores are often used in falsework

- can adjust height with rotating riser

36
Q

Scaffold shoring

A
  • strength of metal and speed at which it can be set up makes its the most economical system for falsework .
  • must be approved by engineer
37
Q

Flying forms

A
  • big scale projects have pre fab formwork
  • two types
  • gang forms: used for forming walls
  • slab tables: used to form suspended slabs

both made from combining wood and metal.

38
Q

Aluma-beam

A
  • aluminum extrusion that is in the shape of an i-beam

- has wooden 2x2 at top and a groove at bottom that will accept the head of a bolt to fasten it to scaffold shoring

Carpentry Level 2 (20 decks)

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