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Concrete Exam > Test 2 > Flashcards

Test 2 Flashcards

1
Q

The percentage of coarse and fine aggregates in a typical concrete mix is approximately ____ percent.
A) 60-75
B) 25-40
C) 75-90
D) 40-60

A

A) 60-75

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2
Q

The hardening of concrete brought by the chemical reactions between cement and water is called ___.
A) Hydrosis
B) Hydration
C) Infiltration
D) Hydroxide

A

A) Hydrosis

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3
Q

Plastic shrinkage cracks on the surface of concrete during placement in hot summer weather because___.
A) Water on the surface evaporates faster than it appears on the surface from bleeding
B) Final troweling is performed too soon
C) Water content is too high
D) Forms are removed before complete curing

A

A) Water on the surface evaporates faster than it appears on the surface from bleeding

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4
Q

Concrete strength is designated in pounds per square ___.
A) Foot, tensile
B) Foot, compressive
C) Inch, tensile
D) Inch, compressive

A

D) Inch, compressive

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5
Q

Air entrained concrete___.
A) is more resistant to freezing and thawing
B) is more watertight
C) is less workable when placing
D) requires more water for mixing

A

A) is more resistant to freezing and thawing

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6
Q

To increase the water tightness of concrete____.
A) increase porportion of coarse aggregate
B) prevent any air entrainment
C) increase the water-cement ratio and curing period
D) reduce the water-cement ratio

A

D) reduce the water-cement ratio

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7
Q

Acid used to clean dried mortar from masonry is ___
NOTE: Also called “hydrochloric acid”
A) Sulphuric
B) Oxcalic
C) Muriatic
D) Ammonia

A

C) Muriatic

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8
Q

The portland cement recommended for use in large piers, heavy abutments and heavy retaining walls when the concrete is placed in warm weather is designated as ___.
A) Type IV
B) Type VI
C) Type III
D) Type II

A

D) Type II

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9
Q

When is type III portland cement used in a concrete mix?
A) For general all purpose use
B) With high sulfate content in soil or ground water
C) With low heat or hydration requirements
D) When high early strength is required

A

D) When high early strength is required

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10
Q

___ size aggregate is recommended for concrete mixtures.
A) 3/8” to 1”
B) 3/8” to 3/4”
C) 3/8” to 1/6”
D) 3/8” to 1 1/2”

A

B) 3/8” to 3/4”

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11
Q

Superplasticizers as concrete admixtures ____
A) decrease the porosity
B) decrease the water requirements and increase the workability
C) increase the durability and decrease the slump
D) increase the water requirements and increase the workability

A

B) decrease the water requirements and increase the workability

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12
Q

Which of the following is a test for the consistency and workability of concrete?
A) Slump test
B) Compression test
C) Water ratio test
D) Cylinder test

A

A) slump test

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13
Q

The placement of concrete from free fall heights exceeding 5 feet may cause ___
A) Segregation
B) Hydration
C) Consolidation
D) Beneficiation

A

A) Segregation

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14
Q

What is the maximum slump when using a vibratory screed?
A) 2”
B) 6”
C) 3”
D) 5”

A

C) 3”

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15
Q

Of the following the purpose of bullfloating a newly placed concrete slab is to ___
A) Change the color of a concrete surface
B) Embed large aggregates and level the concrete surface
C) bring large aggregates to the surface
D) remove excess water form the concrete

A

B) Embed large aggregates and level the concrete surface

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16
Q

A year later the concrete is spalling and cracking, what is the probable cause?
A) Overworking of concrete
B) too much water
C) waiting to long to screed
D) aggregates

A

A) Overworking of concrete

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17
Q

The overworking of concrete during the finishing process may cause ___.
A) spalling
B) entrainment
C) heat transference
D) hyrdration

A

A) spalling

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18
Q

When finishing a concrete slab, edging is performed after which of the following?
A) screeding
B) handfloating
C) bullfloating
D) troweling

A

C) bullfloating

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19
Q

Troweling of a newly placed concrete slab should be done immediately after ___.
A) bullfloating
B) hand floating
C) screeding
D) hand spreading

A

B) hand floating

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20
Q

The type of joint used in concrete construction which allows movement vertically and horizontally is known as a(n) ___ joint.
A) isolation
B) constructuion
C) control
D) Kerfed joint

A

A) isolation

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21
Q

According to design and control of Concrete Mixtures, what is the minimum depth of a control joint in concrete slabs?
A) 1/2 inch
B) 1/8 inch of the thickness of the slab
C) 1/4 inch of the thickness of the slab
D) 1/2 inch of the thickness of the slab

A

C) 1/4 inch of the thickness of the slab

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22
Q

When repairing concrete or masonry, all of the following are done except__
A) glazing
B) patching
C) cleaning
D) finishing

A

A) glazing

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23
Q

When finishing concrete, the movement of water to the top surface is called___
A) bleeding
B) efflorescence
C) bonding
D) laitance

A

A) bleeding

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24
Q

Which of the following is not recommended during hot weather?
A) decrease cement in the mortar
B) place ice in the mortar
C) store mortar in the shade
D) mix mortar in small batches

A

A) decrease cement in the mortar

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25
Q

The method used for the slump test of fresh concrete requires that the cone be filled in___ equal layers. The slump test will determine the consistency and workability of concrete.
A) 5
B) 2
C) 3
D) 4

A

C) 3

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26
Q

Which of the following tests for hardened concrete are not performed in the field?
A) penetration
B) pullout
C) compression
D) rebound

A

C) compression

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27
Q

How many concrete test cylinders shall be required if the compression test fails?
A) 1
B) 2
C) 3
D) 4

A

C) 3

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28
Q

Full compaction of soil is obtained by having the proper ___ content.
A) gravel
B) clay
C) sand
D) moisture

A

D) moisture

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29
Q

What piece of equipment is most often used in placing concrete under water?
A) conveyor
B) tremie
C) concrete pop
D) drop chute

A

B) tremie

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30
Q

Solid masonry or concrete retaining walls require ___ to eliminate build up of hydrostatic pressure.
A) mortar
B) footings
C) weepholes
D) deadmen

A

C) weepholes

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31
Q

Which saw blade cuts faster?
A) Diamond chip
B) Abrasive garnet
C) carborundum
D) carbon steel

A

A) Diamond chip

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32
Q

The primary advantage of using masonry block in the construction of walls is___
A) they are stronger than reinforced concrete walls
B) because steel reinforcement is easily placed
C) they serve as a better bonding agent to veneer applications
D) the units are lightweight and easily lifted into place

A

D) the units are lightweight and easily lifted into place

33
Q

The type of mason’s line preferred by concrete and masonry workers is ___ since it can tolerate a great deal of strain.
A) hemp
B) linen
C) nylon
D) cotton

A

C) nylon

34
Q

What type of saw blade is used when not wet cutting?
A) masonry saw
B) diamond chip
C) non abrasive garnet
D) abrasive garnet

A

D) abrasive garnet

35
Q

The type of drill bit used to bore dry holes in hardened concrete is a ___
A) diamond chip
B) high speed metal
C) silicone carbide
D) carbide tip

A

C) silicone carbide

36
Q

Arches that are constructed of brick require Type ___ cement used in the mortar mix.
A) II
B) V
C) IV
D) I

A

D) I

37
Q

The three types of strength to consider in mortar are: bond, compressive and ___
A) tensile
B) expansive
C) torsion
D) hydraulic

A

A) tensile

38
Q

When using mortar that contains too little sand, which of the following problems is likely to occur?
A) Shrinkage cracks
B) calcining
C) staining
D) moisture absorption

A

A) Shrinkage cracks

39
Q

A white powder that forms on the outside of masonry walls is called ___
A) salt glaze
B) laitance
C) efflorescence
D) bleeding

A

C) efflorescence

40
Q

Efflorescence may be removed by ___
A) washing with water diluted hydrochloric acid
B) light sandblasting or stiff bristled brush
C) exposing to sunlight
D) paint thinner

A

A) washing with water diluted hydrochloric acid

41
Q

The correct method of remixing mortar that has a thin (watery) consistency is to add ___
A) more sand to the mix
B) the same proportions to the mix (excluding water)
C) more lime to the mix
D) more cement to the mix

A

B) the same proportions to the mix (excluding water)

42
Q

What do you tie a wood fence to a masonry veneer wall with?
A) lag bolt
B) anchor bolt
C) expansion shield and bolt
D) grout

A

B) anchor bolt

43
Q

What is the most important characteristic of masonry mortar?
A) tensile strength
B) bonding strength
C) compressive
D) durability

A

B) bonding strength

44
Q

What type of tie is used to tie 1 1/2 inch thick masonry veneer to a wood frame wall?
A) adjustable tie
B) corrugated tie
C) galvanized tie
D) flexible tie

A

B) corrugated tie

45
Q

What is the heat given off while concrete is curing?
A) hydration
B) spalling
C) thermal
D) heat transference

A

A) hydration

46
Q

What is the term used for wire mesh used before pouring concrete?
A) wire lath
B) welded wire fabric
C) hardware cloth
D) rebar

A

B) welded wire fabric

47
Q

When using hydrochloric acid as a cleaning agent for new masonry, ____.
A) thoroughly rinse wall with water after scrubbing with acid
B) one part acid should be mixed with one part water
C) use only on dark bricks
D) the acid should be diluted

A

A) thoroughly rinse wall with water after scrubbing with acid

48
Q

What is a bond beam used for?
A) a support beam
B) a horizontal reinforced concrete masonry beam designed to reduce probability of cracking
C) a vertical and horizontal reinforced concrete masonry beam designed to reduce probability of cracking
D) a vertical reinforced concrete masonry beam designed to reduce probability of cracking

A

B) a horizontal reinforced concrete masonry beam designed to reduce probability of cracking

49
Q

What is the term for the process of applying mortar to a masonry unit with a trowel?
A) parging
B) sacking
C) pointing
D) buttering

A

D) buttering

50
Q

Troweling mortar into a joint after the masonry units are laid is called__
A) capping
B) bedding
C) raking
D) pointing

A

D) pointing

51
Q

A “reglet’ (Raggle or Raglet) is used ___
A) as a floor drain
B) to prevent leaks where flashing is applied to a wall
C) for decorative purposes only
D) in the same name as a scupper

A

B) to prevent leaks where flashing is applied to a wall

52
Q

The color code of grounding wire in an electrical circuit for a concrete pumping unit is __
A) orange
B) green or bare copper
C) white and gray
D) black

A

B) green or bare copper

53
Q

When applying a hot bituminous membrane, the inside and outside corners of the waterproofed surface should be reinforced with___
A) two 12” plies of reinforcing material, centered on the corners
B) nothing reinforcement is not required
C) an additional layer of membrane, 12” wide, centered on the corners
D) fiberglass reinforced tape

A

A) two 12” plies of reinforcing material, centered on the corners

54
Q

Hand finished concrete decks around a residential swimming pool shall have a minimum slope of __ inch per foot.
A) 3/16
B) 1/16
C) 1/8
D) 1/4

A

C) 1/8

55
Q

On a 24 inch saw blade, the cutting diameter in concrete would be __ inches
A) 24
B) 16
C) 12
D) 9

A

D) 9

56
Q

The unsupported height of masonry piers shall not exceed ___ their last dimension
A) 12 times
B) 3 times
C) 10 times
D) 5 times

A

C) 10 times

57
Q

math stuff

A

math

58
Q

A 30 foot driveway with a 5% slope rises __ inches from one end to the other.
SOL since grade=Rise, Rise= GradeXRun
A) 24
B) 12
C) 18
D) 10

A

C) 18

59
Q

When picking up a bundle of rebar with two chokers, which way should they be hooked?
A) the eyes facing the same direction
B) the eyes are looking in the opposite direction
C) the eyes are closed
D) the eyes are facing to the left

A

A) the eyes facing the same direction

60
Q

In a multistory building, you finish a floor, what do you need to do to that floor before you go to the next floor above?
A) prime it
B) shoring
C) mop it
D) buff it

A

B) shoring

61
Q

According to OSHA, a contractor must comply with all safety and health provisions except which one?
A) frequently inspect the job site and equipment
B) requiring each employee to understand all construction site safety and health procedures
C) initiating and maintaining accident prevention programs
D) permit only trained and qualified employees to operate equipment and machinery

A

B) requiring each employee to understand all construction site safety and health procedures

62
Q

An employee, while performing a concrete sawing operation in a confined space would be exposed to airborne concrete dust. According to OSHA, what is the minimum respiratory protection required?
A) a full face respirator with appropriate filter
B) a air purifying respirator with a filter pad of cartage
C) paper filter mask
D) a self contained breathing apparatus

A

A) a full face respirator with appropriate filter

63
Q

FAA construction standards, what is the minimum flexural straight allowed for concrete airport pavements?
A) 1,000 psi
B) 4000 psi
C) 8,000 psi
D) 6,000 psi

A

D) 6,000 psi

64
Q

What is the minimum amount of cement per cubic yard dealing with precast concrete?
A) 450 lb
B) 440 lb
C) 460 lb
D) 470 lb

A

D) 470 lb

65
Q

How often do you check a first aid kit?
A) weekly
B) monthly
C) daily
D) yearly

A

A) weekly

66
Q

When there are rock pockets on concrete what type of finish uses 1 part cement and 2 parts fine sand?
A) class I
B) class IIII
C) class III
D) class II

A

A) class I

67
Q

What finish would you use on a concrete bridge pier that will be backfield.
A) class II
B) class IV
C) class III
D) class I

A

D) class I
would use class II if pier is going to be exposed

68
Q

What does fiber reinforced concrete do?
A) increases the resistance to cracking
B) able to form patterns
C) never used
D) improve concrete flexural strength

A

A) increases the resistance to cracking

69
Q

Air entrained concrete is mainly used to __
A) a section of ground that needs to be filled
B) increase tensile strength
C) reduce drying and curing time
D) reduce damage by freeze thaw cycles

A

D) reduce damage by freeze thaw cycles

70
Q

What kind of concrete is to be used in high sulfur area?
A) Type V
B) Type III
C) Type I
D) Type II

A

A) Type V

71
Q

What type of concrete do you use if you’re repairing a small section of highway and need it to be strong in a short period of time?
A) type IS
B) type s
C) type III
D) type IV

A

C) type III

72
Q

Aggregate makes up __ of concrete volume
A) 60% to 75%
B) 75% to 85%
C) 20% to 45%
D) 45% to 60%

A

A) 60% to 75%

73
Q

Bridge concrete mix that contains superplasticizer will
A) require less water for the same workability
B) require more water for the same workability
C) none
D) be resistant to spilling

A

A) require less water for the same workability

74
Q

Which of the following is not a basic test used in concrete mix design and quality control?
A) density
B) air content
C) compressive strength
D) slump

A

A) density

75
Q

FAA construction standards a bituminous mix used on an airport runway shall be placed and compacted at a temperature not less than?
A) 230* F
B) 190* F
C) 250* F
D) 210* F

A

C) 250* F

76
Q

What do you use to clean concrete?
A) muratic acid
B) sand blaster
C) gas
D) water

A

A) muratic acid

77
Q

How high in a seismic zone can you install a prefabed wall on wooden studs?
A) 30’
B) 10’
C) 20’
D) 15’

A

A) 30’

78
Q

Which of the following measurements would work to determine 90* corner?
A) 3,4,5
B) 4,8,12
C) 1,2,3
D) 8,12,16

A

A) 3,4,5

Concrete Exam (7 decks)

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