Exam (elaborations)
ACI WRITTEN TEST EXAM 2024
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ACI WRITTEN TEST EXAM 2024
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ACI WRITTEN TEST EXAM 2024(ASTM C31): How big must tamping rods be for molds less than 6" diameter/width -
ANSWER 3/8" diameter
Pressure test is good for _____ aggregates. Volumetric test is good for _____ -
ANSWER dense; any type of aggregate (dense, cellular, or lightweight)
(ASTM C173): measuring bowl shall have diameter ______times the height -
ANSWER 1-1.25times
(ASTM C173): measuring bowls shall not have a capactiy of less than __L -
ANSWER 2
(ASTM C173): the top section shall have a capacity of at least __% larger than the
measuring bowl - ANSWER 20
(ASTM C173): the top section shall be equipped with a transparent scale, graduated
in increments not greater than 0.5% from - ANSWER 0 to 9%
(ASTM C173): the funnel should be long enough to ________ - ANSWER extend to
a point just above the bottom of the top section
(ASTM C173): the discharge end of the spout shall be so constructed that when
water is added there will be ________ - ANSWER a minimum disturbance of the
concrete
(ASTM C173): alcohol vessel with minimum capacity of at least __pint with
graduations not larger than __mL. Rubber syringe having capacity of ____mL. Water
container of __L capacity - ANSWER 1; 50; 1
(ASTM C173): use __% by volume isopropyl alcohol. Other foam-dispersing agents
are permitted if air content doesn't change more than ___%. Mallet with mass of
__lbs - ANSWER 70; 0.1; 1.25
(ASTM C173): if aggregates would be retained on a 1-1/2inch sieve, then wet sieve
over a __inch sieve - ANSWER 1
(ASTM C173): if more than ___L of alcohol is used a correction to the final meter is
required. ROund the volume of alcohol to the nearest ___L - ANSWER 1.25; 0.5
(ASTM C173): Air content equals - ANSWER final meter reading % (AR)-Correction
factor (C)+W(number of added calibrated cups of water
(ASTM C173): this test is not affected by air that may be present inside _________ -
ANSWER porous aggregate particles
, (ASTM C31): How many vibrations/min must vibrators produce? - ANSWER
9000vib/min
(ASTM C31): Vibrating element must be no bigger than_____ the cylinder diameter -
ANSWER 1/4th
(ASTM C31): Vibrators must be used for slumps _____" or less - ANSWER 1"
(ASTM C31): When rodding a 4" diameter cylinder fill in ___ layers; When rodding a
6" diameter cylinder fill in ___ layers - ANSWER 2; 3
(ASTM C31): How many times do tap outside of mold? - ANSWER 10-15 times with
mallet or hand for cylinder mold
(ASTM C31): How long do you insert rod or vibrator in lift? - ANSWER 1"
(ASTM C31): Cylinder must be at least ___ times the size of the coarse aggregate -
ANSWER 3
(ASTM C31): Aggregate larger than ___" must be wet-sieved out of the mix -
ANSWER 2"
(ASTM C31): Cylinder molds must be ______ the length of the diameter - ANSWER
twice
(ASTM C31): When rodding beams, fill in __ layers for beam widths 6-8"; fill in __
layers for beam widths greater than 8" - ANSWER 2; 3 or more
(ASTM C31): When vibrating beams, fill in __ layers for beam widths 6-8"; fill in __
layers for beam widths greater than 8" - ANSWER 1; 2 or more
(ASTM C31): Beams must be at least _____ times the size of the coarse aggregate
in the smallest cross section - ANSWER 3
(ASTM C31): Beam molds length must be at least __" greater than __ times the
depth - ANSWER 2"; 3
(ASTM C31): Beam mold width must not exceed __ times the depth - ANSWER 1.5
(ASTM C31): Depths and widths for beam molds must be at least __" - ANSWER
6"
(ASTM C31): When planning to mold and cure concrete specimens it is required that
which tests are to be performed? - ANSWER slump, temp., and air content if there
is air entrainer
(ASTM C31): During initial curing what temperature must the cylinders be stored in
and what environment? - ANSWER 60-80 degrees F and an environment that
prevents moisture loss for up to 48 hours
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