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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
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
decreased strength
26
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
C3S
27
Late strength is provided by the following Portland cement compound: a. C3 A b. C4 AF c. C3 S d. C2 S
C2S
28
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
TYPE V
29
30
Fresh Portland cement concrete properties include: a. E b. creep c. f’ c d. segregation
SEGREGATION
31
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
ADDING AIR ENTRAINING ADMIXTURE
32
The Portland cement hydration product associated with increased drying shrinkage is: a. CH b. C-S-H c. gypsum d. C3 A
CSH
33
he most commonly measured hardened Portland cement concrete property is: a. ft b. slump c. f’ c d. MOR
f'c
33
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
d. include a water-reducing admixture
33
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
occurs due to a gradient in relative humidity
33
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
d. is controlled by transition zone microcracking and the movement of moisture due to constant load
34
Drying shrinkage and creep can BOTH be mitigated by: a. increased aggregate stiffness b. increased f’ c c. increased paste volume d. air curing
increased aggregate stiffness
35
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
c. sulfate attack and ettringite
36
A desirable laboratory test for measuring hardened Portland cement concrete properties will be: a. accurate b. bias c. precise d. precise and accurate
precise and accurate *********
37
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
low w/c
38
ALL of the following cause cracking in Portland cement concrete EXCEPT: a. DEF b. collapse slump c. ASR d. plastic shrinkage
collapse slump
39
The price of Portland cement concrete is driven by: a. cement content b. transportation costs c. price of water d. price of admixtures
cement content
40
a common test for hardened concrete
f'c
41
for high strength loading type:
compressive
42
for high strength curing
moist
43
for high strength proportion w/c
low w/c
44
for high strength mineral admixture:
fly ash
45
for high strength aggregate gradation
high fm=5
46
for high strength cement type
type II
47
G Values need for Portland Cement Concrete volumetric calculations include All of the following:
Gsb(OD) Gsb(SSD) Gc(cement) Gf(fly ash)
48
An important volumetric parameter in Portland Cement Concrete is:
%air
49
The ingredient added to cement to slow down hydration is
gypsum
50
The cement compound(s) most responsible for strength of concrete are:
C3S C2S
51
The following factor-level increases long-term/late strength of concrete
moist curing
52
Expansive products that cause cracking in concrete include
ettringite, rust, ice, alkali-silica gel
53
The 3 requirements for ASR are:
moisture reactive silica alkali
54
improve the creep level curing:
moist
55
improve the creep level water:
less
56
improve the creep level _____ aggregate:
stiff
57
improve the creep level ________ stress
reduce
58
Creep and drying shrinkage are both related to the movement of water in the C-S-H gel pores: T/F
true
59
the portland cement hydration product associated with decreased durability due to sulfate attack is:
monosulfoaluminate
60
an application that requires fast construction would likely utilize
type iii
61
workability smooth or rough aggregate
smooth and round
62
adding mineral admixture does what for worbaility
improve
63
adding air entraining mixture does what for workability
improve
64
high late strength _______- admixture
water reducing
65
high late strength _____w/c
low
66
high late strength ______cured
moist
67
drying shrinkage in portland cement concrete can be mitigated by all of the following:
using stiffer aggregate increasing CAF (decreasing paste)
68
Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking: freeze/thaw (F/T)
ICE
69
Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking: corrosion:
rust
70
Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking: sulfate attack:
ettringite
71
Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking: asr:
alkali silica gel
72
Match the durability issue in portland cement concrete listed with its correct expansive product that causes cracking: delayed ettringite fornation
ettringite
73
VISCOELASTIC NATURE OF PORTLAND CEMENT CONCRETE CAN BE BENEFICIAL DUE TO
RELAXATION OF STRESS INDUCED BY RESTRAINED DEFORMATION

cven 342 quiz and survey (3 decks)

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