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ACI Exam Section 7 Exam Questions with Answers
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ACI Exam Section 7 Exam Questionswith Answers
Practice C31 gives standardized requirements for _____, ______, ______, and
______ of test specimens. - -making, curing, protecting, transporting
-For cylinders with a diameter of 6 in. [150 mm] or greater, the tamping rod
must be a round, straight steel rod with a diameter of _____. - -5/8 +/- 1/16
in
-The minimum frequency of an internal vibrator used in this procedure is
_____. - -9000 vibrations/minute (150 Hz)
-The container for obtaining the concrete sample used in this procedure can
be a ___, or ___. - -Metal pan; wheelbarrow; flat, clean nonabsorbent mixing
board
-A 150 by 300 mm (6 by 12 in) cylinder mold can be used for concrete
containing aggregate with particles not exceeding ___ in size, without the
need for wet sieving the concrete. - -2 in (50 mm)
-The sample of concrete used in molding test specimens must be obtained
in accordance with what ASTM practice? - -C172
-When strenght specimens are to be made, what three other tests must be
made? - -Slump, air content, temperature
-The supporting surface on which specimens are stored shall be level within
_____. - -1/4 in / ft
-For concrete with a slump of less than 1 in. [25 mm], the test specimens
must be consolidated by _____. - -vibration
-If the concrete is to be consolidated by vibration, a standard 4 by 8 in. [100
mm by 200 mm] cylinder mold must be filled in _____ equal layers. - -two
-When rodding a standard 6" by 12" cylinder, each layer must be rodded
_____ times. - -25
-When rodding each upper layer of concrete in a cylinder, the tamping rod
should penetrate into the underlying layer by about _____. - -1 in
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