ACI EXAMINATION TEST 2026 QUESTIONS
AND SOLUTIONS GRADED A+
◉When sampling from a revolving drum truck mixer, concrete must
be sampled at a minimum of _____ regularly spaced intervals during
discharge of the middle portion of this batch. Answer: 2
◉Concrete samples from a truck mixer must be obtained before any
water or admixtures are added to the mixer at the job site. True or
False? Answer: False
◉The composite samples from a truck mixer must be obtained from
the _____ portion of the batch. Answer: Middle
◉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
◉The slump test is applicable to plastic concrete with a maximum
size aggregate of _____. Answer: 1.5 in. [37.5 mm]
,◉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 1.5 in. [37.5 mm] sieve
◉The mold for making the slump test is in the shape of _____.
Answer: The frustum of a cone
◉The height of the slump mold is _____. Answer: 12 in. [300 mm]
◉The interior surface of the slump mold is allowed to have minor
irregularities. True or False? Answer: False
◉For use in the slump test, the end or both ends of the tamping rod
must be _____. Answer: Rounded to a hemispherical tip
◉The sample of concrete for use in making the slump test must be
obained in accordance with ASTM Standard _____. Answer: C172,
Standard Practice for Sampling Freshly Mixed Concrete
◉The slump mold should be in a dry condition before beginning the
test. True or False? Answer: False
◉The surface on which the slump mold will be placed must be _____.
Answer: Flat, level, moist, nonabsorbent, and free of vibration
, ◉The slump mold is filled in _____ layers. Answer: 3
◉Each layer should fill approximately _____ the volume of the mold.
Answer: One-third
◉The approximate concrete depth (in verticle distance) after
placing the first layer is _____, and the second layer is _____. Answer: 2
5/8 in. [70 mm], 6 1/8 in. [160 mm]
◉What is the specified number of roddings for each layer? Answer:
25
◉How deep should the tamping rod penetrate into each layer?
Answer: Rod each layer throughout its depth; on the second and
final layers, the rod should penetrate into the previous layer
approximately 1 in. [25 mm]
◉When rodding the bottom layer, the tamping rod must be _____ to
uniformly distribute the strokes. Answer: Slightly inclined
◉What must be done if the concrete drops below the top of the
slump mold while the top layer is being rodded? Answer: Add
additional concrete to keep an excess of concrete above the top of
the mold at all times
AND SOLUTIONS GRADED A+
◉When sampling from a revolving drum truck mixer, concrete must
be sampled at a minimum of _____ regularly spaced intervals during
discharge of the middle portion of this batch. Answer: 2
◉Concrete samples from a truck mixer must be obtained before any
water or admixtures are added to the mixer at the job site. True or
False? Answer: False
◉The composite samples from a truck mixer must be obtained from
the _____ portion of the batch. Answer: Middle
◉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
◉The slump test is applicable to plastic concrete with a maximum
size aggregate of _____. Answer: 1.5 in. [37.5 mm]
,◉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 1.5 in. [37.5 mm] sieve
◉The mold for making the slump test is in the shape of _____.
Answer: The frustum of a cone
◉The height of the slump mold is _____. Answer: 12 in. [300 mm]
◉The interior surface of the slump mold is allowed to have minor
irregularities. True or False? Answer: False
◉For use in the slump test, the end or both ends of the tamping rod
must be _____. Answer: Rounded to a hemispherical tip
◉The sample of concrete for use in making the slump test must be
obained in accordance with ASTM Standard _____. Answer: C172,
Standard Practice for Sampling Freshly Mixed Concrete
◉The slump mold should be in a dry condition before beginning the
test. True or False? Answer: False
◉The surface on which the slump mold will be placed must be _____.
Answer: Flat, level, moist, nonabsorbent, and free of vibration
, ◉The slump mold is filled in _____ layers. Answer: 3
◉Each layer should fill approximately _____ the volume of the mold.
Answer: One-third
◉The approximate concrete depth (in verticle distance) after
placing the first layer is _____, and the second layer is _____. Answer: 2
5/8 in. [70 mm], 6 1/8 in. [160 mm]
◉What is the specified number of roddings for each layer? Answer:
25
◉How deep should the tamping rod penetrate into each layer?
Answer: Rod each layer throughout its depth; on the second and
final layers, the rod should penetrate into the previous layer
approximately 1 in. [25 mm]
◉When rodding the bottom layer, the tamping rod must be _____ to
uniformly distribute the strokes. Answer: Slightly inclined
◉What must be done if the concrete drops below the top of the
slump mold while the top layer is being rodded? Answer: Add
additional concrete to keep an excess of concrete above the top of
the mold at all times
