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Builder Registration > Slabs & Footings > Flashcards

Slabs & Footings Flashcards

1
Q

What are the 3 main foundation systems

A

Strip Footing
Waffle Slab
Raft Slab

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2
Q

What is a strip footing?

A

Rectangular cross section poured in a continuous horizontal reinforced strip for placement underneath a wall

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3
Q

What is a stiffened raft slab?

A

Concrete slab on ground with external and internal stiffening beams

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4
Q

What is a waffle pod slab?

A

Stiffened slab constructed on ground

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5
Q

Foundation movement for slabs & footings are measured as how much chance of happening over what period?

A

Less than 5% chance of being exceeded over 50 years.

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6
Q

Site Classifications

A

A, S, M, H1, H2, E, P

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7
Q

Site Classification, what does A stand for?

A

Sand and rock sites - Little or no movement

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8
Q

Site Classification, what does S stand for?

A

Slight movement - Clay sites

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9
Q

Site Classification, what does M stand for?

A

Moderately reactive clay site

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10
Q

Site Classification, what does H1 stand for?

A

Highly reactive clay site with high ground movement from moisture change

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11
Q

Site Classification, what does H2 stand for?

A

Highly reactive clay site with very high ground movement from moisture changes

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12
Q

Site Classification, what does E stand for?

A

Extremely reactive site with extreme ground movement from moisture changes.

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13
Q

Site Classification, what does P stand for?

A

Problem - Soft or unstable foundations, reactive site subject to abnormal moisture conditions

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14
Q

Maximum length of slab before control joint required?

A

AS 2870 - 30m
NCC - 18m

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15
Q

What are vapour barrier requirements?

A

-.2mm thick
-Medium impact resistant vapour barrier
-Damp-proofing membrane - High impact resistant
-200mm overlap
-Taped penetrations

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16
Q

Minimum bearing pressure required for an edge beam & Strip footing kPa

A

Edge Beam 100kPa
Strip Footing 50kPa

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17
Q

What are the MPA, aggregate size and nominal slump requirements for a slab

A

NCC 4.2.10 (a) (i) Strength @ 28 days not less than 20MPA
(ii) 20mm max aggregate
(iii) Nominal 100mm slump

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17
Q

Trench Mesh and Slab Mesh overlap requirements?

A

Trench Mesh - 500mm (full width across section)

Slab Mesh - 2 outermost transverse wires must overlap the same other sheet

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17
Q

Minimum edge rebate depth?

A

20mm

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18
Q

What is required at the internal corners of a slab?

A

Re-entrant or internal corner reinforcing 2000mm long on a 45degree angle

19
Q

If an edge beam requires deeper excavation this becomes?

A

Deepened edge rebate

20
Q

How many strips of reinforcement need to be placed in a strip footing?

A

2 - Top and Bottom

21
Q

Df meaning?

A

Depth of footing

22
Q

What is the maximum spacing of an internal beam from an external corner?

A

4 meters

23
Q

Where 1 side of a re-entrant corner is less than 600mm, what is the minimum length of the continuity beam?

A

2 X D minimum.

24
Q

What is the maximum offset for a LBW?

A

1000mm

25
Q

Concrete Cover to Unprotected Ground

A

40mm

26
Q

Concrete cover to a membrane in contact with the ground?

A

30mm

27
Q

Concrete cover to an internal surface?

A

20mm

28
Q

Concrete cover to external exposure?

A

40mm

29
Q

Bar chair spacings centeres?

A

800mm

30
Q

Minimum splice for reinforcing bars

Up to 12mm
12mm - 16mm

A

Up to 12mm - 500mm minimum

12mm - 16mm - 700mm minimum

31
Q

For design purposes, the life of a structure is said to be how long?

A

50 years

32
Q

On a stiffened raft slab how thick must a slab be where slab thickening supports a load bearing wall?

A

150mm

33
Q

On a stiffened raft slab how wide must the slab thickening be where it supports a LBW?

A

500mm

34
Q

In a stiffened raft slab up to 18m long what size mesh is used?

A

SL72

35
Q

In a stiffened raft slab between 18m and 25m long what size mesh is used?

A

SL82

36
Q

In a stiffened raft slab greater than 25m long what size mesh is used?

A

SL92

37
Q

In a waffle raft slab what is the allowable thickness of a garage slab?

A

85mm

38
Q

List the requirements for fireplace footings on a Class A and S site
Single storey pad thickness?
Double storey pad thickness?
Pad footings to be reinforced with what size mesh and extending how far past the edges of masonry?

A

Single storey - 150mm
Double storey - 200mm
Mesh size SL72
Extended 300mm past masonry edge

39
Q

Where can service penetrations sit in edge and stiffening beams?

A

Middle 3rd

40
Q

What is the minimum depth of concrete below the edge rebate?

A

150mm

41
Q

Where the edge rebate is greater than 400mm, what is the minimum stem width?

A

200mm

42
Q

What are the 3 re-entrant reinforcement options?

A

2 Strips of 3-L8TM
1 Strip of 3-L11TM
or
3 x N12 Bar

43
Q

At external corners what is the MAXIMUM distance from external beam to 1st internal beam?

A

4m centre

44
Q

If a beam cannot be placed in a straight line what is the maximum deviation ratio allowed?

A

1 in 3

45
Q

Slab beam layout

A
46
Q

What are the angle of repose degrees for sand and clay?

A

Sand 30 Degrees
Clay 45 Degrees

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