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CSLB Trade > Concrete > Flashcards

Concrete Flashcards

1
Q

Which of the different types of cement is best to use in concrete when the soil has a high alkali content

A

type V

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2
Q

the minimum thickness of a concrete non-bearing tilt-up wall is:

A

4 inches

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3
Q

when erecting precast concrete walls, the bracing used to hold the walls in place shall be designed to withstand a wind load of at least:

A

10 lbs per sq ft

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4
Q

Portland cement is a manufactured cement. The name portland is not a brand name; it refers to a type of cement. (T/F)

A

True

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5
Q

a retaining and breast wall are the same (T/F)

A

True

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6
Q

which of the following cements is most commonly used in masonry units

A

Type I

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7
Q

What is an accumulation of fine particles on the surface of freshly painted concrete caused by an upward movement of water through the concrete called?

A

Laitance

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8
Q

The type of construction where columns are used and concrete is poured as a slab and lifted into place to form the walls is know as tilty up or tilt slab construction(T/F)

A

True

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9
Q

For a three story building, how thick is the foundation wall for a concrete foundation, in accordance with the code?

A

10”

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10
Q

for a single story building, how wide is the footing for a unit masonry foundation, in accordance with the code

A

12”

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11
Q

for a two story building, how thick is the thickness of the footing, in accordance with the code

A

7”

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12
Q

for a two story building, how deep in the soil must the base of the footing be, in accordance with the code?

A

18”

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13
Q

For a two story building, how wide is the foundation wall, in accordance with the code?

A

8”

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14
Q

Space holder

A
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15
Q

for a single story building, how deep in the soil is the base of the foundation

A

12”

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16
Q

for a three story building, how deep in the soil is the base of the foundation?

A

24”

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17
Q

space holder

A
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18
Q

which type of float should be used on air entrained concrete

A

aluminim

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19
Q

if a #5 rebar is overlapped 32 bar diameters, what is the total length of the splice?

A

20”

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20
Q

a saddle tie is used for

A

cross tie rebar

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21
Q

unless a curing compound is used, the number of days recommended for the moist curing of concrete is:

A

7

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22
Q

vibrating the concrete durring placement is useful for

A

consolidation only

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23
Q

which of the following concrete joints allows both verticle and horizontal movement of a slab

A

isolation

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24
Q

which of the following will achieve highest water tightness in concret

A

water/cement ratio should be as low as possible

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25
Q

which of the following causes plastic shrinkage cracks in concrete

A

rapid drying of the concrete at the slab surface

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26
Q

In order for the visible section of concrete tie to be broken off after pouring a concrete wall, the tie is manufactured with what type of special feature

A

breakoff

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27
Q

what is the minimum thickness of a concrete floor slab supported directly on the ground, according to the code

A

3-1/2”

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28
Q

which of the following additives is used to accelerate concrete curring?

A

calcium chloride

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29
Q

how soon should curing commence after finishing a concrete slab

A

immediately

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30
Q

air-entrained concrete requires which of the following

A

less mixing water

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31
Q

air-entrained concrete is used primarily to provide which of hte following results

A

improve resistance to freezing and thawing deterioration

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32
Q

what is a flat steel tool, of different sizes and shapes used to spread and smotth plaster, mortat or concret called

A

a trowel

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33
Q

the maximum allowable size of coarse aggregate in a concrete slab is ____, according to the code.

A

1/3 the slab thickness

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34
Q

the purpose of bull floating or darbying is to

A

embed the larger agregate and level the surfce

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35
Q

which of the following designates concrete strength

A

pounds per square inch compressing

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36
Q

a paste is formed when portland cement is mixed with water making a chemical reaction take place that is called

A

hydration

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37
Q

Dampening of wood concrete forms before placement will

A

prevent the rapid extraction of mixing water

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38
Q

when concrete foundations or grade beams and floors are poured in one single operation, it is reffered to as what type of pour

A

monolithic

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39
Q

The normal portland cement used in pavement and sidewalk construction as well as reinforced concrete buildings is

A

type 1

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40
Q

which of the following types of portland cement is used where concrete is subject to exposure to water or soil of high alkali or sulphate content

A

type V

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41
Q

when high strength is desired at an early period of cure, which type of portland cement is used

A

type III

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42
Q

what is the wood or metal straightedge used to strike off or level newly placed concrete called?

A

a screed

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43
Q

in concrete flatwork, what is a flat tool used as a smoothing device immediatley after screeding called

A

a darby

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44
Q

what is the trademark for a construction material composed of cement, snad or crusehd slag and water mixed together and forced through a cement gun by a pneumatic pressure

A

gunite

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45
Q

portland cement is manufactured from

A

lime
silica
aluminia

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46
Q

portland cement is kilned at

A

2700 degrees F

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47
Q

Sand is classified as fine aggregate. Fine aggregate used in concrete should be able to pass through a seive number

A

4

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48
Q

aggregate having a density of ____ pcf or less is known as lightweight aggregate

A

70

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49
Q

sand that is used in concrete is called

A

fine aggregate

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50
Q

which tool is usually used to finish lightweight concrete

A

bull float or darby

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51
Q

what is the primary ingredient of pertland cement

A

lime

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52
Q

what ingredients constitute the cement paste portion of concrete

A

cement, air, water

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53
Q

when cement and water combine, the chemical reaction is known as hydration. This process produces

A

heat

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54
Q

the most commonly used type of cement is

A

type1

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55
Q

cement sets and hardens due to the chemical reaction called

A

hydration

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56
Q

what is the main use in construction of portland-pozzolan cement

A

large hydralic structures

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57
Q

it is necessary to take precautions to protect the skin from direct contact with fresh concrete. not doing so may result in:

A

painful burns

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58
Q

what is the most common form of fine aggregate

A

sand

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59
Q

Of what materials are the best aggregates composed of

A

hard and durable

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60
Q

aggregates for concrete are separated into what two general sizes

A

coarse and fine

61
Q

aggregates for concrete should be sound and durable. waht are two desirable characteristics

A

well graded and clean

62
Q

aggregates comprise approximately ____ to ____ percent of the total volume of a concrete mix

A

60
75

63
Q

what is the minimum particle size for coarse aggregates

A

1/4 inch

64
Q

what are some qualities of water that usually make it satisfactory for making concrete without testing it

A

drinkable and no objectionable odeor
temperature below 90 degrees f
temperature above 40 degrees f

65
Q

the proper time to put the final finish on concrete is

A

after the bleed water has left the surface

66
Q

curring of concrete is necessary because of which of the following

A

keeps moisture in the concrete so that it develops its full strength

67
Q

about ____ pounds of water are required to completely hydrate 100 pounds of cement

A

30

68
Q

after all materials are charged into the truck mixer, the drum should be rotated at mixing speed for completion of mixing under normal conditions what are the maximum minimum revolutions commonly used in specifications

A

70 to 100

69
Q

the compressive strength of a molded test cylinder at ____ after placement is the standard for specifying concrete strength

A

28 days

70
Q

How many minutes should be allowed for mixing 3 cu yd batch of concrete mixer after all the materials have been placed in the mixer

A

1.5 minutes
1 min first yard 15 seconds for each extra yard

71
Q

what must be taken into consideration regarding the method used for conveying concrete from the mixer to the place of final deposit on the job

A

prevent separation of the concrete materials

72
Q

concrete should be placed in forms at a temperature of approximately

A

50 to 70 degrees

73
Q

how long after placement should normal concrete be kept moist

A

5 days

74
Q

the strength of concrete is in direct relationship to the proportions of water and cement. This is referred to as the ____ ratio.

A

water/cement

75
Q

hot weather affects concrete in which of the following ways

A

-increased water demand
-faster rate of setting
-increased slump lost

76
Q

the test for consistency of a concrete mix is called

A

slump test

77
Q

how many inches high is a standard slump cone mold

A

12

78
Q

when starting the slump test, the slump cone should be

A

damp

79
Q

the most important factor of wooden forms is

A

the size should be correct and the forms should be even

80
Q

the type of footing that is sunk deepest is:

A

Spread footing

81
Q

Which of the materials requires the use of a form sealer

A

wood

82
Q

the proper procedure for preparing steel forms prior to pouring is to

A

oil them

83
Q

the minimum thickness of a plain concrete pad poured directly on the ground is:

A

3-1/2”

84
Q

the process of pouring cement under water is called

A

tremie pouring

85
Q

which forms do not need oiling

A

cardboard

86
Q

which of the following causes compaction in concrete

A

vibration

87
Q

why should a supervisor be present when concrete is poured

A

to make sure the concrete is vibrated properly

88
Q

the term aggregate means

A

sand, stone and gravel

89
Q

when air bubbles appear next to where the form was, this is reffered to as

A

honey comb

90
Q

adding additional sand and aggregate to a normal concrete mis will

A

weaken it

91
Q

space holder

A
92
Q

in concrete an admixture is used to

A

cure faster and strengthen the mix

93
Q

the best type of footing for a single column is

A

spread footign

94
Q

which of the following is the best answer for what vibrating does to concrete

A

consolidates concrete

95
Q

a sack of prtland cement weighs

A

94 lbs

96
Q

a sack of portland cement is equal to ____ cubic feet

A

1

97
Q

the weight of reinforced concrete is approximately how many pounds per cubic foot

A

140 to 160

98
Q

the initial set in concrete should usually occur within not more than ____ of the pour

A

1 hour

99
Q

it is commonly required that concrete be poured within how many minutes after mixing

A

30 to 90 minutes

100
Q

the inside surface of forms are oiled to

A

all the form to strip easier

101
Q

rapid pouring of concrete

A

may burst the forms

102
Q

if footings are not placed below the frost line

A

the foundation will heave and crack

103
Q

spreaders for footing forms are used

A

because they maintain the footing width

104
Q

the horizontal surface of a stepped footing must be minimum of

A

twice the vertical distance

105
Q

what is the usual size of a standard wall panel

A

3 feet x 8 feet

106
Q

when you reinforce the walers at the corners with vertical 2x4s this is called

A

yoking the corners

107
Q

to guide the screeding of the top of a foundation wall

A

use the top of the form as a guide

108
Q

when erecting concrete formwork

A

use duplex nails throughout

109
Q

if using the slump test for concrete to be used in a large slab, the slump should be

A

1-4 inches

110
Q

if using the slump test for concrete to be used in a reinforced concrete wall other than thin walls, the slump should be

A

3-6 inches

111
Q

if using the slump test for concrete to be used in a thin reinforced concrete wall, the slump should be

A

4-8 inches

112
Q

normal portland cement is used whenever

A

sulfate hazards are absent

113
Q

type 2 cement is commonly refered to as

A

moderate portland cement

114
Q

cement after being ground will pass through a sieve number

A

325.

115
Q

what material does not effect concrete

A

creosote

116
Q

what type of tool is used for bonding an expansion joint

A

trowel

117
Q

which of the following materials requires the use of a form sealer

A

wood

118
Q

the proper procedure for using steel forms prior to pouring is to

A

oil them

119
Q

the typpe of concrete known as high early strength is

A

type III

120
Q

which of the following will increase the durability of concrete

A

curing

121
Q

which property of concrete increases its resistance to bending, pullout, temperature changes and freezing

A

tensile strength

122
Q

if the size of the largest aggregate in a given mix increases, what will the water and cement do

A

both decrease in ratio

123
Q

which of the following will make up for strength lost due to air

A

decrease the water/cement ratio

124
Q

he tremic process is used to

A

pour concrete under water

125
Q

when paving with cement, the layer underneath should be

A

damp

126
Q

which of the form materials do not need oiling

A

cardboard

127
Q

vertical steel bars in a concrete upright are refered to as

A

column bars

128
Q

when mixing mortar in a mechanical mixer the mixing should be completed in

A

1 minute

129
Q

there are various standards for mixing time which necessarily allow for different mixers and ingridients. The absolute minimum time to mix a batch of concrete is

A

40 seconds

130
Q

which of the following are joints used in concrete pavements

A

contraction
expansion
construction

131
Q

the bent end of an anchor bolt must extend at least ____ into the concrete (15” into masonry)

A

7”

132
Q

at lest two anchor bolts, spaced not more than ____ apart must be used for each piece of mudsill and there must be an anchor bolt within ____ of each end of each piece

A

6 ft
12 inches

133
Q

if a concrete wall (Not considering the footing) measures 8” thick x 6’8” high x 150 yards long, how many cubic yards of concrete is required to construct the wall.

A

74

134
Q

air entrained concrete has increased durability and workability. It contains approximately ____ air by volume

A

7%

135
Q

When constructing forms, the ACI 347 recommends that both vertical and horizontal framing components be designed for a minimum live load of ____ per square foot to sustain the weight of workers, runways, screeds, etc

A

50 psf

136
Q

the slump test is used to test

A

liquidity

137
Q

what is the size of a slump test

A

cone 4” top, 8” base, 12” high

138
Q

edgers should be used right after

A

bull floating or darbying

139
Q

when concreting in hot weather, one of the biggest problems is the

A

hardening too fst

140
Q

for expansion and contraction of concrete in sidewalks ____ betwenn control joints should be allowed.

A

5 to 10 feet

141
Q

on a concrete slabs what are a couple of the basic joints

A

constructio
control
isolation

142
Q

to give a smooth finish, which of the following is used

A

steel trowel

143
Q

when placing concrete, which of the following is not important

A

transportation method

144
Q

a non steel form has greater longevity if it is kept

A

oiled and clean

145
Q

which of the following is not used in a slump test

A

wood float

146
Q

test cylinder compressive strength is machine tested to the closest ____ psi

A

10

147
Q

when using entrained air, whic of the following may be reduced in concrete

A

water adn sand

148
Q

air entrained agents improve which of the following qualities of concrete?

A

expansion ability

CSLB Trade (22 decks)

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