It is important that the ____________ __________ read and understand project specifications. -
finisher foreman
If the crew can place and finish 100 yd3 of concrete per hour, the producer's delivery rate should be
about _____ yd3 per hour. - 100
Concrete is sold by the ton? - False
Delays in d...
ACI Flatwork Questions & Answers |
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It is important that the ____________ __________ read and understand project specifications. -
✔✔finisher foreman
If the crew can place and finish 100 yd3 of concrete per hour, the producer's delivery rate should be
about _____ yd3 per hour. - ✔✔100
Concrete is sold by the ton? - ✔✔False
Delays in discharging concrete trucks can result in the concrete being hard to: - ✔✔pump, place, and
finish
When there is room for two concrete trucks ready to discharge into a pump hopper, placement is faster
because: - ✔✔as one truck is finishing, the other is ready to unload the concrete
Concrete from a ready mix truck must usually be completely discharged within _____ hours after water
has been added at the plant. - ✔✔1.5
You can tell when water has been added to the concrete truck by looking at the: - ✔✔batch ticket
When concrete for a slab placement will be discharged from the truck chute, truck arrivals should usually
be spaced at about: - ✔✔15 minutes
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. - ✔✔True
, In deciding how much concrete to order for a floor placement, you should calculate the number of cubic
yards needed to fill the forms, then order two to three cubic yards less so you don't waste concrete that
is not needed. - ✔✔False
The question, "What finisher or finishers can request addition of water to the concrete truck on site?"
should be answered at the ______ _________. - ✔✔Pre-construction meeting
Concrete made with portland cement will set and harden while under water. - ✔✔True
If a concrete slab on ground won't be exposed to sulfates, the cement used is most likely to be: -
✔✔Type I
Most concrete used in slabs on ground has coarse aggregate with a maximum size of: - ✔✔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 sieve. - ✔✔True
Increasing the amount of sand in a concrete usually decreases the amount of water needed to make the
concrete workable. - ✔✔False
All concrete that will be subject to freezing when moist or be exposed the deicing salts should contain: -
✔✔an air-entraining agent
Strength of normal weight concrete depends mainly on: - ✔✔water-cement ratio
Overhanded concrete mixtures are likely to produce floors with poor wear resistance and excessive
shrinkage. - ✔✔True
To minimize shrinkage and reduce cracking and curling: - ✔✔use as much coarse aggregate as possible,
use as little mixing water as possible, and use aggregates with low shrinkage
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