Concrete Test 2024|Questions and 100%
Correct Answers| Latest Update
What jobsite preparation helps prevent slump loss after the concrete has been placed. -
ANSWER Sprinkle the sub grade and the forms with water. Schedule trucks to reduce
waiting time on a job.
Why is too much water in concrete mix harmful? - ANSWER Adding more water than necessary
to produce workable concrete causes excessive shrinking, increasing the risk of shrinkage
cracking. It also reduces concrete strength.
The natural air content of non-air entrained concrete is? - ANSWER 1-1.5%
What joint depth would you recommend for a 6" thick concrete slab? - ANSWER 1/4 the
thickness or 1.5 inches
When may water be added to the mix to increase slump? - ANSWER Standard
specifications limit the addition of water for slump adjustment to when the load is to be
discharged.
What percent entrained air is to be used in exterior concrete? - ANSWER 5%
An area to be poured should be poured when? - ANSWER The day prior to the pour
How many footings should be tested for sub grade compaction prior to pouring? - ANSWER All
of them!
, What type of dowels are used for construction joints in floor slabs? - ANSWER Smooth
Check every other concrete ticket for the specified design mix (True or False) - ANSWER False
If temperatures are forecast for below ______ then protect the floor slab with blankets.
Footings and foundations should be protected below _______. - ANSWER 32 degrees, 25
degrees
A Superintendent does not need to check concrete quantities for pours unless we are buying
concrete direct (True or False) - ANSWER False
How soon does Ff, Fl, or Fmin testing need to take place after the pour? - ANSWER Same day as
pour.
Do we add curing compound to the edge of slabs? - ANSWER Yes, 2' from edge
Where should visqueen vapor barrier be installed? - ANSWER In areas that will have
floor covering. Typically office spaces. Stego vapor barrier is applied in freezer slabs.
What part do cement (sprinkled on top of the slab during finishing as a drier) and water
(sprinkled on the slab to maintain plasticity) play in the curing and finishing of a Murray slab.
- ANSWER None.
Where do we allow fly ash? - ANSWER Footings, panels, sidewalks (not floor slabs!)
Do we allow the use of fly ash? - ANSWER No
What is the maximum pour size per pour (based on one laser screed, one crew, and one quality
control technician? - ANSWER 25,000 to 30,000
Correct Answers| Latest Update
What jobsite preparation helps prevent slump loss after the concrete has been placed. -
ANSWER Sprinkle the sub grade and the forms with water. Schedule trucks to reduce
waiting time on a job.
Why is too much water in concrete mix harmful? - ANSWER Adding more water than necessary
to produce workable concrete causes excessive shrinking, increasing the risk of shrinkage
cracking. It also reduces concrete strength.
The natural air content of non-air entrained concrete is? - ANSWER 1-1.5%
What joint depth would you recommend for a 6" thick concrete slab? - ANSWER 1/4 the
thickness or 1.5 inches
When may water be added to the mix to increase slump? - ANSWER Standard
specifications limit the addition of water for slump adjustment to when the load is to be
discharged.
What percent entrained air is to be used in exterior concrete? - ANSWER 5%
An area to be poured should be poured when? - ANSWER The day prior to the pour
How many footings should be tested for sub grade compaction prior to pouring? - ANSWER All
of them!
, What type of dowels are used for construction joints in floor slabs? - ANSWER Smooth
Check every other concrete ticket for the specified design mix (True or False) - ANSWER False
If temperatures are forecast for below ______ then protect the floor slab with blankets.
Footings and foundations should be protected below _______. - ANSWER 32 degrees, 25
degrees
A Superintendent does not need to check concrete quantities for pours unless we are buying
concrete direct (True or False) - ANSWER False
How soon does Ff, Fl, or Fmin testing need to take place after the pour? - ANSWER Same day as
pour.
Do we add curing compound to the edge of slabs? - ANSWER Yes, 2' from edge
Where should visqueen vapor barrier be installed? - ANSWER In areas that will have
floor covering. Typically office spaces. Stego vapor barrier is applied in freezer slabs.
What part do cement (sprinkled on top of the slab during finishing as a drier) and water
(sprinkled on the slab to maintain plasticity) play in the curing and finishing of a Murray slab.
- ANSWER None.
Where do we allow fly ash? - ANSWER Footings, panels, sidewalks (not floor slabs!)
Do we allow the use of fly ash? - ANSWER No
What is the maximum pour size per pour (based on one laser screed, one crew, and one quality
control technician? - ANSWER 25,000 to 30,000
