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Slag Cement University > Slag Cement University > Flashcards

Slag Cement University Flashcards

Study for the Slag Cement University Exam

1
Q

True or False: A portion of portland cement can be replaced with Slag Cement to create a stronger and more durable concrete.

A

True

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2
Q

True or False: In concrete, slag cement may be proportioned from 20 to 80% depending on the application.

A

True

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3
Q

Why is the lower heat evolution characteristic of slag cement in the summer beneficial?

A

Because it allows more time for placing and finishing concrete

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4
Q

True or False: The specific gravity of slag cement ranges from 2.85 to 2.94, depending on the source.

A

True

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5
Q

______ is defined as the point in time at which penetration resistance reaches specified values.

A

Time of initial set

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6
Q

True or False: At temperatures greater than 85 degrees Fahrenheit, concrete containing slag cement can have longer times of set.

A

False

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7
Q

______ are an effective way to control cracking due to shrinkage.

A

Saw-cut joints

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8
Q

True or False: The later the concrete can be cut without raveling, the better the chances are that concrete will not crack before saw cutting.

A

False

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9
Q

A concrete mix with quartzite needs to achieve a compressive strength of nearly _____ psi more than a gravel mix before it can be safely saw cut.

A

800

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10
Q

True or False: As a rough guideline, the time to saw cut is delayed approximately 30 minutes for every 20% of slag cement replacing portland cement.

A

False

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11
Q

True or False: Slag cement and Portland cement are stored in a similar manner.

A

True

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12
Q

Slag cement must be stored in ____ or ____ to provide protections from moisture and contamination.

A

Bins, Silos

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13
Q

_____ refers to leveling, smoothing, consolidating and otherwise treating surfaces of fresh, plastic concrete to produce desired surface or appearance.

A

Finishing

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14
Q

Concrete with lower permeability can generally be achieved by substituting between ______ percent slag cement for Portland cement.

A

25%-65%

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15
Q

Slag cement ___ concrete permeability.

A

Reduces

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16
Q

True or False: When reinforcing steel in concrete corrodes, the product of that corrosion (rust) takes up more volume.

A

True

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17
Q

Sulfate attack is a common form of ______

A

Concrete deterioration

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18
Q

True or False: Slag cement can give a Type I cement the sulfate resisting properties of a Type II cement.

A

True

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19
Q

True or False: Slag cement can give a Type I or a Type II cement the sulfate resisting properties of a Type V cement.

A

True

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20
Q

_____ is a chemical reaction between the alkalies in portland cement and certain types of silica minerals present in some aggregates.

A

Alkali-silica reaction (ASR)

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21
Q

True or False: Slag cement can be used to reduce alkali loading in concrete.

A

True

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22
Q

In ASR, the reaction product is _____, which absorbs moisture and swells.

A

Hygroscopic gel

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23
Q

Cement hydration generates _____.

A

Heat

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24
Q

Hardened concrete containing slag cement may show mottled ___ or ___ areas on the surface in the first few days after placement, which goes away within 1-2 weeks.

A

Green; blue green

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25
Q

True or False: Concrete greening does not affect concrete performance.

A

True

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26
Q

The blue-green color, commonly referred to as “greening”, is attributed to a complex reaction of ___________ in slag cement with other compounds in portland cement.

A

Sulfide Sulphur

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27
Q

At normally specified replacement levels, concrete made with slag cement will have lower _________ than concrete made with Class F and C fly ash when tested according to ASTM C1202.

A

Permeability

28
Q

Slag cement will provide concrete with ______ reflectivity than ordinary portland cement concrete.

A

Higher

29
Q

Blended cements incorporating slag and portland cement are specified in _______.

A

ASTM C595

30
Q

ASTM C989 Specifies ________ ground granulated blast-furnace slag for use as a cementitious material in concrete and mortar.

A

Finely

31
Q

True or False: Slag cement should be used as a pound for pound replacement for a portion of the portland cement in a concrete mixture.

A

True

32
Q

True or False: If the specific slag/portland cement mixture is shown to mitigate ASR in accordance with ASTM C1778, low alkali cement is necessary.

A

False

33
Q

___________ is the non-metalic product, consisting essentially of silicates and aluminosilicates of calcium and other bases, which is developed in a molten condition simultaneously with iron in a blast furnace.

A

Blast furnace slag

34
Q

True or False: Concrete made with slag cement provides higher compressive and flexural strength compared with straight portland cement concrete

A

True

35
Q

_____ day strengths generally increase as the percentage of slag cement increases, up to about 50% slag cement as a percent of cementitious material.

A

28

36
Q

What product created from portland cement reacting with water is beneficially utilized by slag cement to improve the strength and permeability properties of concrete?

A

Calcium hydrate

37
Q

Concrete flexural strengths in excess of ______ psi are common with mixes containing slag cement.

A

1,000

38
Q

When used at ______ replacement rates, slag cement will provide _______ heat in mass concrete.

A

High, lower

39
Q

Engineers and concrete producers who have successfully incorporated slag cement in their HPC mixtures have used slag cement in ranges from ________ percent of cementitious material.

A

20 to 80

40
Q

True or False: Slag cement can improve both the plastic and hardened properties of precast and prestressed concrete.

A

True

41
Q

Slag cement _________ concrete permeability, which in turn increases resistance to chloride intrusion.

A

Reduces

42
Q

Slag cement improves the workability of concrete due to its _______ and ________ structure.

A

Fine grind, glassy

43
Q

True or False: Slag cement is not an ideal material for concrete pipe.

A

False

44
Q

Elevated curing temperatures _________ early age strength development in mixtures containing slag cement

A

Activate

45
Q

Slag cement ________ surface texture and density when used in concrete block mixtures.

A

Improves

46
Q

At ______ days, strengths are superior when concrete pipe is manufactured with slag cement.

A

28

47
Q

Block manufactured with slag cement will have a ______ finished color.

A

Lighter

48
Q

Slag cement combines with _____________ and ___________ in portland cement to reduce efflorescence.

A

Calcium hydroxide & soluble salts

49
Q

True or False: Slag cement is advantageous in decorative concrete because of its lighter color?

A

True

50
Q

Ternary concrete mixtures include ______ different cementitious materials.

A

3

51
Q

True or False: Ternary blends have performed for many years in severe conditions with no apparent loss of durability.

A

True

52
Q

Ternary mixtures can be used in ______ concrete applications.

A

Any

53
Q

Utilization of slag cement in concrete _______ the burden on landfills

A

Lessens

54
Q

In high performance and mass concrete applications slag cement can be used as a substitute up to ______ percent.

A

80%

55
Q

Slag cement requires nearly _____ percent less energy to produce than and equivalent amount of portland cement.

A

90%

56
Q

Because slag cement has a lighter color it reduces the “________” effect.

A

Heat island

57
Q

How is slag cement manufactured?

A

Slag cement is formed when molten slag, diverted from an iron blast furnace, is rapidly quenched producing glassy granules ground to cement fineness.

58
Q

Slag cement particles have a _________ structure/shape.

A

Glassy/angular

59
Q

True or False: Slag cement composition is closer to portland cement than other SCMs.

A

True

60
Q

The reaction of cement and water will produce two primary hydration products:

A

Calcium Silica Hydrate (CSH) and Calcium Hydroxide (CaOH)

61
Q

True or False: Slag cements time of set increases versus reference portland cement by ½ to 1 hour at 73 degrees Fahrenheit (23 degrees Celsius). There is little change above 85 degrees Fahrenheit.

A

True

62
Q

Slag cement ________ the total alkalis in the system, _________ the alkali-silica ratio and the potential for alkali silica reaction (ASR).

A

Reduces, reduces

63
Q

Slag cement use leads to lower heat of hydration in mass concrete by __________% compared to portland cement concrete.

A

15-50%

64
Q

True or False: Concrete made with slag cement tends to be lighter and brighter in color with more reflectivity than mix designs with only portland cement.

A

True

65
Q

What does the Life Cycle Assessment Calculator for Slag Cement do?

A

Shows comparisons of environmental impact of various mix designs with slag cement at various percentage replacement rates, based on industry wide Environmental Product Declaration information.

Slag Cement University (1 decks)

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