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CVEN 342 Test 2 Amy Martin questions with verified answers
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CVEN 342 Test 2 Amy Martin questions with verified answers
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CVEN 342 Test 2 Amy MartinSuperplasticizer - correct answer ✔✔Admixture that improves strength by reducing the water required
for workability.
Fly Ash - correct answer ✔✔Mineral admixture that improves durability by reacting with CH.
Which of the following is NOT a common component in PCC? a) water, b) polymers, c) sand, d) cement. -
correct answer ✔✔B) Polymers.
Chemical admixtures are used in PCC to: a) control setting, b) reduce workability, c) increase water
requirement, d) improve early strength. - correct answer ✔✔A) Control setting.
Volumetric mix design for PCC is based on: a) adjusting the volume of fine aggregate, b) 4% air, c)
sufficient workability, d) adjusting the volume of coarse aggregate. - correct answer ✔✔A) Adjusting the
volume of fine aggregate.
Chemical admixtures can have what benefits (3)? - correct answer ✔✔Control setting, improve
durability, improve sterngth and workability (also economical by reducing cement).
Mineral admixtures can have what benefits (7)? - correct answer ✔✔Economical, reduce heat, improve
durability (consume CH), improve workability (spherical particles), reduce bleeding and segregation (by
consuming water), improve strength (produce more CSH), affect ASR (lower pH, increase alkali), and
reduce sulfate attack (by consuming CH).
What two types of mineral admixtures are we generally concerned with? - correct answer ✔✔Fly Ash
(byproduct of burning coal), and Silica Fume (byproduct of silicon metal furnaces).
Mineral admixtures are used in PCC to: a) increase early strength, b) decrease workability, c) increase
long-term strength, d) increase porosity. - correct answer ✔✔C) Increase long-term strength.
, One of the raw materials used to manufacture Portland cement is: a) gypsum, b) C3A, c) ettringite, d)
limestone. - correct answer ✔✔D) Limestone
One of the primary reactants in hydration of Portland cement is: a) clay, b) C-S-H, c) C3S, d)
monosulfoaluminate. - correct answer ✔✔C) C3S
One of the primary hydration products in concrete is: a) sandstone, b) CH, c) C2S, d)C3A. - correct answer
✔✔B) CH
Both asphalt concrete and Portland cement concrete: a) contain the same volume of aggregate, b) are
produced at ambient temperatures, c) are considered large-particle composites, d) utilize oven-dry
aggregates. - correct answer ✔✔C) Are considered large-particle composites
The compound in Portland cement that produces the most heat during exothermic hydration is: a) C4AF,
b) C3A, c) C2S, d) C3S. - correct answer ✔✔D) C3S (Because there is a LOT more C3S)
One of the tests on fresh PCC is: a) f'c, b) chord modulus, c) MOR, d) unit weight. - correct answer ✔✔D)
Unit weight
Low strength PCC is likely the result of a) low w/c, b) curing at high relative humidity, c) high w/c, d) the
use of a water-reducing admixture. - correct answer ✔✔C) High w/c
One of the tests on hardened Portland cement concrete is: a) ft, b) slump, c) air content, d) TSR. - correct
answer ✔✔A) ft
Volumetric changes in Portland cement concrete include: a) modulus and f'c, b) creep and shrinkage, c)
slump and air content, d) F/T and DEF - correct answer ✔✔D) Freeze Thaw (F/T) and Delayed Ettringite
Formation (DEF)
Shrinkage in Portland cement concrete: a) can occur before or after set, b) is reversible, c) results from
the movement of moisture due to load, d) is mitigated by increasing strength. - correct answer ✔✔A)
Can occur before or after set.
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