ACI CONCRETE FIELD-TESTING TECHNICIAN GRADE I:
COMPLETE 200-QUESTION COMPREHENSIVE PRACTICE
EXAMINATION COVERING ASTM C143, C172, C231, C173,
C138, C1064, AND C31 WITH DETAILED RATIONALES FOR
CERTIFICATION READINESS.
Question 1 – Sampling: Time Limits
What is the maximum allowable time from obtaining the final portion of
the composite sample to the start of tests for slump and air content?
A) 2.5 minutes
B) 5 minutes
C) 10 minutes
D) 15 minutes
Correct Answer: B
Rationale: ASTM C172 requires that tests for slump, temperature, and
air content, as well as molding of specimens for strength tests, must be
started within 5 minutes of obtaining the final portion of the composite
sample.
Question 2 – Temperature: Device Requirements
The temperature measuring device used for freshly mixed concrete
must have what minimum range and accuracy?
A) Range of 0°F to 200°F, accurate to ±1°F
B) Range of 30°F to 120°F, accurate to ±1°F
,C) Range of 0°F to 150°F, accurate to ±2°F
D) Range of 30°F to 212°F, accurate to ±0.5°F
Correct Answer: B
Rationale: The temperature measuring device must have a range of
30°F to 120°F and be accurate to ±1°F for testing freshly mixed
hydraulic-cement concrete.
Question 3 – Slump Test: Equipment
What are the required dimensions of the slump cone?
A) Base diameter 8 in., top diameter 4 in., height 12 in.
B) Base diameter 10 in., top diameter 6 in., height 12 in.
C) Base diameter 8 in., top diameter 4 in., height 16 in.
D) Base diameter 6 in., top diameter 4 in., height 12 in.
Correct Answer: A
Rationale: The slump cone has a base diameter of 8 inches, a top
diameter of 4 inches, and a height of 12 inches.
Question 4 – Density (Unit Weight): Calculation
The density (unit weight) of concrete is calculated by dividing the net
weight of the concrete by which value?
A) The weight of the measure plus concrete minus the weight of the
measure
B) The volume of the measure
C) The weight of the water required to fill the measure
D) The air content of the concrete
,Correct Answer: B
Rationale: Density is calculated by dividing the net weight of the
concrete (weight of measure filled with concrete minus weight of empty
measure) by the volume of the measure.
Question 5 – Air Content (Pressure Method): Initial Air
Before applying pressure to the air meter, what must be done to the
concrete sample?
A) It must be rodded 25 times per layer
B) It must be consolidated in two equal layers
C) It must be placed in the measuring bowl in three layers
D) It must be rodded 25 times total, not per layer
Correct Answer: C
Rationale: The concrete is placed in the measuring bowl in three layers
of approximately equal volume, with each layer rodded 25 times.
Question 6 – Sampling: Composite Sample
A composite sample of concrete must consist of at least how many
increments taken from the middle portion of the batch?
A) One
B) Two
C) Three
D) Four
Correct Answer: B
, Rationale: The composite sample must consist of at least two
increments taken from the middle portion of the batch.
Question 7 – Slump Test: Filling
When filling the slump cone, each layer should be rodded how many
times?
A) 15 strokes per layer
B) 20 strokes per layer
C) 25 strokes per layer
D) 30 strokes per layer
Correct Answer: C
Rationale: Each of the three layers of the slump cone is rodded 25 times
with the tamping rod.
Question 8 – Temperature: Submersion Depth
The sensor of the temperature measuring device must be submerged a
minimum of how many inches into the freshly mixed concrete?
A) 1 in.
B) 2 in.
C) 3 in.
D) 4 in.
Correct Answer: C
Rationale: The sensor of the temperature measuring device must be
submerged a minimum of 3 inches into the freshly mixed concrete.
COMPLETE 200-QUESTION COMPREHENSIVE PRACTICE
EXAMINATION COVERING ASTM C143, C172, C231, C173,
C138, C1064, AND C31 WITH DETAILED RATIONALES FOR
CERTIFICATION READINESS.
Question 1 – Sampling: Time Limits
What is the maximum allowable time from obtaining the final portion of
the composite sample to the start of tests for slump and air content?
A) 2.5 minutes
B) 5 minutes
C) 10 minutes
D) 15 minutes
Correct Answer: B
Rationale: ASTM C172 requires that tests for slump, temperature, and
air content, as well as molding of specimens for strength tests, must be
started within 5 minutes of obtaining the final portion of the composite
sample.
Question 2 – Temperature: Device Requirements
The temperature measuring device used for freshly mixed concrete
must have what minimum range and accuracy?
A) Range of 0°F to 200°F, accurate to ±1°F
B) Range of 30°F to 120°F, accurate to ±1°F
,C) Range of 0°F to 150°F, accurate to ±2°F
D) Range of 30°F to 212°F, accurate to ±0.5°F
Correct Answer: B
Rationale: The temperature measuring device must have a range of
30°F to 120°F and be accurate to ±1°F for testing freshly mixed
hydraulic-cement concrete.
Question 3 – Slump Test: Equipment
What are the required dimensions of the slump cone?
A) Base diameter 8 in., top diameter 4 in., height 12 in.
B) Base diameter 10 in., top diameter 6 in., height 12 in.
C) Base diameter 8 in., top diameter 4 in., height 16 in.
D) Base diameter 6 in., top diameter 4 in., height 12 in.
Correct Answer: A
Rationale: The slump cone has a base diameter of 8 inches, a top
diameter of 4 inches, and a height of 12 inches.
Question 4 – Density (Unit Weight): Calculation
The density (unit weight) of concrete is calculated by dividing the net
weight of the concrete by which value?
A) The weight of the measure plus concrete minus the weight of the
measure
B) The volume of the measure
C) The weight of the water required to fill the measure
D) The air content of the concrete
,Correct Answer: B
Rationale: Density is calculated by dividing the net weight of the
concrete (weight of measure filled with concrete minus weight of empty
measure) by the volume of the measure.
Question 5 – Air Content (Pressure Method): Initial Air
Before applying pressure to the air meter, what must be done to the
concrete sample?
A) It must be rodded 25 times per layer
B) It must be consolidated in two equal layers
C) It must be placed in the measuring bowl in three layers
D) It must be rodded 25 times total, not per layer
Correct Answer: C
Rationale: The concrete is placed in the measuring bowl in three layers
of approximately equal volume, with each layer rodded 25 times.
Question 6 – Sampling: Composite Sample
A composite sample of concrete must consist of at least how many
increments taken from the middle portion of the batch?
A) One
B) Two
C) Three
D) Four
Correct Answer: B
, Rationale: The composite sample must consist of at least two
increments taken from the middle portion of the batch.
Question 7 – Slump Test: Filling
When filling the slump cone, each layer should be rodded how many
times?
A) 15 strokes per layer
B) 20 strokes per layer
C) 25 strokes per layer
D) 30 strokes per layer
Correct Answer: C
Rationale: Each of the three layers of the slump cone is rodded 25 times
with the tamping rod.
Question 8 – Temperature: Submersion Depth
The sensor of the temperature measuring device must be submerged a
minimum of how many inches into the freshly mixed concrete?
A) 1 in.
B) 2 in.
C) 3 in.
D) 4 in.
Correct Answer: C
Rationale: The sensor of the temperature measuring device must be
submerged a minimum of 3 inches into the freshly mixed concrete.
