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Concrete Exam > Test 5 > Flashcards

Test 5 Flashcards

1
Q

Horizontal an vertical tie off. What is the minimum rebar from inside the wall?
A) 1/8 inch
B) 1/4 inch
C) 1/2 inch
D) 3/4 inch

A

D) 3/4 inch

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2
Q

What is the minimum load bearing PSI for a residential building?
A) 1250 psi
B) 2000 psi
C) 2500 psi
D) 4500 psi

A

C) 2500 psi

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3
Q

What is the minimum support on structural wall?
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches

A

C) 4 inches

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4
Q

Test cylinders. How many tests per day on 150 yards?
A) one
B) two
C) three
D) four

A

C) three

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5
Q

What is the overlap for filter fabric?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches

A

C) 18 inches

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6
Q

When you have excessive bleeding in concrete what should you do?
A) add more sand
B) add more water
C) add more aggregate
D) broom off

A

A) add more sand

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7
Q

What is the minimum air entrainment on 5000 psi in concrete?
A) 1%
B) 2%
C) 3%
D) 4%

A

A) 1%

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8
Q

How much time do you have to place concrete into the forms after mixing?
A) 20 mins
B) 30 mins
C) 40 mins
D) 60 mins

A

B) 30 mins

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9
Q

How much coverage for concrete columns?
A) 1 inch
B) 1 1/4 inches
C) 1 1/2 inches
D) 1 3/4 inches

A

C) 1 1/2 inches

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10
Q

What is the minimum strength on high strength concrete?
A) 3000 psi or higher
B) 4000 psi or higher
C) 5000 psi or higher
D) 6000 psi or higher

A

D) 6000 psi or higher

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11
Q

Forklift joint spacing 36 times slab thickness wider than normal is what?
A) 6 ft on cover
B) 12 ft on cover
C) 18 ft on center
D) 24 ft on center

A

C) 18 ft on center

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12
Q

Guardrails or tie offs on platforms, what is the minimum height?
A) 30 inches
B) 36 inches
C) 42 inches
D) 48 inches

A

C) 42 inches

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13
Q

What do you put at each end of ceiling beams?
A) bar chair
B) step chair
C) chairs
D) support steps

A

A) bar chair

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14
Q

How many days to achieve comprehensive strength in concrete does it take?
A) 3
B) 10
C) 14
D) 28

A

D) 28

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15
Q

After concrete wall is complete, when do you backfill?
A) 28 days cold or hot
B) 3 days
C) 7 days warm temp
D) 7 days cold temp

A

C) 7 days warm temp

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16
Q

What is the temperature inside of a concrete slab? (curing process)
A) 40-50
B) 50-70
C) 75-90
D) 80-95

A

B) 50-70

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17
Q

Best grade of plywood for concrete forms?
A) B-B
B) A-C
C) HDO ply
D) MDO ply

A

C) HDO ply

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18
Q

When a contractor sends a crew out to do an excavating job and an inspector is on site, the following are true except,
A) call before you dig
B) written documents on site
C) remove hazardous
D) markings complete

A

B) written documents on site

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19
Q

What is the drop in a 10’ run with a 2% slope?
A) 2’5”
B) 2 ft
C) 3”
D) 4”

A

B) 2 ft

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20
Q

After concrete slab is poured what is the variation of temperature UNDER slab that concrete will start to crack?
A) 9%
B) 10%
C) 15%
D) 25%

A

C) 15%

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21
Q

How many workers are allowed on one safety line?
A) 1
B) 2
C) 3
D) 4

A

A) 1

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22
Q

What happens when you pour concrete directly on the forms?
A) causes forms to become weak
B) exposes aggregate
C) weakens shoring members
D) none of the above

A

B) exposes aggregate

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23
Q

What is the PSI for #11 steel rebar?
A) 40,000
B) 50,000
C) 30,000
D) 60,000

A

D) 60,000

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24
Q

When ordering concrete who is to specify if fly ash will go into concrete?
A) engineer
B) construction company
C) person ordering
D) drive

A

A) engineer

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25
Q

When building a concrete building what kind of metal is continually inspected?
A) wire mesh
B) V cut
C) hard metal
D) rebar

A

D) rebar

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26
Q

Who can make changes in ordering concrete?
A) worker at plant
B) engineer
C) contractor or person he selects
D) on one

A

C) contractor or person he selects

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27
Q

Using wire mesh in a slab will do what?
A) prevent cracking
B) nothing
C) reduce tensile strength
D) increase tensile strength

A

A) prevent cracking

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28
Q

According to OSHA fall protection is required above what height?
A) 6’
B) 8’
C) 10’
D) 12’

A

A) 6’

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29
Q

The kind of nails should you use when nailing forms together, but are easily removed?
A) double head/duplex
B) common
C) finishing nails
D) box nails

A

A) double head/duplex

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30
Q

How deep must a trench be before shoring or stepped back?
A) 5’
B) 6’
C) 8’
D) 12’

A

A) 5’

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31
Q

Which type of form is used for tall towers, silos, elevator shafts on tall buildings, and building walls?
A) slip forms
B) jump forms
C) gang forms
D) tunnel forms

A

A) slip forms

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32
Q

Of the five basic types of Portland cement, which is high-early strength cement?
A) Type I
B) Type II
C) Type III
D) Type IV

A

C) Type III

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33
Q

What is the best material to place concrete on?
A) solid rock
B) crushed rock
C) sand
D) dirt

A

A) solid rock

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34
Q

When using a portable ladder how far out a trench or above any surface must a ladder extend?
A) 1’
B) 2’
C) 3’
D) 5’

A

C) 3’

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35
Q

On a 28’ ladder, how far from the wall must base be?
A) 3’
B) 4’
C) 6’
D) 7’

A

D) 7’

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36
Q

Where is WWF used in concrete slabs?
A) at bottom for tensile strength
B) at top to control cracking
C) at top for tensile and structural
D) none of the above

A

B) at top to control cracking

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37
Q

What are the markings on rebar?
A) mil, bar, size, steel type, grade
B) grade, steel type, bar size, mil
C) bar size, steel type, grade, mil
D) steel type, grade, bar size, mil

A

A) mil, bar, size, steel type, grade

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38
Q

What is the purpose of using deformed bars in concrete?
A) better bond with concrete
B) no difference
C) not recommended
D) cost efficient

A

A) better bond with concrete

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39
Q

How long can ready mix concrete sit in a truck before it should be used?
A) 1 hour
B) 1 1/2 hours
C) 2 hrs
D) 3 hrs

A

B) 1 1/2 hours

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40
Q

How long is it recommended before forms can be stripped from sides of beams and girders in absence of engineer?
A) 5 hrs
B) 24 hrs
C) 12 hrs anytime
D) 12 hours consecutive time when temperature above 50 degrees

A

D) 12 hours consecutive time when temperature above 50 degrees

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41
Q

What is the minimum size for exposed aggregate?
A) 1/2 “
B) 3/4”
C) 1”
D) 1 1/2”

A

A) 1/2 “

42
Q

What is the distance for non or low reinforcing slabs?
A) 5 to 10
B) 10 to 15
C) 12 to 25
D) 20 to 30

A

C) 12 to 25

43
Q

When are forms affected most at a sustained temperature?
A) below 32
B) below 50
C) over 90
D) over 100

A

A) below 32

44
Q

What is a rebar chair used for?
A) horizontal
B) vertical
C) bottom of footing to keep off rust
D) to hold reinforcing bars the specified distance from the inside surface of the form

A

D) to hold reinforcing bars the specified distance from the inside surface of the form

45
Q

What is not a component of a safety line?
A) harness
B) pulley
C) bolts
D) bungy cord

A

C) bolts

46
Q

On a beam on a suspended floor where should the saw be cut?
A) middle
B) middle third
C) middle quarter
D) north edge

A

B) middle third

47
Q

When excavating a basement and water persists, which is the best for eliminating water?
A) trench box
B) trench around outside
C) trench through middle
D) well point

A

D) well point

48
Q

When water proofing a wall, what is the minimum height past the water table you must go?
A) 4”
B) 6”
C) 8”
D) 12”

A

D) 12”

49
Q

Which is the recommended lumber for forming?
A) treated
B) kin dried
C) partially seasoned
D) S and S lumber

A

C) partially seasoned

50
Q

What is the best concrete to pump through a 5” line?
A) 4” slump, air entrained with fly ash
B) 6” slump, air entrained without fly ash
C) 4” slump, air entrained without fly ash
D) 6” slump, air entrained with fly ash

A

A) 4” slump, air entrained with fly ash

51
Q

What is the best waterstop?
A) steel
B) pvc
C) rubber
D) none of the above

A

B) pvc

52
Q

Which of the following soil types proved excellent bearing for most foundations?
A) gravel mixed with sand or clay (hardpan)
B) sand and silt (compacted loam)
C) clay
D) dry sand

A

A) gravel mixed with sand or clay (hardpan)

53
Q

If you add superplasticizers instead of water to concrete it will do what?
A) increases slump temporarily
B) decrease your slump
C) lowers strength
D) all of the above

A

A) increases slump temporarily

54
Q

At what distance should equipment be stored from an open trench?
A) 4’
B) 6’
C) 2’
D) 1’

A

C) 2’

55
Q

What aggregate is best for pumping concrete?
A) crushed stone
B) rounded stone/ river rock
C) sharp rocks
D) none of the above

A

B) rounded stone/ river rock

56
Q

Oversanded mixes or mixes with very fine sands require what?
A) more water and may be sticky and hard to finish
B) less water and may be easier to finish
C) more sand
D) none of the above

A

A) more water and may be sticky and hard to finish

57
Q

A retarder often causes what?
A) a reduction in early strength
B) an increase in early strength
C) nothing
D) pliability

A

A) a reduction in early strength

58
Q

If shrinkage is a concern, a __ cement factor and __ aggregate should be used.
A) higher/lower
B) lower/higher
C) lower/larger
D) damp/dry

A

C) lower/larger

59
Q

Fly ash can generally what?
A) improve workability
B) improve pumpability
C) improve finishability and sulfate resistance
D) all of the above

A

D) all of the above

60
Q

Unpredictable or spotty set promotes what?
A) blisters
B) delamination of machine troweled slabs
C) A and B
D) none of the above

A

C) A and B

61
Q

In addition to cooling, much of the effect of high temp, on strength and setting time can be offset by using a ___ cement with retarder or fly ash.
A) Type I
B) Type II
C) Type III
D) Type IV

A

B) Type II

62
Q

Where a structure or the soil conditions would require an excessive spread of the footing base to carry the load, what are used?
A) drilled piers
B) driven piles
C) a and b
D) none of the above

A

C) a and b

63
Q

Waterstops are strips of what?
A) metal
B) rubber
C) plastic
D) all of the above

A

D) all of the above

64
Q

Basement walls depend on what?
A) first floor framing to help brace the top edge
B) shoring
C) rebar
D) footing

A

A) first floor framing to help brace the top edge

65
Q

Then usual safety factor in form work design/eng is what?
A) 2:1
B) 1:2
C) 3:1
D) 1:3

A

A) 2:1

66
Q

The min. safety factor in form work design/engineering including live loads and impact is;
A) 3:1
B) 2:1
C) 1:3
D) 1:2

A

A) 3:1

67
Q

The minimum safety factor in form work design and engineering is __ for from hangers
A) 1:2
B) 2:1
C) 1:3
D) 3:1

A

B) 2:1

68
Q

The best time to strip plastic lined forms is __ hours after the concrete is placed
A) 24
B) 48
C) 72
D) 12

A

A) 24

69
Q

One of the primary uses of welded wire reinforcement is to allow what?
A) flow
B) backflow
C) air entrainment
D) extended control joint spacing in flatwork

A

D) extended control joint spacing in flatwork

70
Q

The construction joint in a structural member must maintain bond between what?
A) the two concrete placement and not interrupt the reinforcement
B) the rebar
C) the joists
D) the forms

A

A) the two concrete placement and not interrupt the reinforcement

71
Q

An isolation joint is used at any location where a wall __.
A) ends
B) starts
C) bends
D) meets a slab or independent wall

A

D) meets a slab or independent wall

72
Q

Horizontal construction joints general practice is to limit concrete placement to what?
A) one story
B) two story
C) 20’
D) 40’

A

A) one story

73
Q

Vertical construction joints in walls can nearly always be located where?
A) corners, edges of pilaster columns
B) middle
C) top and button
D) not allowed

A

A) corners, edges of pilaster columns

74
Q

In an unreinforced wall, it is wise to place at least three smooth __ at the joint to align the sections of the wall.
A) 1/4 inch dowels
B) 1 inch dowels
C) 2 inch dowels
D) 1/2 inch dowels

A

D) 1/2 inch dowels

75
Q

What are the longitudinal joints installed in pavement slabs to control cracking caused by temp. changes
A) control joints
B) isolation joints
C) construction joints
D) warping joints

A

D) warping joints

76
Q

Planned cracks at contraction joints are induced by cutting into the slab to a depth of __ the slab thickness, or a min of __
A) 1/4 2”
B) 1/2 2”
C) 1/4 1”
D) 2 times 1/4”

A

D) 2 times 1/4”

77
Q

Dampproofing beneath a concrete slab should be a min. of __ mil
A) 10
B) 8
C) 6
D) 4

A

C) 6

78
Q

A common guideline for spacing contraction joints is to space them in feet aprox. __ times the slab depth in inches
A) 1 1/2
B) 3
C) 2
D) 2 1/2

A

D) 2 1/2

79
Q

Air entrainment causes what concrete field problem?
A) surface voids
B) blistering
C) crazing
D) puttingh

A

A) surface voids

80
Q

MIn. PSI concrete steps exposed to moderate weather?
A) 1000
B) 2500
C) 3000
D) 3500

A

C) 3000

81
Q

How much does a 8x8x16 cinder block weigh?
A) 28 lbs
B) 32 lbs
C) 36 lbs
D) 26 lbs

A

A) 28 lbs

82
Q

What is the max. time for a concrete truck to get to a jobsite?
A) 1/2 hour
B) 1 hour
C) 1 1/2 hours
D) 2 hours

A

C) 1 1/2 hours

83
Q

When the total quantity of concrete is less than __ , strength tests are not required, when evidence of satisfactory strength is submitted and approved by the building official?
A) 50 yards
B) 25 yards
C) 75 yards
D) 100 yards

A

A) 50 yards

84
Q

The ground water table is to be min. __ below the foundation?
A) 5 ft
B) 10 ft
C) 2 ft
D) 3 ft

A

A) 5 ft

85
Q

When air entrainment is added to concrete, it could produce?
A) Crazing
B) Blistering
C) Scale
D) none of these

A

C) Scale

86
Q

Steel mesh in concrete is added?
A) Near the top
B) Near the bottom to prevent surface cracks
C) in the center for structural integrity
D) to the bottom to resist tensile forces

A

D) to the bottom to resist tensile forces

87
Q

When anchors are stressed, it is allowed to have its sleeve peeled back how much?
A) not allowed
B) to not impair tensile strength
C) 25%
D) 40%

A

B) to not impair tensile strength

88
Q

WHen can you remove form boards when an engineer does not provide a time?
A) 8 hours
B) 12 hours
C) 16 hours
D) 24 hours

A

B) 12 hours

89
Q

What is sand ratio in concrete?
A) 1 part cement, 2 parts sand, 4 parts aggregate
B) 2 parts cement, 1 part sand, 4 parts aggregate
C) 4 part cement, 2 parts sand, 2 parts aggregate
D) none of the above

A

A) 1 part cement, 2 parts sand, 4 parts aggregate

90
Q

How much strength does concrete have to have before you can stretch tendons?
A) 25
B) 50
C) 75
D) none

A

C) 75

91
Q

What is recommended protrusion of a tendon?
A) 12”
B) 15”
C) 20”
D) 6”

A

A) 12”

92
Q

Placement drawings are for?
A) location for steel bars in concrete
B) location of trusses
C) location of steel placement
D) none

A

A) location for steel bars in concrete

93
Q

Cement lap siding for exterior walls shall be __ thick?
A) 0.25
B) 0.40
C) 0.10
D) 0.35

A

A) 0.25

94
Q

What is the verification of prestressed tendons?
A) periodic
B) continuous
C) welding chart
D) none of these

A

A) periodic

95
Q

What is done to make pumping of concrete easier?
A) reduced sand content
B) add plasticizers
C) none of these
D) increased sand and rounded aggregate

A

D) increased sand and rounded aggregate

96
Q

What is the min. reinforcement thickness for non bearing concrete walls?
A) 1”
B) 2”
C) 4”
D) 6”

A

C) 4”

97
Q

What is the min. distance between anchors on foundation plates?
A) 2”
B) 4”
C) 6”
D) 8”

A

C) 6”

98
Q

Min. footing depth below grade?
A) 12”
B) 8”
C) 10”
D) 18”

A

A) 12”

99
Q

Min. overlap on lap splices?
A) 2”
B) 4”
C) 6”
D) 8”

A

C) 6”

100
Q

Reinforcing deformation in steel bar surface allows for what?
A) better bond/anchorage
B) repurposing
C) strength
D) none of these

A

A) better bond/anchorage

Concrete Exam (7 decks)

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