Final Test 1 Flashcards by Emily Veal

Q

Products of c3s and c2s

A

CSH CH

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Q

Product of c3a

A

Ettringite

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Q

Effect of CSH

A

Strength

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Q

Effect of CH

A

Sulfate durability

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Q

C3s effect

A

Early strength

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Q

C2s effect

A

Late strength

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Q

C3a effect

A

Flash set, sometimes too fast

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Q

Type 1 pc

A

Normal

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Q

Type 2 pc

A

Moderate sulfate resistance

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Q

Type 3 pc

A

Early strength

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Q

Type 4 pc

A

Low heat of hydration

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Q

Type 5 pc

A

High sulfate resistance

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Q

Progress of hydration

A

1 ions dissolve
2 induction
3 4 acceleration and deceleration (hydration of c3s and c3a)
5 steady state

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Q

Hcp solids

A

Csh ch ettringite monosulfate hydrate

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Q

Reduce itz

A

Lower w/c use scms higher cm smaller msa

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Q

Reduce air

A

Fly ash silica fume slag

Q

Silica fume is

A

Pozzolanic

Q

Fly ash is, slag is

A

Pozzolanic and hydraulic

Q

Decrease bleeding

A

Fly ash silica fine fine slag metakaolin

Q

Decrease asr

A

All scms

Q

Early strength SCM

A

Fly ash

Q

Later strength SCM

A

Silica fume

Q

Early strength scms and late strength

A

Silica fume/ALL

Q

Pozzolanic increase durability through

A

Later formation of csh reducing ch improving itz

Q

Strength and low heat

A

Class f and sf

Q

Initial tan mod

A

0-1

Q

Chord mod

A

1-40%

Q

Secant mod

A

0-40%

Q

Prevent plastic shrinkage

A

Fibers, cool placement curing

Q

Prevent drying shrinkage

A

Minimize water use

Q

Drying shrinkage- when?

A

As concrete is drying

Q

Plastic shrinkage when?

A

Soon concrete in plastic state