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Dirt Boy CDC > Vol 2 > Flashcards

Vol 2 Flashcards

1
Q

If you are laying out an area for concrete, how many inches on each side should you allow for the width of the forms?

A

6 inches

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2
Q

On a centerline stake, where is the amount of earthwork to be done marked?

A

Back

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3
Q

What type of cut is made to lower the grade for the road or runway?

A

Through

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4
Q

The base course distributes wheel loads to the?

A

Subgrade

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5
Q

What two construction materials can you recycle to use for other purposes?

A

Asphalt and Concrete

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6
Q

What percentage of slightly plastic silt and clay is present in a satisfactory base course mix when added to crushed rock?

A

10%

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7
Q

What is the numerical value of π?

A

3.14

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8
Q

How many cubic feet are in 1 cubic yard?

A

27ft

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9
Q

What information must you ask the company providing base course in order to get an exact amount of base course for your project?

A

The exact weight of their material.

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10
Q

To compensate for low spots in the subgrade when you are computing base course materials, what percentage of the computed volume should you add to your order?

A

5%

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11
Q

What is directly or indirectly responsible for most pavement failures and deterioration?

A

Water

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12
Q

Storm drains should not be used except where the slope of the ground is not suited for ditches, gutters, or flumes, and where

A

Space is restricted

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13
Q

Which of these conditions is not a function of subsurface drainage?

a. To intercept seepage or underground springs.
b. To divert water away from structures.
c. To lower the water table.
d. To raise the water table.

A

To raise the water table.

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14
Q

If you are installing culverts or storm drains, the bottom of the trench should be

A

Shaped to fit the pipe.

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15
Q

What can you do if you want to funnel water into the inlet of a culvert?

A

Flare the End Walls

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16
Q

French drains are not recommended for permanent construction because they have

A

A tendency to silt up

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17
Q

You should treat the bottom of vertical dry wells with calcium chloride or hay to

A

Prevent Freezing

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18
Q

Holes in perforated pipe should be placed UP when the

A

structure is to be placed along the side of the pavement

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19
Q

After you place either your impervious soil layer or filter material for a subsurface structure, make sure the bottom of the trench is

A

Shaped to fit the pipe.

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20
Q

The purpose of a drainage inspection is to report on the

A

Condition
Function
and safety of the items inspected

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21
Q

What type of drainage inspection should you do during or immediately after a rainstorm?

A

Operational

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22
Q

When should you do a maintenance check?

A

After all water has cleared the structure.

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23
Q

What are the types of drainage defects?

A

Breaks
Erosion
Vegetation and Obstructions.

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24
Q

You should install a drop inlet at the end of a culvert to

A

Control Silting

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25
Q

What type of Portland cement is used in large masses of concrete, such as large dams?

A

IV

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26
Q

What percent of the volume of a concrete mix is aggregates?

A

60-75.

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27
Q

How many gallons per yd3 of water can be added at the jobsite without detrimental effects?

A

1-2

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28
Q

One purpose of air-entraining agents is to

A

Increase resistance to the action of chemicals

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29
Q

What is generally considered to be the third dimension in a measurement?

A

Depth

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30
Q

If the shape of your concrete project is not common, what can you do to simplify calculating the concrete you need?

A

Break the shape up into common shapes and add them together

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31
Q

What type of string should you use as a guide for setting forms?

A

Nylon

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32
Q

What holds the steel form firmly against the stake?

A

Wedges

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33
Q

If a dowel is to be placed across an expansion joint, it must be

A

Smooth

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34
Q

You can prevent wooden keyways from cracking by

A

Oiling and Grooving with a saw kerf

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35
Q

What is the purpose of using tie bars in concrete?

A

Hold slabs together

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36
Q

When installing multiple sections of welded wire fabric, how much should be overlapped?

A

6 inches

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37
Q

Footings and other principal structural members should have at least how many inches of concrete between the steel reinforcement and the ground?

A

3 inches

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38
Q

What can you do to the pile of concrete after a slump test is completed to indicate its cohesiveness, workability, and place ability?

A

Tap gently with tamping rod

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39
Q

Why must the ends of cylinders used for testing be finished carefully?

A

If not perfectly flat, the results could be skewed.

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40
Q

What is the most common mix for concrete when mixing it by hand?

A

1 part cement + 2 parts sand + 3 parts gravel

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41
Q

How long should the first cubic yard of concrete be mixed in a portable concrete mixer for a medium job?

A

1-Minute

42
Q

When a transit truck is used, the concrete should be delivered and discharged within

A

1½ hours.

43
Q

When transporting concrete, you should be careful to prevent

A

Segregation

44
Q

What is it called when large voids are visible in concrete that hasn’t been consolidated properly?

A

Honeycomb

45
Q

What is the most widely used mechanical method for consolidating concrete?

A

Vibration

46
Q

What type of joint is installed to relieve compressive stresses of a slab?

A

Expansion

47
Q

Which curing method is most effective for the prevention of mix water evaporation?

A

Water curing

48
Q

Which curing method should you not use when discoloration is objectionable?

A

Plastic Films

49
Q

When should you apply chemical membranes?

A

As soon as the concrete is finished

50
Q

What is the MOST IMPORTANT part of landscaping

A

Drainage

51
Q

You cannot conduct a walking inspection when

A

Time is a critical factor

52
Q

In what United Facilities Criteria (UFC) can the guidance concerning pavement maintenance management be found?

A

UFC 3-270-05

53
Q

What is the most common cause of cracking in concrete pavements?

A

Overloading by traffic

54
Q

The defect characterized by chipping or breaking away of concrete at joints, cracks, or edges is called

A

Spalling

55
Q

When you saw concrete for a partial-depth repair, you should adjust the blade to cut a minimum depth of

A

2-Inches

56
Q

For a partial depth concrete repair, you want to remove

A

The defective concrete only

57
Q

When should you apply bonding agents?

A

Immediately before the repair material is placed

58
Q

When performing a full-depth repair, how much material must be removed?

A

Until hard, firm soil is reached

59
Q

You should add calcium chloride to a concrete mixture to

A

Increase the concretes early strength

60
Q

What is the diameter of a random crack-saw blade?

A

5 Inches

61
Q

During crack cleaning, what serves the same purpose as brooming, but is much more efficient

A

High Pressure Air

62
Q

How much wider than the joint must the backer rod be when it is compressed into the joint

A

25%

63
Q

Today’s asphalt cements are graded according to

A

Performance Grade

64
Q

What type of asphalt emulsion has little or no ability to mix with an aggregate?

A

Rapid Setting (RS)

65
Q

Which type of asphalt emulsion is developed for slurry seals?

A

Quick-set (QS)

66
Q

Which of these materials can be used with damp aggregate?

A

Asphalt Emulsion

67
Q

Bituminous surfaces must be constructed on bases that are reasonably dry and free from

A

caked mud or dust

68
Q

Bituminous construction normally should be suspended when the temperature goes below

A

50F

69
Q

What is the purpose of a Tack Coat?

A

Acts as glue between two layers of asphalt

70
Q

What is the purpose of a Prime Coat?

A

Waterproofs the surface

71
Q

Because of environmental concerns, the best materials to be used as prime coats are

A

Emulsions

72
Q

What is the most widely used type of flexible pavement construction material?

A

Central plant mix

73
Q

Can you use the same weight of asphalt for multiple mixes when computing requirements?

A

No, asphalt weight varies by mix design.

74
Q

What shape should a load of hot mix asphalt have in the bed of a dump truck?

A

Dome

75
Q

When inspecting a truck of asphalt, blue smoke indicates the mix is

A

Burnt

76
Q

One advantage of a bituminous paver over a motor grader is that the bituminous paver

A

Saves spreading time

77
Q

Breakdown rolling is best done with

A

steel-wheeled rollers.

78
Q

Where should the breakdown rolling operation start after joints have been pinched?

A

The Low Side

79
Q

How far from the lower unsupported edge should the rolling process start for thick lift construction?

A

12-15Inches

80
Q

Under which condition would you operate the steel-wheeled roller with the tiller wheel forward?

A

The grade is excessive

81
Q

Finish rolling is done solely to

A

Improve the Surface

82
Q

What types of cracks are interconnected and form a series of small blocks resembling chicken wire?

A

Alligator

83
Q

What type of crack in flexible pavement is caused by a lack of bond between the surface layer and the course beneath?

A

Slippage

84
Q

Where do corrugations in flexible pavement normally occur?

A

At points where traffic brakes and accelerates.

85
Q

The progressive loss of surface material from flexible pavement by traffic abrasion is called

A

Raveling

86
Q

When should asphalt pavements be inspected

A

Spring and Fall

87
Q

Large cracks in pavement is repaired the same way as

A

Potholes

88
Q

Small and medium cracks in flexible pavement can be sealed individually with a

A

Prepared Joint Sealer

89
Q

What item is used to force sealing material into the cracks in flexible pavements?

A

Squeegee

90
Q

Which item should you use to mark defective flexible pavement?

A

Crayon

91
Q

As you mark an area for removal of defective flexible pavement, how far into the good pavement should you make your marks?

A

12 Inches

92
Q

When removing defective flexible pavement, you should remove base course materials until

A

you reach firm, dry material

93
Q

When should the rolling operation for pavement repair using hot-mix begin?

A

Immediately after the material is placed.

94
Q

Which of the following is not a purpose of a bituminous surface treatment?

A

Strengthen the Surface

95
Q

What should be used to seal hairline cracks in asphalt pavements?

A

Fog Sea,

96
Q

Each additional layer of aggregate for a multiple surface treatment should be about

A

one half the size of the previous layer

97
Q

One purpose of an emulsion slurry seal is to

A

prevent moisture intrusion into the pavement

98
Q

Immediately before you apply slurry, the pavement surface should be thoroughly cleaned, broomed, and

A

Moistened with a light application of water

99
Q

Road shoulders protect the basic pavement structure by giving what kind of support/

A

Lateral

100
Q

What do shoulders provide motorists?

A

An emergency lane

101
Q

What type of road shoulder exists along narrow pavements, inside curves and at intersections?

A

Dual-Type

Dirt Boy CDC (3 decks)

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