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ACI Concrete Field Testing Technician
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
___________________________________________________________________
1. What is the primary purpose of ACI Concrete Field Testing Technician Grade
I certification?
A. To design structural concrete members
B. To perform and report specified field tests on freshly mixed concrete
C. To supervise concrete batch-plant operations
D. To perform laboratory chemical analysis
Answer: B. To perform and report specified field tests on freshly mixed concrete
Rationale: ACI Concrete Field Testing Technician Grade I focuses on properly
performing standardized field tests on freshly mixed concrete, including
sampling, temperature, slump, density (unit weight), and air content.
2. When obtaining a sample of freshly mixed concrete, what is the most
important consideration?
A. Take the sample only from the beginning of discharge
B. Take the sample from the first concrete discharged
C. Obtain a representative sample of the concrete
D. Take only the mortar portion
,Answer: C. Obtain a representative sample of the concrete
Rationale: A representative sample ensures that test results accurately reflect
the concrete being delivered and tested.
3. According to standard concrete sampling practice, a sample should
generally be obtained after what portion of the batch has been discharged?
A. Before discharge begins
B. After approximately 10% and before 90% of the batch has been discharged
C. Only during the final 10%
D. After all concrete has been discharged
Answer: B. After approximately 10% and before 90% of the batch has been
discharged
Rationale: Sampling within this portion of discharge helps produce a
representative sample rather than material that may not reflect the batch as a
whole.
4. What should be done with a concrete sample before testing begins?
A. Add water to restore slump
B. Protect it from contamination and excessive moisture loss
C. Allow it to segregate
D. Add cement paste
Answer: B. Protect it from contamination and excessive moisture loss
Rationale: The sample must be protected and maintained in a condition
representative of the concrete as delivered.
5. What is the standard test used to determine the consistency of freshly
mixed concrete?
A. Air-content test
B. Slump test
,C. Density test
D. Temperature test
Answer: B. Slump test
Rationale: The slump test measures the consistency of freshly mixed concrete
and provides an indication of its relative workability.
6. What equipment is used to perform the conventional concrete slump test?
A. Pressure meter
B. Slump cone
C. Graduated cylinder
D. Compression machine
Answer: B. Slump cone
Rationale: The slump cone, also called the slump mold, is the standardized mold
used for the slump test.
7. How many equal-volume layers are used when filling the slump mold?
A. Two
B. Three
C. Four
D. Five
Answer: C. Four
Rationale: The slump mold is filled in four approximately equal-volume layers,
with each layer rodded as specified.
8. How many times is each layer rodded during the conventional slump test?
A. 10 times
B. 15 times
C. 20 times
D. 25 times
, Answer: D. 25 times
Rationale: Each of the four layers is rodded 25 times using the specified tamping
rod.
9. What is the purpose of rodding each layer during the slump test?
A. To increase cement content
B. To consolidate the concrete uniformly
C. To remove all air from the concrete
D. To increase the slump
Answer: B. To consolidate the concrete uniformly
Rationale: Rodding consolidates each layer in a consistent manner so that the
test can be performed reproducibly.
10.How should the slump mold be positioned during the test?
A. On a soft surface
B. On a level, rigid, nonabsorbent surface
C. On freshly placed concrete
D. On a sloped surface
Answer: B. On a level, rigid, nonabsorbent surface
Rationale: A proper testing surface helps prevent movement of the mold and
provides consistent test conditions.
11.How should the slump mold be removed?
A. Slowly while twisting
B. Straight upward without lateral or twisting motion
C. By pushing it sideways
D. By lifting one side first
Answer: B. Straight upward without lateral or twisting motion
ACI Concrete Field Testing Technician
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
___________________________________________________________________
1. What is the primary purpose of ACI Concrete Field Testing Technician Grade
I certification?
A. To design structural concrete members
B. To perform and report specified field tests on freshly mixed concrete
C. To supervise concrete batch-plant operations
D. To perform laboratory chemical analysis
Answer: B. To perform and report specified field tests on freshly mixed concrete
Rationale: ACI Concrete Field Testing Technician Grade I focuses on properly
performing standardized field tests on freshly mixed concrete, including
sampling, temperature, slump, density (unit weight), and air content.
2. When obtaining a sample of freshly mixed concrete, what is the most
important consideration?
A. Take the sample only from the beginning of discharge
B. Take the sample from the first concrete discharged
C. Obtain a representative sample of the concrete
D. Take only the mortar portion
,Answer: C. Obtain a representative sample of the concrete
Rationale: A representative sample ensures that test results accurately reflect
the concrete being delivered and tested.
3. According to standard concrete sampling practice, a sample should
generally be obtained after what portion of the batch has been discharged?
A. Before discharge begins
B. After approximately 10% and before 90% of the batch has been discharged
C. Only during the final 10%
D. After all concrete has been discharged
Answer: B. After approximately 10% and before 90% of the batch has been
discharged
Rationale: Sampling within this portion of discharge helps produce a
representative sample rather than material that may not reflect the batch as a
whole.
4. What should be done with a concrete sample before testing begins?
A. Add water to restore slump
B. Protect it from contamination and excessive moisture loss
C. Allow it to segregate
D. Add cement paste
Answer: B. Protect it from contamination and excessive moisture loss
Rationale: The sample must be protected and maintained in a condition
representative of the concrete as delivered.
5. What is the standard test used to determine the consistency of freshly
mixed concrete?
A. Air-content test
B. Slump test
,C. Density test
D. Temperature test
Answer: B. Slump test
Rationale: The slump test measures the consistency of freshly mixed concrete
and provides an indication of its relative workability.
6. What equipment is used to perform the conventional concrete slump test?
A. Pressure meter
B. Slump cone
C. Graduated cylinder
D. Compression machine
Answer: B. Slump cone
Rationale: The slump cone, also called the slump mold, is the standardized mold
used for the slump test.
7. How many equal-volume layers are used when filling the slump mold?
A. Two
B. Three
C. Four
D. Five
Answer: C. Four
Rationale: The slump mold is filled in four approximately equal-volume layers,
with each layer rodded as specified.
8. How many times is each layer rodded during the conventional slump test?
A. 10 times
B. 15 times
C. 20 times
D. 25 times
, Answer: D. 25 times
Rationale: Each of the four layers is rodded 25 times using the specified tamping
rod.
9. What is the purpose of rodding each layer during the slump test?
A. To increase cement content
B. To consolidate the concrete uniformly
C. To remove all air from the concrete
D. To increase the slump
Answer: B. To consolidate the concrete uniformly
Rationale: Rodding consolidates each layer in a consistent manner so that the
test can be performed reproducibly.
10.How should the slump mold be positioned during the test?
A. On a soft surface
B. On a level, rigid, nonabsorbent surface
C. On freshly placed concrete
D. On a sloped surface
Answer: B. On a level, rigid, nonabsorbent surface
Rationale: A proper testing surface helps prevent movement of the mold and
provides consistent test conditions.
11.How should the slump mold be removed?
A. Slowly while twisting
B. Straight upward without lateral or twisting motion
C. By pushing it sideways
D. By lifting one side first
Answer: B. Straight upward without lateral or twisting motion
