ACI WRITTEN COMPREHENSIVE EXAM 2026
UPDATED QUESTIONS AND ANSWERS
GUARANTEED PASS
◉ 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
UPDATED QUESTIONS AND ANSWERS
GUARANTEED PASS
◉ 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
