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__________ reinforcing steel bars not only have a differing chemical composition,
but are considered weldable.
AnswerA706
28-Day acceptance of strength is the average of:
Answer(3) 4 x 8 cylinders or (2) 6 x 12 cylinders
A ____ is a horizontal member that transfers loads laterally.
AnswerBeam
A beam is primarily subject to _____ while a column is primarily subject to
______.
AnswerFlexure, compression
A concrete mix design specifies a water/cement ratio of 0.45 maximum. When
batched, a particular load has a water/cement ratio of 0.38. Which of the following
statements is true?
AnswerThe compressive strength will likely be higher than normal.
A grade 60 bar has
AnswerA minimum yield strength of 60,000 psi
A low-alloy steel bar conforms to
AnswerASTM A706
A mechanical splice must achieve
Answer125% of the grade strength of the bar
Adding water to a concrete mix will:
AnswerDecrease the compressive strength
Additional revolutions of a drum mixer filled with concrete __________ the slump
and __________ the entrained air.
Answerdecrease, decrease
, After initial curing is complete, sample cylinders should be maintained at a
temperature between:
Answer73.5 +/- 3.5 degrees
Air content required for a 5,000 psi, 3/8 inch aggregate mix of concrete exposed to
very severe cycles of freezing and thawing is:
Answer7.5%
Air-entraining admixtures must conform to:
AnswerASTM C260
Aluminum embedments in structural concrete are:
AnswerPermitted only if coated or covered to prevent an aluminum-concrete
reaction
An acceptable reinforcing steel support mechanism for a 24-inch deep footing
includes:
Answerprecast dobie blocks
An ASTM A615 #7 bar has the diameter of
Answer7/8 of an inch (#22)
As a general rule, lap splicing bars larger than No. 11 is
Answernot permitted
Bars must be tied in place to avoid displacement during concrete placement. The
following is not acceptable for securing rebar intersections:
Answerwelding
Before new concrete is placed, construction joints must be:
Answerwetted, and standing water removed
Bundled bars can have a maximum of ____ bars bundled together.
Answer4
Concrete can be placed into its intended structure unless:
AnswerIt has segregated