ACI CONCRETE FIELD TESTING TECHNICIAN EXAM AND STUDY
GUIDE 150 QUESTIONS AND CORRECT ANSWERS 2024 LATEST
GRADED A+
When sampling from a stationary mixer, the batch must be sampled at _____ or more regularly spaced
intervals during discharge of the middle portion of the batch - ANSWER-2
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
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? -
ANSWERFalse
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
Prior to lifting the mold, concrete must be removed from _____. - ANSWER-The area surrounding
the base of the mold
After the final rodding, the sides of the slump mold should should be tapped lightly with the tamping
rod. True or False? - ANSWER-False
When raising the slump mold, it should not be rotated or twisted, True or False? - ANSWER-True
How much time is allowed for lifting the slump mold? - ANSWER-5 +- 2 seconds
The measurement for slump is made from the top of the mold to what point of the concrete specimen?
- ANSWER-The displaced original center of the top surface of the specimen
The slump of the concrete is measured and reported to the nearest _____. - ANSWER-1/4 in. [5
mm]
GUIDE 150 QUESTIONS AND CORRECT ANSWERS 2024 LATEST
GRADED A+
When sampling from a stationary mixer, the batch must be sampled at _____ or more regularly spaced
intervals during discharge of the middle portion of the batch - ANSWER-2
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
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? -
ANSWERFalse
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
Prior to lifting the mold, concrete must be removed from _____. - ANSWER-The area surrounding
the base of the mold
After the final rodding, the sides of the slump mold should should be tapped lightly with the tamping
rod. True or False? - ANSWER-False
When raising the slump mold, it should not be rotated or twisted, True or False? - ANSWER-True
How much time is allowed for lifting the slump mold? - ANSWER-5 +- 2 seconds
The measurement for slump is made from the top of the mold to what point of the concrete specimen?
- ANSWER-The displaced original center of the top surface of the specimen
The slump of the concrete is measured and reported to the nearest _____. - ANSWER-1/4 in. [5
mm]
