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Materials Science 1 > Portland Cement (extra) > Flashcards

Portland Cement (extra) Flashcards

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1
Q

what are the three main raw materials of PC cement?

A
  • lime CaO
  • silica SiO2, alumina Al2O3
  • gypsum CaSO4
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2
Q

what do the three main raw materials of PC form? what is it called?

A

clinker

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3
Q

what does the C notation mean?

A

CaO

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4
Q

what does the S notation mean?

A

SiO2

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5
Q

what does the A notation mean?

A

Al2O3

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6
Q

what does the F notation mean?

A

Fe2O3

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7
Q

what does the H notation mean?

A

H2O

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8
Q

what does the Š notation mean?

A

SO3

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9
Q

what is the reaction for stage 1 (alite phase)?

A

2C3S + 6H —> C3S2H3 + 3Ca(OH)2

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10
Q

what is the reaction for stage 2 (belite phase)?

A

2C2S + 4H —> C3S2H3 + Ca(OH)2

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11
Q

what is the reaction for stage 3 (tricalcium alumninate phase)?

A

C3A + 6H —> C3AH6

C3A + 3CŠ.2H + 26H —> C6AŠ3H32 (ettringite)

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12
Q

what is the reaction for stage 4 (calcium alumino ferrite phase)?

A

C4AF + calcium hydroxide + gypsum + water —> solid solution of sulfoaluminate & sulfoferrite

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13
Q

which stage is faster, alite or belite?

A

alite is FAST

belite is SLOW

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14
Q

what is the alite phase responsible for?

A

early, initial strength

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15
Q

what is the belite phase responsible for?

A

long term strength

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16
Q

why is gypsum added in stage 3?

A

added to slow the rate of reaction, stage 3

17
Q

what product of the hydration reactions is the main source of the concrete’s strength?

A

C-S-H gel

18
Q

where is most of the C-S-H gel formed, in the alite or belite stage?

A

the alite stage

19
Q

what happens in stage 3 (general)?

A
  • produces rapid setting “flash set”
  • high heat of hydration
  • ettringite and then monosulfate form
  • ettringite = rod like crystals
  • monosulfate usually replaces ettringite
20
Q

what stage gives concrete its characteristic grey colour?

A

stage 4

21
Q

what are the pozzolanic reactions?

A

S + CH + H —> C-S-H

AxSy + mCH + nH —> C-S-H + C-A-H

Materials Science 1 (10 decks)

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