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cven 342 quiz and survey > test 2 > Flashcards

test 2 Flashcards

1
Q

Portland cement concrete paste contains:
a. water and cement
b. water, cement, and fine aggregate
c. water, cement, and coarse aggregate
d. water, cement, fine aggregate, and coarse aggregate

A

water and cement

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2
Q

Volumetric mix design for Portland cement concrete is based on:
a. adjusting the volume of fine aggregate
b. adjusting the volume of coarse aggregate
c. sufficient workability
d. 4% air

A

adjusting volume of the fine aggregate

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3
Q

Chemical admixtures are used in Portland cement concrete to:
a. reduce workability
b. increase water requirement
c. accelerate set
d. decrease durability

A

accelerate set

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4
Q

chemical admixture : air entraining class

A

improve workability, durability, decrease bleeding

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5
Q

chemical admixture class: water reducing (WR), high range WP (superplasticizer) do what at ______slump

A

prevent pc flocculation to make water more effective: improve workability, durability, strength, reduce cement at CONSTANT slump and w/c

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6
Q

Chemical admixtures are used in Portland cement concrete to:
____workability

A

increase

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7
Q

Chemical admixtures are used in Portland cement concrete to:
workability
_______water requiremen

A

reduce

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8
Q

Chemical admixtures are used in Portland cement concrete to:

_______durability

A

improve

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9
Q

Mineral admixtures are used in Portland cement concrete to:
a. increase early strength
b. increase long-term strength
c. decrease workability
d. increase porosity

A

increase long term strength

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10
Q

chemical admixtures

A

air entraining and water reducing

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11
Q

mineral admixtures

A

-improve work/pumpability
-reduces heat
-decreases bleeding
-reduces permeability
-resistance to sulfate attack , asr
-reduces cost

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12
Q

reducing permeability does what to durability

A

improves

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13
Q

One of the raw materials used to manufacture Portland cement is:
a. C4 AF
b. C3 A
c. ettringite
d. clay

A

clay

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14
Q

one of the primary reactants in hydration of Portland cement is:
a. limestone
b. monosulfoaluminate
c. C-S-H
d. C3 S

A

C3S

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15
Q

One of the primary hydration products in Portland cement concrete is:
a. CH
b. C2 S
c. gypsum
d. sandstone

A

CH

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16
Q

hydration REACTANTS

A

-C3S
C2S
C3A
C4AF
CSH2

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17
Q

hydration PRODUCTS

A

C-S-H
CH
ETTRINGITE
-MONOSULFOALUMINATE
-TETRACALCIUM ALUMINATE HYDRATE
-FERRIC ALUMINUM HYDROXIDE

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18
Q

C3S

A

tricalcium silocate

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19
Q

C2S

A

dicalcium silicate

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20
Q

C3A

A

tricalcium aluminate

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21
Q

C4AF

A

tetracalcium aluminoferrite

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22
Q

CSH2

A

gypsum

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23
Q

C-S-H

A

calcium silicate hydrate

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24
Q

CH

A

calcium hydroxide

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25
Q

Hydration of Portland cement results in:
a. ultimate production of ettringite over the long-term
b. absorption of heat
c. decreased porosity
d. decreased strength

A

decreased strength

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26
Q

the compound in Portland cement that produces the most heat (per g) during hydration is:
a. C3 A
b. C4 AF
c. C3 S
d. C2 S

A

C3S

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27
Q

Late strength is provided by the following Portland cement compound:
a. C3 A
b. C4 AF
c. C3 S
d. C2 S

A

C2S

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28
Q

An application that requires sulfate resistance would likely utilize:
a. Type V Portland cement
b. Type I Portland cement
c. Type IV Portland cement
d. Type III Portland cement

A

TYPE V

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29
Q
A
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30
Q

Fresh Portland cement concrete properties include:
a. E
b. creep
c. f’ c
d. segregation

A

SEGREGATION

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31
Q

Workability of fresh Portland cement is enhanced by:
a. utilizing angular aggregate
b. decreasing fine aggregate
c. adding air entraining admixture
d. adding accelerating admixture

A

ADDING AIR ENTRAINING ADMIXTURE

32
Q

The Portland cement hydration product associated with increased drying shrinkage is:
a. CH
b. C-S-H
c. gypsum
d. C3 A

A

CSH

33
Q

he most commonly measured hardened Portland cement concrete property is:
a. ft
b. slump
c. f’ c
d. MOR

A

f’c

33
Q

high strength Portland cement concrete would likely:
a. be air cured
b. include rounded aggregate
c. include a high w/c
d. include a water-reducing admixture

A

d. include a water-reducing admixture

33
Q

drying shrinkage in Portland cement concrete:
a. can be mitigated with air curing
b. occurs due to a gradient in relative humidity
c. results from lack of sufficient bleeding
d. is a fresh Portland cement concrete property

A

occurs due to a gradient in relative humidity

33
Q

Creep in Portland cement concrete:
a. results from the movement of hydration products in small pores
b. is irreversible
c. occurs due to a gradient in relative humidity
d. is controlled by transition zone microcracking and the movement of moisture due to constant
load

A

d. is controlled by transition zone microcracking and the movement of moisture due to constant
load

34
Q

Drying shrinkage and creep can BOTH be mitigated by:
a. increased aggregate stiffness
b. increased f’ c
c. increased paste volume
d. air curing

A

increased aggregate stiffness

35
Q

the durability issue in Portland cement concrete listed with its CORRECT expansive product that
causes cracking is:
a. F/T and rust
b. workability and slump
c. sulfate attack and ettringite
d. ASR and ice

A

c. sulfate attack and ettringite

36
Q

A desirable laboratory test for measuring hardened Portland cement concrete properties will be:
a. accurate
b. bias
c. precise
d. precise and accurate

A

precise and accurate *******

37
Q

durable Portland cement concrete would likely:
a. be exposed to water continuously
b. contain Type III Portland cement
c. have low w/c
d. contain a retarding admixture

A

low w/c

38
Q

ALL of the following cause cracking in Portland cement concrete EXCEPT:
a. DEF
b. collapse slump
c. ASR
d. plastic shrinkage

A

collapse slump

39
Q

The price of Portland cement concrete is driven by:
a. cement content
b. transportation costs
c. price of water
d. price of admixtures

A

cement content

40
Q

a common test for hardened concrete

A

f’c

41
Q

for high strength
loading type:

A

compressive

42
Q

for high strength
curing

A

moist

43
Q

for high strength
proportion w/c

A

low w/c

44
Q

for high strength
mineral admixture:

A

fly ash

45
Q

for high strength
aggregate gradation

A

high fm=5

46
Q

for high strength
cement type

A

type II

47
Q

G Values need for Portland Cement Concrete volumetric calculations include All of the following:

A

Gsb(OD)
Gsb(SSD)
Gc(cement)
Gf(fly ash)

48
Q

An important volumetric parameter in Portland Cement Concrete is:

A

%air

49
Q

The ingredient added to cement to slow down hydration is

A

gypsum

50
Q

The cement compound(s) most responsible for strength of concrete are:

A

C3S
C2S

51
Q

The following factor-level increases long-term/late strength of concrete

A

moist curing

52
Q

Expansive products that cause cracking in concrete include

A

ettringite, rust, ice, alkali-silica gel

53
Q

The 3 requirements for ASR are:

A

moisture
reactive silica
alkali

54
Q

improve the creep level
curing:

A

moist

55
Q

improve the creep level
water:

A

less

56
Q

improve the creep level
_____ aggregate:

A

stiff

57
Q

improve the creep level

________ stress

A

reduce

58
Q

Creep and drying shrinkage are both related to the movement of water in the C-S-H gel pores: T/F

A

true

59
Q

the portland cement hydration product associated with decreased durability due to sulfate attack is:

A

monosulfoaluminate

60
Q

an application that requires fast construction would likely utilize

A

type iii

61
Q

workability smooth or rough aggregate

A

smooth and round

62
Q

adding mineral admixture does what for worbaility

A

improve

63
Q

adding air entraining mixture does what for workability

A

improve

64
Q

high late strength
_______- admixture

A

water reducing

65
Q

high late strength
_____w/c

A

low

66
Q

high late strength
______cured

A

moist

67
Q

drying shrinkage in portland cement concrete can be mitigated by all of the following:

A

using stiffer aggregate
increasing CAF (decreasing paste)

68
Q

Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking:
freeze/thaw (F/T)

A

ICE

69
Q

Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking:
corrosion:

A

rust

70
Q

Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking:
sulfate attack:

A

ettringite

71
Q

Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking:

asr:

A

alkali silica gel

72
Q

Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking:

delayed ettringite fornation

A

ettringite

73
Q

VISCOELASTIC NATURE OF PORTLAND CEMENT CONCRETE CAN BE BENEFICIAL DUE TO

A

RELAXATION OF STRESS INDUCED BY RESTRAINED DEFORMATION

cven 342 quiz and survey (3 decks)

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