ACI Grade 1 Field Testing Certification
Practice Test – Irving
For concrete with aggregates less than 3 inches, the thermometer must remain in the
fresh concrete sample a minimum of 5 minutes or until the temperature reading
stabilizes. (T or F) - ANSWER-False (2-5 minutes)
The temperature measuring device must be accurate to within 0.1 degree. (T or F) -
ANSWER-
The elapsed time between the start of filling the slump cone and the removal of the
cone must be no more than: - ANSWER-2 1/2 minutes
The slump should be measured to the nearest - ANSWER-Quarter of an inch
In order to determine slump, you should measure the vertical distance from: -
ANSWER-Top of the mold to the displaced original center of the top surface
The dimensions of the slump cone are: - ANSWER-Top diameter 4 inches, bottom
diameter 8 inches, height 12 inches
In the slump test, if a decided falling away or shearing off the concrete from one side or
portion of the mass occurs upon raising the slump cone, one should: - ANSWER-
Disregard the test and make a new test on another portion of the sample
The slump cone should be struck-off with: - ANSWER-The tamping rod
The slump cone must be placed: - ANSWER-On a flat moist, non-absorbent, rigid
surface
When rodding the second and third layers, the rod should penetrate the preceding layer
by about 1 inch. (T or F) - ANSWER-True
The normal ½ cubic foot bucket may not be used to determine Density (unit weight) of
lightweight concrete. (T or F) - ANSWER-False (0.2 bucket)
Concrete slump of less than 1 inch should be consolidated using a vibrator. (T or F) -
ANSWER-True
, ASTM C138 states, "the minimum capacity of the bucket depends on the maximum
slump requirement." (T or F) - ANSWER-False
According to ASTM C138, after rodding each layer, tap the sides of the container, with
the rod exactly 25 times. (T or F) - ANSWER-False
The outside of the density bucket should be cleaned before weighing. (T or F) -
ANSWER-True
Concrete with a slump less than 1 inch should be rodded 25 times per layer. (T or F) -
ANSWER-False (Use Vibrator)
According to C138, concretes with slumps of 1-3 inches may be compacted with the
vibrator or the rod. (T or F) - ANSWER-True
The unit weight bucket must be calibrated at least once a month. (T or F) - ANSWER-
False
According to ASTM C138, when rodding the bottom layer, the rod shall not forcibly
strike the bottom of the measure. (T or F) - ANSWER-True
The strike-off plate must be: - ANSWER-At least 1/4 inch thick if metal
At least 1/2 inch thick if glass or acrylic
Flat
(All of the above)
Given the following: wt of bucket 16.2 lbs, volume of bucket =0.498 cf, wt of bucket and
concrete 88.5 lbs. - ANSWER-177.2 lb/ft^3
What is the optimum amount of the concrete that should be protruding above the top of
the mold after the third layer has been tapped by the mallet? - ANSWER-About a 1/8th
inch
After strike-off, the next operation is: - ANSWER-Clean the excess concrete from the
exterior of the measure
Strike-off density (unit weight) bucket by: - ANSWER-Using a flat plate in a sawing
motion
If the density (unit weight) of concrete is 146 lb/ft³ and the total batch weight is 35,468
lb., what is the yield? - ANSWER-9.0 yd^3
The tamping, rod used for the unit weight test: - ANSWER-A round, straight steel rod
Has a 5/8 diameter with the tamping end rounded
Is approximately 24 inches in length
(All of the above)
Practice Test – Irving
For concrete with aggregates less than 3 inches, the thermometer must remain in the
fresh concrete sample a minimum of 5 minutes or until the temperature reading
stabilizes. (T or F) - ANSWER-False (2-5 minutes)
The temperature measuring device must be accurate to within 0.1 degree. (T or F) -
ANSWER-
The elapsed time between the start of filling the slump cone and the removal of the
cone must be no more than: - ANSWER-2 1/2 minutes
The slump should be measured to the nearest - ANSWER-Quarter of an inch
In order to determine slump, you should measure the vertical distance from: -
ANSWER-Top of the mold to the displaced original center of the top surface
The dimensions of the slump cone are: - ANSWER-Top diameter 4 inches, bottom
diameter 8 inches, height 12 inches
In the slump test, if a decided falling away or shearing off the concrete from one side or
portion of the mass occurs upon raising the slump cone, one should: - ANSWER-
Disregard the test and make a new test on another portion of the sample
The slump cone should be struck-off with: - ANSWER-The tamping rod
The slump cone must be placed: - ANSWER-On a flat moist, non-absorbent, rigid
surface
When rodding the second and third layers, the rod should penetrate the preceding layer
by about 1 inch. (T or F) - ANSWER-True
The normal ½ cubic foot bucket may not be used to determine Density (unit weight) of
lightweight concrete. (T or F) - ANSWER-False (0.2 bucket)
Concrete slump of less than 1 inch should be consolidated using a vibrator. (T or F) -
ANSWER-True
, ASTM C138 states, "the minimum capacity of the bucket depends on the maximum
slump requirement." (T or F) - ANSWER-False
According to ASTM C138, after rodding each layer, tap the sides of the container, with
the rod exactly 25 times. (T or F) - ANSWER-False
The outside of the density bucket should be cleaned before weighing. (T or F) -
ANSWER-True
Concrete with a slump less than 1 inch should be rodded 25 times per layer. (T or F) -
ANSWER-False (Use Vibrator)
According to C138, concretes with slumps of 1-3 inches may be compacted with the
vibrator or the rod. (T or F) - ANSWER-True
The unit weight bucket must be calibrated at least once a month. (T or F) - ANSWER-
False
According to ASTM C138, when rodding the bottom layer, the rod shall not forcibly
strike the bottom of the measure. (T or F) - ANSWER-True
The strike-off plate must be: - ANSWER-At least 1/4 inch thick if metal
At least 1/2 inch thick if glass or acrylic
Flat
(All of the above)
Given the following: wt of bucket 16.2 lbs, volume of bucket =0.498 cf, wt of bucket and
concrete 88.5 lbs. - ANSWER-177.2 lb/ft^3
What is the optimum amount of the concrete that should be protruding above the top of
the mold after the third layer has been tapped by the mallet? - ANSWER-About a 1/8th
inch
After strike-off, the next operation is: - ANSWER-Clean the excess concrete from the
exterior of the measure
Strike-off density (unit weight) bucket by: - ANSWER-Using a flat plate in a sawing
motion
If the density (unit weight) of concrete is 146 lb/ft³ and the total batch weight is 35,468
lb., what is the yield? - ANSWER-9.0 yd^3
The tamping, rod used for the unit weight test: - ANSWER-A round, straight steel rod
Has a 5/8 diameter with the tamping end rounded
Is approximately 24 inches in length
(All of the above)
