ACI CONCRETE FIELD TESTING
TECHNICIAN- GRADE I
PRACTICE EXAM QUESTIONS WITH
CORRECT DETAILED ANSWERS |
ALREADY GRADED A+<RECENT
VERSION>
1) The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - ANSWER 3 in. [75 mm]
2) The temperature measuring device shall have a capacity of measuring temperature of
freshly mixed concrete to +- _____ degrees F [+- _____ C] throughout a range of
_____. - ANSWER 1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
3) The temperature measuring device shall be calibrated _____, or whenever there is a
question of _____. - ANSWER Annually, accuracy
4) The temperature of concrete may be measured in a wheelbarrow. True or False? -
ANSWER True
5) The temperature of concrete may be measured in a wall form. True of False -
ANSWER True
6) A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - ANSWER False
7) What must be done to the sample container prior to sampling the concrete? -
ANSWER Dampen (with water)
,8) What must be done to the concrete surrounding the temperature measuring device
after the device is submerged in the fresh concrete. - ANSWER Gently press the
concrete around the temperature measuring device at the surface of the concrete
9) 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
10) The slump test is applicable to plastic concrete with a maximum size aggregate of
_____. - ANSWER 1.5 in.
11) 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. sieve
12) The mold for making the slump test is in the shape of _____. - ANSWER The
frustum of a cone
13) The height of the slump mold is _____. - ANSWER 12 in. [300 mm]
14) The interior surface of the slump mold is allowed to have minor irregularities. True or
False? - ANSWER False
15) For use in the slump test, the end or both ends of the tamping rod must be _____. -
ANSWER Rounded to a hemispherical tip
16) The sample of concrete for use in making the slump test must be obtained in
accordance with ASTM Standard _____. - ANSWER C172, Standard Practice for
Sampling Freshly Mixed Concrete
17) The slump mold should be in a dry condition before beginning the test. True or False?
- ANSWER False
,18) The surface on which the slump mold will be placed must be _____. - ANSWER
Flat, level, moist, non absorbent, and free of vibration
19) The slump mold is filled in _____ layers. - ANSWER 3
20) Each layer should fill approximately _____ the volume of the mold. - ANSWER
One-third
21) The approximate concrete depth (in verticle distance) after placing the first layer is
_____, and the second layer is _____. - ANSWER 2 5/8 in., 6 1/8 in.
22) 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.
23) When rodding the bottom layer, the tamping rod must be _____ to uniformly
distribute the strokes. - ANSWER Slightly inclined
24) 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
25) Prior to lifting the mold, concrete must be removed from _____. - ANSWER The
area surrounding the base of the mold
26) After the final rodding, the sides of the slump mold should be tapped lightly with the
tamping rod. True or False? - ANSWER False
27) When raising the slump mold, it should not be rotated or twisted, True or False? -
ANSWER True
28) How much time is allowed for lifting the slump mold ? - ANSWER 5 +- 2 seconds
, 29) 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
30) The slump of the concrete is measured and reported to the nearest _____. -
ANSWER 1/4 in.
31) How much time is allowed to conduct the slump test from beginning to completion? -
ANSWER 2 1/2 minutes
32) The diameter of the tamping rod used in the Slump test is _____. - ANSWER 5/8
in.
33) What is the required shape of the tamping end of the rod? - ANSWER Rounded to
a hemispherical tip
34) A plastic container can be used for the measure in unit weight. True or False? -
ANSWER False, measure must be steel or another suitable metal
35) What is the required minimum frequency of the vibrator used in Unit Weight test
method? - ANSWER 9000 vibrations per minute
36) What is the minimum thickness of a metal strike-off plate? - ANSWER 1/4 in.
37) What is the minimum thickness for a glass or acrylic strike-off plate? - ANSWER
1/2 in.
38) What is the specified weight of the mallet used on measures that are 0.5 ft^3 or
smaller? - ANSWER 1.25 lbs.
39) What method of consolidation must be used when the slump is greater than 3 in.? -
ANSWER Rodding
TECHNICIAN- GRADE I
PRACTICE EXAM QUESTIONS WITH
CORRECT DETAILED ANSWERS |
ALREADY GRADED A+<RECENT
VERSION>
1) The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - ANSWER 3 in. [75 mm]
2) The temperature measuring device shall have a capacity of measuring temperature of
freshly mixed concrete to +- _____ degrees F [+- _____ C] throughout a range of
_____. - ANSWER 1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
3) The temperature measuring device shall be calibrated _____, or whenever there is a
question of _____. - ANSWER Annually, accuracy
4) The temperature of concrete may be measured in a wheelbarrow. True or False? -
ANSWER True
5) The temperature of concrete may be measured in a wall form. True of False -
ANSWER True
6) A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - ANSWER False
7) What must be done to the sample container prior to sampling the concrete? -
ANSWER Dampen (with water)
,8) What must be done to the concrete surrounding the temperature measuring device
after the device is submerged in the fresh concrete. - ANSWER Gently press the
concrete around the temperature measuring device at the surface of the concrete
9) 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
10) The slump test is applicable to plastic concrete with a maximum size aggregate of
_____. - ANSWER 1.5 in.
11) 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. sieve
12) The mold for making the slump test is in the shape of _____. - ANSWER The
frustum of a cone
13) The height of the slump mold is _____. - ANSWER 12 in. [300 mm]
14) The interior surface of the slump mold is allowed to have minor irregularities. True or
False? - ANSWER False
15) For use in the slump test, the end or both ends of the tamping rod must be _____. -
ANSWER Rounded to a hemispherical tip
16) The sample of concrete for use in making the slump test must be obtained in
accordance with ASTM Standard _____. - ANSWER C172, Standard Practice for
Sampling Freshly Mixed Concrete
17) The slump mold should be in a dry condition before beginning the test. True or False?
- ANSWER False
,18) The surface on which the slump mold will be placed must be _____. - ANSWER
Flat, level, moist, non absorbent, and free of vibration
19) The slump mold is filled in _____ layers. - ANSWER 3
20) Each layer should fill approximately _____ the volume of the mold. - ANSWER
One-third
21) The approximate concrete depth (in verticle distance) after placing the first layer is
_____, and the second layer is _____. - ANSWER 2 5/8 in., 6 1/8 in.
22) 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.
23) When rodding the bottom layer, the tamping rod must be _____ to uniformly
distribute the strokes. - ANSWER Slightly inclined
24) 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
25) Prior to lifting the mold, concrete must be removed from _____. - ANSWER The
area surrounding the base of the mold
26) After the final rodding, the sides of the slump mold should be tapped lightly with the
tamping rod. True or False? - ANSWER False
27) When raising the slump mold, it should not be rotated or twisted, True or False? -
ANSWER True
28) How much time is allowed for lifting the slump mold ? - ANSWER 5 +- 2 seconds
, 29) 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
30) The slump of the concrete is measured and reported to the nearest _____. -
ANSWER 1/4 in.
31) How much time is allowed to conduct the slump test from beginning to completion? -
ANSWER 2 1/2 minutes
32) The diameter of the tamping rod used in the Slump test is _____. - ANSWER 5/8
in.
33) What is the required shape of the tamping end of the rod? - ANSWER Rounded to
a hemispherical tip
34) A plastic container can be used for the measure in unit weight. True or False? -
ANSWER False, measure must be steel or another suitable metal
35) What is the required minimum frequency of the vibrator used in Unit Weight test
method? - ANSWER 9000 vibrations per minute
36) What is the minimum thickness of a metal strike-off plate? - ANSWER 1/4 in.
37) What is the minimum thickness for a glass or acrylic strike-off plate? - ANSWER
1/2 in.
38) What is the specified weight of the mallet used on measures that are 0.5 ft^3 or
smaller? - ANSWER 1.25 lbs.
39) What method of consolidation must be used when the slump is greater than 3 in.? -
ANSWER Rodding
