ACI FLATWORK EXAM ALL POSSIBLE
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS VERIFIED
⩥ 100.
Answer: (Ch. 1, #2) If the crew can place and finish 100yd^3 (m^3) of
concrete per hour, the producer's rate should be about ____ yd^3(m^3)
per hour.
⩥ False (sold by volume).
Answer: (Ch 1, #3) True or False: Concrete is sold by the ton.
⩥ pump, place, and finish.
Answer: (Ch. 1, #4) Delays in discharging concrete trucks can result in
the concrete being hard to:
⩥ A) 407.41; B) 297.
Answer: (Ch. 1, #5)
A) Inch/Pound: For a concrete floor slab that is 6 in. thick, 200ft long,
and 100 ft wide you should order ____ yd^3 of concrete, assuming a
10% waste factor.
,B) Metric: For a concrete floor slab that is 150 mm thick, 60 m long, and
30 m wide you should order ____ m^3 of concrete, assuming a 10%
waste factor.
⩥ as one truck is finishing, the other is ready to unload concrete.
Answer: (Ch. 1, #6) When there is room for two concrete trucks ready to
discharge into a pump hopper, placement is faster because:
⩥ 1.5.
Answer: (Ch. 1, #7) Concrete from a ready mix truck must be
completely discharged within ____ hours after water has been added at
the plant.
⩥ batch ticket.
Answer: (Ch. 1, #8) You can tell when water was added to the concrete
truck by looking at the:
⩥ 15 minutes.
Answer: (Ch. 1, #9) When concrete for a slab placement will be
discharged from the truck chute, truck arrivals should usually be spaced
about:
⩥ True.
,Answer: (Ch. 1, #10) True or False: When finishers get behind because
the concrete is setting faster than expected and the placing crew is also
shorthanded, one solution is slowing the concrete delivery rate to match
worker output.
⩥ False (Standard is to order 10% to 15% *more* than measured
volume for small orders and 5 to 10% more than measured volume for
large orders to account for subgrade settlement, uneven subgrade,
spillage, and waste.).
Answer: (Ch. 1, #11) True or False: In deciding how much concrete to
order for a floor placement, you should calculate the number of cubic
yards (cubic meters) needed to fill the forms, then order two or three
cubic yards (cubic meters) less so you don't waste concrete that is not
needed.
⩥ preconstruction conference.
Answer: (Ch. 1, #12) The question "What finisher or finishers can
request the addition of water to the concrete truck on site?" Should be
answered at the _________ __________.
⩥ True.
Answer: (Ch. 2, #1) True or False: Concrete made with portland cement
will set and harden while underwater.
⩥ Type I.
, Answer: (Ch. 2, #2) If a concrete slab on ground won't be exposed to
sulfates, the cement used is most likely to be:
⩥ portland.
Answer: (Ch. 2, #3) Fly ash may be added to concrete from a fly ash silo
at the batch plant or from a silo containing a _______ cement.
⩥ 0.75 to 1.5 in. (19 to 38 mm.).
Answer: (Ch. 2, #4) Most concrete used in slabs on ground has course
aggregate with a maximum size of:
⩥ True.
Answer: (Ch. 2, #5) True or False: Sand for concrete used in slabs on
ground is easier to finish when it has close to the largest allowable
amount of material passing the No. 50 and No. 100 sieves.
⩥ False (Too many small particles will *increase* the amount of water
needed to make the concrete workable.).
Answer: (Ch. 2, #6) True or False: Increasing the amount of sand in a
concrete usually decreases the amount of water needed to make the
concrete workable.
⩥ an air-entraining agent.
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS VERIFIED
⩥ 100.
Answer: (Ch. 1, #2) If the crew can place and finish 100yd^3 (m^3) of
concrete per hour, the producer's rate should be about ____ yd^3(m^3)
per hour.
⩥ False (sold by volume).
Answer: (Ch 1, #3) True or False: Concrete is sold by the ton.
⩥ pump, place, and finish.
Answer: (Ch. 1, #4) Delays in discharging concrete trucks can result in
the concrete being hard to:
⩥ A) 407.41; B) 297.
Answer: (Ch. 1, #5)
A) Inch/Pound: For a concrete floor slab that is 6 in. thick, 200ft long,
and 100 ft wide you should order ____ yd^3 of concrete, assuming a
10% waste factor.
,B) Metric: For a concrete floor slab that is 150 mm thick, 60 m long, and
30 m wide you should order ____ m^3 of concrete, assuming a 10%
waste factor.
⩥ as one truck is finishing, the other is ready to unload concrete.
Answer: (Ch. 1, #6) When there is room for two concrete trucks ready to
discharge into a pump hopper, placement is faster because:
⩥ 1.5.
Answer: (Ch. 1, #7) Concrete from a ready mix truck must be
completely discharged within ____ hours after water has been added at
the plant.
⩥ batch ticket.
Answer: (Ch. 1, #8) You can tell when water was added to the concrete
truck by looking at the:
⩥ 15 minutes.
Answer: (Ch. 1, #9) When concrete for a slab placement will be
discharged from the truck chute, truck arrivals should usually be spaced
about:
⩥ True.
,Answer: (Ch. 1, #10) True or False: When finishers get behind because
the concrete is setting faster than expected and the placing crew is also
shorthanded, one solution is slowing the concrete delivery rate to match
worker output.
⩥ False (Standard is to order 10% to 15% *more* than measured
volume for small orders and 5 to 10% more than measured volume for
large orders to account for subgrade settlement, uneven subgrade,
spillage, and waste.).
Answer: (Ch. 1, #11) True or False: In deciding how much concrete to
order for a floor placement, you should calculate the number of cubic
yards (cubic meters) needed to fill the forms, then order two or three
cubic yards (cubic meters) less so you don't waste concrete that is not
needed.
⩥ preconstruction conference.
Answer: (Ch. 1, #12) The question "What finisher or finishers can
request the addition of water to the concrete truck on site?" Should be
answered at the _________ __________.
⩥ True.
Answer: (Ch. 2, #1) True or False: Concrete made with portland cement
will set and harden while underwater.
⩥ Type I.
, Answer: (Ch. 2, #2) If a concrete slab on ground won't be exposed to
sulfates, the cement used is most likely to be:
⩥ portland.
Answer: (Ch. 2, #3) Fly ash may be added to concrete from a fly ash silo
at the batch plant or from a silo containing a _______ cement.
⩥ 0.75 to 1.5 in. (19 to 38 mm.).
Answer: (Ch. 2, #4) Most concrete used in slabs on ground has course
aggregate with a maximum size of:
⩥ True.
Answer: (Ch. 2, #5) True or False: Sand for concrete used in slabs on
ground is easier to finish when it has close to the largest allowable
amount of material passing the No. 50 and No. 100 sieves.
⩥ False (Too many small particles will *increase* the amount of water
needed to make the concrete workable.).
Answer: (Ch. 2, #6) True or False: Increasing the amount of sand in a
concrete usually decreases the amount of water needed to make the
concrete workable.
⩥ an air-entraining agent.
