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CIMT 348 Midterm Ch.1-3 > Chapter 1: Portland Cement Chemistry > Flashcards

Chapter 1: Portland Cement Chemistry Flashcards

1
Q

What is Portland Cement responsible for

A

Responsible for binding aggregate together = producing concrete

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2
Q

Portland Cement is made from what 3 elements

A

Limestone, clay, gypsum

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3
Q

Cement composition

A

SiO2, Al2O3, Fe2S3, CaO, MgO, So3

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4
Q

ASTM C150 what are the 5 types of cement

A

Type 1: general use
Type 2: moderate sulfate resistant
Type 3: high early strength
Type 4: low heat of hydration
Type 5: high sulfate resistant

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5
Q

What are the 4 cement composition

A

C2S
C3S
C3A
C4AF

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6
Q

C2S

A

Dicalcium Sulfate

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7
Q

C3S

A

Tri calcium Sulfate

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8
Q

C3A

A

Tri calcium aluminate

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9
Q

C4AF

A

Tetracalcium aluminate

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10
Q

What are the 3 main cement chemical hydrations equations

A

C2S + h20 = CH + CSH
C3S + h20 = CH + CSH
C3A + h20+ gypsum = Ettringite

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11
Q

What is CH

A

Calcium Hydroxide

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12
Q

What is CSH

A

Calcium Silicate Hydrate

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13
Q

Why does normal concrete stay plastic (workable) for a few hours ?

A

Takes time for cement to get supersaturated, having to produce ions, needing about 4 hours to hydrate and have chemicals bond together

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14
Q

What are the 4 hydration stages

A
  1. Initial
  2. Dormant
  3. Acceleration
  4. Deceleration
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15
Q

Impact of SCM - retarders

A

Increase stage 2

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16
Q

Impact of SCM - Accelerators

A

Push the saturation process

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17
Q

Impact of SCM - Accelerators

A

Push the saturation process

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18
Q

Differences of pozzolanic

A

Reacts with CH to produce CSH

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19
Q

Differences of Cementious

A

High amounts of SiO and CaO slag reacts with water to create CSH

20
Q

What SCMs are pozzolanic

A

Fly ash type F,
Silica fume,
Metakolin
Volcanic ash
Natural pozzolanic

21
Q

What SCMs are cementious

A

Fly ash type c
Slag
Any cementious material is considered pozzolanic

22
Q

Poreous solution

A

Water inside concrete

23
Q

What is PH level of concrete

A

13 or 14

24
Q

Silica Fume has high amounts of what

A

SiO2

25
Q

Slag has high amounts of

A

CaO, SiO2

26
Q

CAC has high amounts of

A

Al and Ca

27
Q

CSA has high amounts of

A

SO3 and Ca

28
Q

Cement has high amounts of

A

CaO

29
Q

How does silica fume affect concrete

A

Increase workability with less water

30
Q

How does fly ash affect concrete

A

Decrease workability and increase high early strength

31
Q

What is amphorous particles

A

Disorganized particles

32
Q

What is crystalline particles

A

Organized molecules

33
Q

What is interfacial transition zone

A

Aggregate should be stronger than desired cement strength

34
Q

What is CSA

A

Calcium Sulfo Aluminate
Rapid set, very reactive

35
Q

What is CAC

A

Calcium aluminate cement
Slow set, chemical resistant

36
Q

What is ASTM C150

A

Standard specification for Portland Cement

37
Q

What is ASTM C595

A

Standard Specification of Blended Hydraulic Cement

38
Q

What is ASTM C 1157

A

Performance Specifications of Hydraulic Cement

39
Q

What is prescription specification

A

Ingredients inside concrete. What and how much

40
Q

Finer cement does what

A

Faster it will set and gain strength

41
Q

What are the Blended Hydraulic Cement in ASTM C595

A

Type IS: slag
Type IL: limestone
Type IP: pozzolanic
Type IT: ternary blended

42
Q

What are Hydraulic Cement in ASTM C 1157

A

Type GU: general use
Type MS: moderate sulfate
Type HS: High Sulfate
Type MH: moderate heat of hydration
Type LH: low heat of hydration
Type HE: high early strength

43
Q

Quality control measure of concrete

A

Slump,
Density
Volume,
Temperature
Air content
Water content
Compressive strength

44
Q

Quality control measures of cement

A

Fineness
Chemical composition
Set time
Air content of mortar
Autoclave expansion

45
Q

Quality control measures of cement

A

Fineness
Chemical composition
Set time
Air content of mortar
Autoclave expansion

CIMT 348 Midterm Ch.1-3 (3 decks)

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