ACI Concrete/Masonry Exam Chapters 1-
10
Concrete is sold by the ton T/F
• CORRECT ANSWER: False (by Volume)
Delays in discharging concrete trucks can result in the concrete being hard to:
• CORRECT ANSWER: Pump, place, and finish
When there is room for two concrete trucks ready to discharge into a pump
hopper, placement is faster because:
• CORRECT ANSWER: as one truck is finishing, the other is ready to unload
concrete
You can tell when water was added to the truck by looking at the:
• CORRECT ANSWER: Batch Ticket
When concrete for a slab placement will be discharged from the truck chute, truck
arrivals should usually be spaced about:
• CORRECT ANSWER: 15 mins
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. T/F
• CORRECT ANSWER: True
,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 to three cubic yards (cubic meters) less so you don't waste concrete that
is not needed. T/F
• CORRECT ANSWER: False
Concrete made with portland cement will set and harden while under water? T/F
• CORRECT ANSWER: False
If a concrete slab on ground won't be exposed to sulfates, the cement used is most
likely to be:
• CORRECT ANSWER: Type I
Most concrete used in slabs on ground has coarse aggregate with a maximum size
of:
• CORRECT ANSWER: 3/4 to 1 1/2 in
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.
T/F
• CORRECT ANSWER: True
Increasing the amount of sand in a concrete usually decreases the amount of water
needed to make the concrete workable. T/F
• CORRECT ANSWER: False
All concrete that will be subject to freezing when moist or be exposed to deicing
salts should contain:
• CORRECT ANSWER: An air-entraining agent
, Strength of normal weight concrete depends mainly on:
• CORRECT ANSWER: water-cement ratio
Over-sanded concrete mixtures are likely to produce floors with poor wear
resistance and excessive shrinkage. T/F
• CORRECT ANSWER: True
To minimize shrinkage and reduce cracking and curling:
• CORRECT ANSWER: Much coarse aggregate
Little mixing water
Aggregate low shrinkage
(All of the above)
Air-entrained concrete is not recommended for use in concrete slabs:
• CORRECT ANSWER: Finished by repeated steel troweling passes
Changes in concrete temperature affect:
• CORRECT ANSWER: Setting time
Air content
Slump
(All of the above)
To determine if concrete, in place, has the strength needed to put into service, test
cylinders should be:
• CORRECT ANSWER: Kept at the job site and cured under conditions similar to
the curing conditions for the concrete they represent
Granular subbases for slabs on ground can be compacted with sheepsfoot rollers.
T/F
10
Concrete is sold by the ton T/F
• CORRECT ANSWER: False (by Volume)
Delays in discharging concrete trucks can result in the concrete being hard to:
• CORRECT ANSWER: Pump, place, and finish
When there is room for two concrete trucks ready to discharge into a pump
hopper, placement is faster because:
• CORRECT ANSWER: as one truck is finishing, the other is ready to unload
concrete
You can tell when water was added to the truck by looking at the:
• CORRECT ANSWER: Batch Ticket
When concrete for a slab placement will be discharged from the truck chute, truck
arrivals should usually be spaced about:
• CORRECT ANSWER: 15 mins
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. T/F
• CORRECT ANSWER: True
,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 to three cubic yards (cubic meters) less so you don't waste concrete that
is not needed. T/F
• CORRECT ANSWER: False
Concrete made with portland cement will set and harden while under water? T/F
• CORRECT ANSWER: False
If a concrete slab on ground won't be exposed to sulfates, the cement used is most
likely to be:
• CORRECT ANSWER: Type I
Most concrete used in slabs on ground has coarse aggregate with a maximum size
of:
• CORRECT ANSWER: 3/4 to 1 1/2 in
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.
T/F
• CORRECT ANSWER: True
Increasing the amount of sand in a concrete usually decreases the amount of water
needed to make the concrete workable. T/F
• CORRECT ANSWER: False
All concrete that will be subject to freezing when moist or be exposed to deicing
salts should contain:
• CORRECT ANSWER: An air-entraining agent
, Strength of normal weight concrete depends mainly on:
• CORRECT ANSWER: water-cement ratio
Over-sanded concrete mixtures are likely to produce floors with poor wear
resistance and excessive shrinkage. T/F
• CORRECT ANSWER: True
To minimize shrinkage and reduce cracking and curling:
• CORRECT ANSWER: Much coarse aggregate
Little mixing water
Aggregate low shrinkage
(All of the above)
Air-entrained concrete is not recommended for use in concrete slabs:
• CORRECT ANSWER: Finished by repeated steel troweling passes
Changes in concrete temperature affect:
• CORRECT ANSWER: Setting time
Air content
Slump
(All of the above)
To determine if concrete, in place, has the strength needed to put into service, test
cylinders should be:
• CORRECT ANSWER: Kept at the job site and cured under conditions similar to
the curing conditions for the concrete they represent
Granular subbases for slabs on ground can be compacted with sheepsfoot rollers.
T/F
