ACI WRITTEN EXAM SCRIPT 2026 TESTED
QUESTIONS WITH DETAILED SOLUTIONS
GRADED A+
◉ ASTM C172 - This method covers sampling from four types of
mixers, which are _____. Answer: Stationary mixers, paving mixers,
revolving drum mixers, and open top mixers
◉ ASTM C172 - The maximum allowable time between obtaining the
first and final portions of a composite sample is ______ minutes.
Answer: 15 mninutes
◉ ASTM C172 - Portions of a composite sample shall be thoroughly
remixed before beginning tests on the sample.(T/F). Answer: True
◉ ASTM C172 - The maximum elapsed time allowed between obtaining
the final portion of the composite sample and beginning the tests for
slump, temperature and air content is ________ minutes. Answer: 5
minutes
◉ ASTM C172 - The molding of strength test specimens shall begin
within ____ minutes after fabricating the sample. Answer: 15 minutes
,◉ ASTM C172 - The concrete sample must be protected from
contamination and ______. Answer: Rapid evaporation
◉ ASTM C172 - The minimum size sample for making strength test
specimens is ________. Answer: 1.0 cubic foot / 28L
◉ ASTM C172 - When sampling from a stationary mixer, the batch
must be sampled at _____ or more regularly spaced intervals during
discharge of the batch. Answer: 2
◉ ASTM C172 - The composite sample for a paving mixer must
represent a minimum of ___ different portions of the batch of concrete
taken from the pile after discharge. Answer: 5
◉ ASTM C172 - When sampling from a revolving drum truck mixer,
concrete must be sampled at a minimum of ____ regularly spaced
intervals during discharge of the batch. Answer: 2
◉ ASTM C172 - Concrete samples from a truck mixer must be obtained
before any water is added to the mixer at the job site. (True or False).
Answer: False
◉ ASTM C172 - The composite sample from a truck mixer must be
obtained from the ______ portion of the batch. Answer: Middle
, ◉ ASTM C172 - When the concrete contains aggregate larger than that
permitted for a particular test method, the sample of concrete must be
____ ____ before making the test. Answer: Wet sieved
◉ ASTM C143 - The slump test is applicable to plastic concrete with a
maximum size aggregate of _____. Answer: 1-1/2 inch
◉ ASTM C143 - When the concrete contains aggregate larger than
allowed for the slump test, the large aggregate must be ____. Answer:
Removed by wet sieving the sample over 1-1/2 inch sieve
◉ ASTM C143 - The mold for making the slump tests is in the shape of
______. Answer: The frustum of a cone
◉ ASTM C143 - The height of the slump mold is ______. Answer: 12
inches
◉ ASTM C143 - The interior surface of the slump mold is allowed to
have minor irregularities. (True or False). Answer: False
◉ ASTM C143 - For use in the slump test, the end or both ends of the
tamping rod must be _____. Answer: Rounded to a hemispherical tip
QUESTIONS WITH DETAILED SOLUTIONS
GRADED A+
◉ ASTM C172 - This method covers sampling from four types of
mixers, which are _____. Answer: Stationary mixers, paving mixers,
revolving drum mixers, and open top mixers
◉ ASTM C172 - The maximum allowable time between obtaining the
first and final portions of a composite sample is ______ minutes.
Answer: 15 mninutes
◉ ASTM C172 - Portions of a composite sample shall be thoroughly
remixed before beginning tests on the sample.(T/F). Answer: True
◉ ASTM C172 - The maximum elapsed time allowed between obtaining
the final portion of the composite sample and beginning the tests for
slump, temperature and air content is ________ minutes. Answer: 5
minutes
◉ ASTM C172 - The molding of strength test specimens shall begin
within ____ minutes after fabricating the sample. Answer: 15 minutes
,◉ ASTM C172 - The concrete sample must be protected from
contamination and ______. Answer: Rapid evaporation
◉ ASTM C172 - The minimum size sample for making strength test
specimens is ________. Answer: 1.0 cubic foot / 28L
◉ ASTM C172 - When sampling from a stationary mixer, the batch
must be sampled at _____ or more regularly spaced intervals during
discharge of the batch. Answer: 2
◉ ASTM C172 - The composite sample for a paving mixer must
represent a minimum of ___ different portions of the batch of concrete
taken from the pile after discharge. Answer: 5
◉ ASTM C172 - When sampling from a revolving drum truck mixer,
concrete must be sampled at a minimum of ____ regularly spaced
intervals during discharge of the batch. Answer: 2
◉ ASTM C172 - Concrete samples from a truck mixer must be obtained
before any water is added to the mixer at the job site. (True or False).
Answer: False
◉ ASTM C172 - The composite sample from a truck mixer must be
obtained from the ______ portion of the batch. Answer: Middle
, ◉ ASTM C172 - When the concrete contains aggregate larger than that
permitted for a particular test method, the sample of concrete must be
____ ____ before making the test. Answer: Wet sieved
◉ ASTM C143 - The slump test is applicable to plastic concrete with a
maximum size aggregate of _____. Answer: 1-1/2 inch
◉ ASTM C143 - When the concrete contains aggregate larger than
allowed for the slump test, the large aggregate must be ____. Answer:
Removed by wet sieving the sample over 1-1/2 inch sieve
◉ ASTM C143 - The mold for making the slump tests is in the shape of
______. Answer: The frustum of a cone
◉ ASTM C143 - The height of the slump mold is ______. Answer: 12
inches
◉ ASTM C143 - The interior surface of the slump mold is allowed to
have minor irregularities. (True or False). Answer: False
◉ ASTM C143 - For use in the slump test, the end or both ends of the
tamping rod must be _____. Answer: Rounded to a hemispherical tip
