Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CGN3501 Exam 1 > Portland Cement (Lecture 4) > Flashcards

Portland Cement (Lecture 4) Flashcards

1
Q

Type I Portland Cement

A

For General Use. No limits are placed on any four principal compounds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Type II Portland Cement

A

Moderate Sulfate resistance and moderate heat of hydration. Spec limits the C3A content to a max 8%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Type III Portland Cement

A

High Early Strength. C3A content is limited to max of 15%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Type IV Portland Cement

A

Low heat of hydration. max limits of 35% on C3S and 7% on C3A. Minimum 40% C2A.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Type V Portland Cement

A

High sulfate resistance. Max limit 5% on C3A.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Air entraining Portland Cement

A

Type IA, IIA, IIIA.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Pozzolan

A

siliceous or siliceous and aluminous material that has no cementing property but reacts with water to create Calcium hydroxide to form cementious product.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Properties of Pozzolan

A

1) Slow reaction
2) consumes CaOH
3) Fills large capillary spaces making concrete less permeable and more durable.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Blast Furnace Slag

A

Nonmetallic waste product from manufacturing of iron and steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Granulated Slag

A

Glassy Product formed by rapid cooling of molten blast furnace slag.
Is self cementing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Portland Blast Furnace Slag Cement

A

Type IS. blend of portland cement with 25-70% by weight of granulated blast furnace slag.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Portland Pozzolan Cement

A

Type IP & P. blend of portland cement with 15-40% fine pozzolan by weight.
Type P has lower early strength, used when high strength early is not required.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Effect of Pozzolan and Blast Furnace Slag on durability of concrete

A
  • Water resistance increased
  • Permeability is reduced
  • Sulfate resistance increased
  • Alkali aggregate expansion is reduced
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Colored cement

A

formed by adding pigments to white cement or using clinkers. similar to normal portland cememnt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

White cement

A

used to produce architectural concrete where white is desired. Formed by reducing iron content.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Hydraulic cement

A

hardens by reacting with water to form water resistant product. Portland cement is hydraulic.

17
Q

Non hydraulic cement

A

reacts with water to form product which is not stable in water. Hydration product may act with air to form water resistant product. EX. Quicklime

18
Q

Who invented portland cement?

A

Joseph Aspdin

19
Q

Why was portland cement named so?

A

Named after the concrete it produced resembling the color of the natural limestone quarried on the isle of portland.

20
Q

What is the largest size of portland cement?

A

Finer than 200 sieve (75micrometers)

21
Q

What is the typical specific gravity of portland cement

A

3.15

22
Q

What is the typical unit weight of portland cement

A

94pcf

23
Q

How much does a bag of portland cement weigh

A

94lbs

24
Q

What are the four main oxides in portland cement

A

Calcium Oxide
Silicon Oxide
Aluminum Oxide
Iron Oxide

25
Q

What are the four main compounds that form portland cememnt

A

Tricalcium Silicate- C3S
Dicalcium Silicate- C2S
Tricalcium Aluminate- C3A
Tetracalcium Aluminoferrite- C4AF

26
Q

What chemical abbreviation is C

A

calcium oxide

27
Q

What chemical abbreviation is S

A

Silicon Oxide

28
Q

What chemical abbreviation is A

A

Aluminum Oxide

29
Q

What chemical abbreviation is F

A

Iron oxide

30
Q

What are the properties of C3S

A

Hydrates and hardens rapidly

responsible for initial set and early strength

31
Q

What are the properties of C2S

A

Hydrates and hardens slowly

Contributes to strength increase beyond 1 week

32
Q

What are the properties of C3A

A

Hydrates rapidly and gives off a lot of heat
Contributes slightly to early strength
More susceptible to sulfate attacks which cause expansion and cracking

33
Q

What are the properties of C3AF

A

Contributes little to strength. Reduces clinkering temp in production of cement which reduces cost

34
Q

Is cement hydration endothermic or exothermic?

A

Exothermic (heat is generated)

35
Q

What does C3S and C2S produce?

A

Calcium Silicate Hydrate- strong and stable in water

Calcium Hydroxide- soluble in water

CGN3501 Exam 1 (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions