c8 exam 2 questions with correct answers
When pouring concrete over earth, place rebar on? - CORRECT ANSWERS
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✔✔steel
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How do Retarders work? - CORRECT ANSWERS ✔✔slowing down hydration
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What is the recommended grade for a 4-ft sidewalk? - CORRECT ANSWERS
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✔✔5%
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Which of the following should be held constant in a concrete mix? - CORRECT
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ANSWERS ✔✔water-to-cement ratio
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If a national code and a local code differ on a particular requirement, what
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should you go by? - CORRECT ANSWERS ✔✔local code
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To achieve 12% plasticity you would apply an additive to what Type cement
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to achieve 12% plasticity? - CORRECT ANSWERS ✔✔II
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Oil-well cement has relatively high amounts of what? - CORRECT ANSWERS
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✔✔retarder
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How does freshly poured concrete exert hydrostatic pressure in concrete? -
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CORRECT ANSWERS ✔✔horizontally
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, Basement concrete walls should have a minimum test psi at 30 days of what
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pressure? - CORRECT ANSWERS ✔✔4000 psi
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Maximum deflection allowed in columns, piers, walls, and arrises is _____ per
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10 ft? - CORRECT ANSWERS ✔✔1/4"
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What is the tool used to finish and flatten a slab? - CORRECT ANSWERS
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✔✔darby
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Horizontal pressure on forms will be affected least by what? - CORRECT
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ANSWERS ✔✔weight of the concrete
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Concrete test cylinders should be left on the jobsite for curing from 4 hr to
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how many hours? - CORRECT ANSWERS ✔✔24 hr
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What type of Portland cement is needed if it may be exposed to high sulfate
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content in the soil? - CORRECT ANSWERS ✔✔Type V
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When pouring concrete immediately on hardened concrete, what condition is
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best for the old concrete to be in? - CORRECT ANSWERS ✔✔rough
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What should you do if the temperature drops when pumping concrete? -
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CORRECT ANSWERS ✔✔speed up the pour
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When pouring concrete over earth, place rebar on? - CORRECT ANSWERS
|| || || || || || || || || ||
✔✔steel
||
How do Retarders work? - CORRECT ANSWERS ✔✔slowing down hydration
|| || || || || || || || ||
What is the recommended grade for a 4-ft sidewalk? - CORRECT ANSWERS
|| || || || || || || || || || ||
✔✔5%
||
Which of the following should be held constant in a concrete mix? - CORRECT
|| || || || || || || || || || || || ||
ANSWERS ✔✔water-to-cement ratio
|| || ||
If a national code and a local code differ on a particular requirement, what
|| || || || || || || || || || || || ||
should you go by? - CORRECT ANSWERS ✔✔local code
|| || || || || || || || ||
To achieve 12% plasticity you would apply an additive to what Type cement
|| || || || || || || || || || || ||
to achieve 12% plasticity? - CORRECT ANSWERS ✔✔II
|| || || || || || || ||
Oil-well cement has relatively high amounts of what? - CORRECT ANSWERS
|| || || || || || || || || ||
✔✔retarder
||
How does freshly poured concrete exert hydrostatic pressure in concrete? -
|| || || || || || || || || ||
CORRECT ANSWERS ✔✔horizontally
|| || ||
, Basement concrete walls should have a minimum test psi at 30 days of what
|| || || || || || || || || || || || ||
pressure? - CORRECT ANSWERS ✔✔4000 psi
|| || || || || ||
Maximum deflection allowed in columns, piers, walls, and arrises is _____ per
|| || || || || || || || || || ||
10 ft? - CORRECT ANSWERS ✔✔1/4"
|| || || || || ||
What is the tool used to finish and flatten a slab? - CORRECT ANSWERS
|| || || || || || || || || || || || ||
✔✔darby
||
Horizontal pressure on forms will be affected least by what? - CORRECT
|| || || || || || || || || || ||
ANSWERS ✔✔weight of the concrete
|| || || || ||
Concrete test cylinders should be left on the jobsite for curing from 4 hr to
|| || || || || || || || || || || || || ||
how many hours? - CORRECT ANSWERS ✔✔24 hr
|| || || || || || || ||
What type of Portland cement is needed if it may be exposed to high sulfate
|| || || || || || || || || || || || || ||
content in the soil? - CORRECT ANSWERS ✔✔Type V
|| || || || || || || || ||
When pouring concrete immediately on hardened concrete, what condition is
|| || || || || || || || ||
best for the old concrete to be in? - CORRECT ANSWERS ✔✔rough
|| || || || || || || || || || || ||
What should you do if the temperature drops when pumping concrete? -
|| || || || || || || || || || ||
CORRECT ANSWERS ✔✔speed up the pour
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