__________ reinforcing metallic bars no longer most effective have a differing chemical
composition, but are taken into consideration weldable. - ANS-A706
28-Day recognition of strength is the common of: - ANS-(3) four x eight cylinders or (2) 6 x
12 cylinders
A ____ is a horizontal member that transfers hundreds laterally. - ANS-Beam
A beam is typically concern to _____ whilst a column is more often than not concern to
______. - ANS-Flexure, compression
A concrete blend design specifies a water/cement ratio of 0.45 most. When batched, a
selected load has a water/cement ratio of 0.38. Which of the following statements is proper?
- ANS-The compressive electricity will probably be better than regular.
A grade 60 bar has - ANS-A minimal yield electricity of 60,000 psi
A low-alloy steel bar conforms to - ANS-ASTM A706
A mechanical splice need to achieve - ANS-125% of the grade power of the bar
Adding water to a concrete mix will: - ANS-Decrease the compressive strength
Additional revolutions of a drum mixer filled with concrete __________ the droop and
__________ the entrained air. - ANS-decrease, decrease
After initial curing is complete, sample cylinders have to be maintained at a temperature
between: - ANS-seventy three.5 +/- 3.5 ranges
Air content material required for a five,000 psi, 3/8 inch aggregate mix of concrete uncovered
to very severe cycles of freezing and thawing is: - ANS-7.Five%
Air-entraining admixtures must comply with: - ANS-ASTM C260
Aluminum embedments in structural concrete are: - ANS-Permitted best if coated or covered
to prevent an aluminum-concrete response
An suitable reinforcing steel help mechanism for a 24-inch deep footing includes: -
ANS-precast dobie blocks
An ASTM A615 #7 bar has the diameter of - ANS-7/8 of an inch (#22)
As a standard rule, lap splicing bars large than No. 11 is - ANS-now not authorized
, Bars must be tied in location to avoid displacement at some point of concrete placement.
The following is not appropriate for securing rebar intersections: - ANS-welding
Before new concrete is located, creation joints should be: - ANS-wetted, and status water
eliminated
Bundled bars will have a maximum of ____ bars bundled together. - ANS-four
Concrete can be located into its intended structure except: - ANS-It has segregated
Concrete uncovered to moisture however not external sources of chloride: - ANS-Is taken
into consideration moderate exposure, a class C1
Concrete is a mixture of - ANS-Aggregate, sand, cement and water
Concrete should be disbursed from the truck: - ANS-Before three hundred drum revolutions
take region
Concrete placed in an eleven-foot high column ought to now not: - ANS-be dropped from the
pinnacle of the shape
Concrete sampling must be done at not less than: - ANS-- Once for each 5,000 sq. Ft of
surface area for slabs or partitions
- Once for each one hundred fifty cu. Yards placed
- Once each 50 cu. Yards placed in step with day
Concrete with the maximum severe sulfate exposure may be in contact with a percent of soil
containing water-soluble sulfate: - ANS-Greater than 2.00
Construction joints have the following guidelines besides: - ANS-Beams supported by means
of a column or wall have to now not be cast till concrete within the vertical helping member
has reached full compressive strength
Core samples may be taken into consideration applicable so long as: - ANS-They are
transported in watertight bins and therapy at least forty eight hours prior to breaking
During the first 24 hours of initial curing for a hard and fast of concrete cylinders with the
design electricity 5,000 psi, the curing temperatures should stay at: - ANS-60 - 80 degrees F
Epoxy-covered bars have to conform to ASTM __________. - ANS-A775
For five,000 f'c concrete, cylinder breaks can be desirable if: - ANS-No single energy check
falls under 4,500 psi
For a project requiring low warmness of hydration at some stage in the curing process, what
sort of cement need to the contractor use? - ANS-Portland Type 4