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Cven 342 midterm 2 questions well answered to pass
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Cven 342 midterm 2 questions well answered to pass
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Cven 342 midterm 2Hydraulic cement definition - correct answer ✔✔Cement capable of setting, hardening, and remaining
stable by a reaction with water.
Hydraulic cement ingredients - correct answer ✔✔pulverized clinkers of calcium silicates & small amount
of calcium sulfate -- essentially need calcium & silica
Sources of calcium - correct answer ✔✔calcereous materials - carbonate rocks (limestone, chalk, marl,
sea shells) -- 2/3 of cement mix
Sources of silica - correct answer ✔✔argillaceous materials - clays and shales (contains silica, alumina,
iron)
Cement manufacturing steps - correct answer ✔✔1. materials crushed, grinded, and blended
2. put in kiln and heated at 1400C
3. blended w 5% gypsum (other 95% called clinker)
C - correct answer ✔✔CaO
S - correct answer ✔✔SiO2
A - correct answer ✔✔Al2O3
F - correct answer ✔✔Fe2O3
M - correct answer ✔✔MgO
S- (s w bar on top) - correct answer ✔✔SO3
, H - correct answer ✔✔H2O
C3S - correct answer ✔✔3(CaO)SiO2
C2S - correct answer ✔✔2(CaO)SiO2
C3A - correct answer ✔✔3(CaO)Al2O3
C4AF - correct answer ✔✔4(CaO)Al2O3Fe2O3
Steps of hydration of cement - correct answer ✔✔cement + water --> dissolution --> precipitation
Chemical equation 1 - correct answer ✔✔2C3S + 6H --> C3S2H3 + 3CH + 120 cal/g
Chemical equation 2 - correct answer ✔✔2C2S + 4H --> C3S2H3 + CH + 62 cal/g
Chemical equation 3 - correct answer ✔✔C3A + CSbarH2 --> ettringite + 300 cal/g
Calcium silicate hydrate (solid in cement paste) - correct answer ✔✔C-S-H
50-60% of solids volume
high SA --> high van der waals forces --> high strength
morphology: poorly formed crystalline fibers to reticular network
Calcium hydroxide - correct answer ✔✔CH aka Ca(OH)2
20-25% volume
morph: tends to form large crystals of hexogonal prism shape, or if space confined are small stacks of
plates
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