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LA Contractors License > Pile_Foundation > Flashcards

Pile_Foundation Flashcards

1
Q

A branch line feeds a fire hose 45’ from the riser, what’s its size?

A

1.25”

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2
Q

According to the code, steam pipe which must be buried by tunneling, the trench may be no longer than _________ when the trench is 14’ deep.

A

7

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3
Q

According to code, plates or sills shall be anchored to concrete foundation walls with bolts spaced not more than how far apart?

A

72”

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4
Q

According to code, what is the minimum thickness permitted for a concrete slab that is supported directly on the ground?

A

3 1/2”

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5
Q

A slab has just been placed and finished. It is normal concrete. According to code, unless accelerated curing methods are used, the slab must be cured in a moist condition for at least:

A

7 days

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6
Q

After one season, a concrete slab shows crazing and dusting and spalling. These defects were caused by:

A

Working the surface while bleed water was present

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7
Q

What should be done when the excavation for a footing is dug too deep in some places?

A

The excavation should be dug out so that the bottom is level and a thicker footing poured

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8
Q

Steel embedded in concrete almost always becomes:

A

Cathode

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9
Q

Horizontal members on the outside of prefabricated forms used to straighten and align forms are called

A

Walers

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10
Q

Piles are specified for a bridge. What action drives a single acting pile driver?

A

They fall by gravity

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11
Q

A contractor cannot place backfill material against a concrete structure wall until the concrete has developed a compressive strength of _____ PSI

A

3000

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12
Q

What is a Jackshore?

A

A single all metal adjustable post

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13
Q

Concrete consistency is determined by

A

Slump

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14
Q

Segregation in concrete walls is caused by:

A

Excessive water to cement ratio

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15
Q

According to design and control of concrete mixtures, water tightness in concrete is best achieved by which of the following

A

Low cement to water ratio

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16
Q

What is the main purpose for installing a sub-surface dewatering system

A

Lower water table

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17
Q

In what soil will a well-point dewatering system be most effective?

A

Sand

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18
Q

When is sheet piling installed in areas with a high water table

A

Before excavation

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19
Q

Concrete used in public works flood control and drainage systems must be air-entrained within what percentage range?

A

4%-7%

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20
Q

If the subgrade is damp prior to placing a concrete slab during hot dry weather, it will

A

Prevent the subgrade from drawing too much water from the concrete

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21
Q

Difference between piers and pilasters used in masonry construction?

A

Piers are isolated and freestanding whereas pilasters are built into a wall thickening a small wall section

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22
Q

When joints to control cracking in concrete slabs are cut, they should be cut to a depth of:

A

1/4 the slab thickness

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23
Q

What are all the tests that may be required in the project specs for concrete quality control?

A

Strength, slump, air

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24
Q

When super plasticizers are used in a concrete mix:

A

Less water will be needed for the same workability

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25
Q

Which factor does not affect the lateral pressure of plastic concrete form wall?

A

Use of air-entrained mixture

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26
Q

A failed concrete slab contains a construction joint. What is used to continue a construction joint through a concrete patch repair?

A

Permanent bond breaker

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27
Q

Concrete curing procedures for a new slab should begin immediately after:

A

Finishing is complete

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28
Q

After one season, a concrete slab shows crazing and dusting and spalling. These defects were caused during finishing by:

A

Overworking the concrete surface

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29
Q

A concrete slab is to be poured during hot dry weather. What is the result when the subgrade is moistened with water just before pouring the slab?

A

There will be an increase in the water to cement ratio, which reduces concrete strength

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30
Q

If concrete weighs 150 pounds per cubic foot, it will place a load on the forms of _______ pounds per square foot for each inch of slab thickness

A

10

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31
Q

To what depth are concrete control joints raked?

A

1/2”

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32
Q

Material that must be removed from reinforcing steel before placement

A

Dry mortar

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33
Q

Concrete blocks piers are being used to support a manufactured home. The cells must be reenforced with concrete and steel if the height of the piers exceeds a minimum of

A

48”

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34
Q

What are the minimum acceptable dimensions for a wood cap on a pier that is 42” high?

A

2x8x16

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35
Q

What is the minimum acceptable thickness for a masonry pier cap?

A

4”

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36
Q

Piers shall be spaced a maximum of how many feet on center?

A

8’

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37
Q

What is the minimum length of time that a concrete slab, beam, or footing (other than high early), must cure to achieve 70% of its design strength?

A

7 days

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38
Q

Purpose of bull floating a freshly placed slab is to

A

Embed large aggregates and level the surface

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39
Q

Troweling of a fresh concrete is performed following the _______ of the slab

A

Floating

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40
Q

Air entrainment of concrete is to

A

Improve the freeze thaw resistance

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41
Q

How many layers of concrete are in a slump test?

A

3

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42
Q

What type of pile has the most friction

A

Wood

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43
Q

What is a pile driven on an angle called?

A

Battered

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44
Q

A _________ is used to perform a slump test

A

Cone

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45
Q

Reinforcing steel in a slab is used for ________ strength

A

Tensile (flexural)

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46
Q

Under ASTM standards, an engineered design mix for freshly batch concrete, (other than type III cement) would require _________ days for full field curing time.

A

28

47
Q

What do you use to increase compression strength in concrete?

A

Vibration

48
Q

A ____ is used for a test to measure compression strength in concrete

A

Cylinder

49
Q

A reinforcing bar is protruding from a slab with the #5 stamped on it. This means that the diameter of the bar is ______ inches

A

.625

50
Q

What is the time for a moisture cure on a slab

A

7 days

51
Q

Duplex nails are used for

A

Forming

52
Q

As concrete sets, it releases hear known as:

A

Heat of hydration

53
Q

What is not a factor when working with concrete?

A

Resistance

54
Q

How far does a control joint enter the slab?

A

1/4 the depth

55
Q

A part of a concrete wall that gives lateral support is called

A

Buttress

56
Q

Not a standard deformed rebar size?

A

15

57
Q

Concrete has been placed and will not be subject to accelerated curing. What is the minimum temperature the concrete must be maintained at during curing?

A

50°

58
Q

In multi story slab form work, where should shores be located relative to those on the level below?

A

Directly above

59
Q

At the absence of the engineered specified strength, what is a guideline for the removal of wall and column forms?

A

48 hours

60
Q

Which of the following types of pan is used to form a two-way waffle slab?

A

Dome

61
Q

Anchor bolts are to be used to connect a plat to a concrete slab. The minimum spacing of the bolts will be _______

A

24”

62
Q

What is the minimum compaction that is required for soil under a concrete slab?

A

90%

63
Q

Specs for readymixed concrete conforming to ASTM C94 standards require that the discharge of concrete be completed within 1 1/2 hours or ______ drum revolutions

A

300

64
Q

Concrete is to pumped into place using a concrete pump. How must the concrete pumping operation occur?

A

It should be continuous

65
Q

How far apart should control joints be spaced in a 6” slab?

A

15’

66
Q

Which of the following is used to measure the consistency and workability of concrete?

A

Slump

67
Q

All concrete that will be exposed to freeze/thaw conditions should:

A

Be air entrained

68
Q

Which of the following types of Portland cement is used in massive concrete structures where low heat of hydration is required

A

IV

69
Q

Structural concrete slabs, columns, and other members should be protected to ________ percent of their design strength

A

70%

70
Q

In comparing normal concrete to high early concrete (Type III), how much do you reduce the curing time for high early?

A

4 days

71
Q

What type of hammer drives piles the fastest?

A

Vibratory

72
Q

A pile that is driven into the ground and leaves the shell or casing in is called what?

A

Shell

73
Q

What powers a single action pile driver?

A

Gravity

74
Q

Aggregate particles used for concrete should be shaped like?

A

Cubes

75
Q

The purpose of adding wire mesh to concrete is to

A

Increase the flexural strength

76
Q

When pouring concrete on a hot day, what would you not do?

A

Make sure the forms are dry

77
Q

Under a slab, what would be the best soil?

A

Undisturbed or existing soil

78
Q

If you saw cut a slab, what type of joint will you create?

A

Control

79
Q

Compared to wood poles, concrete poles have the advantage of _________

A

Availability

80
Q

Concrete curing procedures and curing compounds should be applied:

A

After final finishing, as soon as the concrete surface is dry

81
Q

In slip firm construction, to insure proper placement of the concrete:

A

Low slump concrete is required

82
Q

What type of foundation covers an entire site and consists of heavily reinforced concrete that is 3 feet to 8 feet in thickness

A

Mat

83
Q

When compacting a base for concrete or other soil materials which require compacting, compaction by a vibratory roller is most effective on materials that are primarily

A

Sand or gravel

84
Q

Lateral rebar placed in a one way concrete slab to allow for movement due to changes in temperature is called

A

Temperature steel

85
Q

The placing of concrete on frozen soil is

A

Never acceptable

86
Q

The volume of one 94 pound bag of Portland cement is _______ cubic foot/feet

A

1

87
Q

If the specs call for a 40 bar diameter lap on rebar, the length of lap or splice on a #4 bar is

A

1’ 8”

88
Q

According to code, reinforcing steel which is cast against and permanently exposed to earth must have a minimum cover of at least ______ inches

A

3

89
Q

For the same workability, for air entrained concrete you should

A

Decrease the water

90
Q

What would be used to seal out or cancel water from penetrating through a concrete joint?

A

Water stop

91
Q

Manually controlled powered concrete trowels shall be equipped with a

A

Hand release shut off or kill switch

92
Q

A number 6 reinforcing bar that is not exposed to the soil or weather must have a minimum concrete cover of at least

A

3/4”

93
Q

How much should you decrease the water if you have air entrained concrete with 1-1/2” aggregate and a 2” slump

A

20%

94
Q

How many tests for strength of concrete should be performed for a pour of 750 cubic yards

A

5

95
Q

What causes cracks in concrete during hot weather?

A

Rapid drying of top

96
Q

Defined as a groove (formed or saw-cut) in the concrete placed where the shrinkage of the concrete would cause a crack.

A

Control joint

97
Q

In the normal concrete finishing process, __________ is performed prior to bull floating.

A

Screeding

98
Q

Super-plasticizers used in concrete will cause:

A

A decrease in the amount of water needed to provide workability

99
Q

Concrete application with forms, wire cages, and plastic is called

A

Inpinged

100
Q

Concrete strength depends on a correct water/cement ratio. Water used for concrete mixing must be metered and discharged within all acceptable tolerance limits of _____ %

A

5

101
Q

Portland cement concrete pavement must achieve a minimum compressive strength of 3850 psi within how many days of placement?

A

28

102
Q

What is the minimum finish grade slope for the land around a foundation?

A

The finish grade must slope sufficiently to drain water away from the foundation

103
Q

What is the most likely result of rapid moisture loss from a concrete slab after the concrete is placed?

A

Dusting

104
Q

When using wire mesh in a concrete slab placed directly on the earth, place the mesh in minimum of ______ inches down from the surface

A

1 1/2

105
Q

The main purpose of using an isolation joint in concrete slabs is to:

A

Separate between concrete pours

106
Q

A common admixture that causes concrete to set up faster is ________

A

Calcium chloride

107
Q

Regarding a masonry pier, as a general rule of thumb, the maximum height of the pier is ______ times the least dimensional width of its base

A

10

108
Q

What is the reccomend type of Portland cement to be used in concrete which is exposed to severe sulfate conditions?

A

V

109
Q

In a slab, the maximum size of the aggregate shall not exceed ________ the thickness of the slab

A

1/3

110
Q

The depth of a foundation footing is determined by

A

Frost depth

111
Q

Adding water to concrete that is already workable will decrease the concretes

A

Strength

112
Q

What type of pile is enlarged on the ends in order to provide a larger bearing area?

A

Bell pile

113
Q

A wall that is poured as part of the foundation is what?

A

Monolith

114
Q

What is the minimum temperature of concrete when the ambient temperature is 35 F?

A

40

LA Contractors License (6 decks)

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