ACI CONCRETE FIELD TESTING TECHNICIAN
GRADE 1 EXAM STUDY GUIDE 2026 COMPLETE
QUESTIONS AND ANSWERS
● Q2. The maximum allowable time between obtaining the first and last
portions of the composite sample may not exceed 5 minutes.
A. True
B. False. Answer: B. False
ASTM C172 - Para (4.1)- The elapsed time shall not exceed 15 min.
between obtaining the first and final portions of the composite sample.
● Q3. The composite concrete sample must be protected from sun, wind,
contamination and rapid evaporation.
A. True
B. False. Answer: A. True
ASTM C172 - Para (4.1.2)
,● Q4. If the concrete contains aggregates larger than those that are
appropriate for a size of mold or equipment used, the sample should be
wet sieved before making the test.
A. True
B. False. Answer: A. True
ASTM C172- Para (6.1)
● Q5. The composite sample should not be remixed before beginning
any tests.
A. True
B. False. Answer: B. False
ASTM C172-Para (4.1.1) -The sample shall be combined and remixed
with a shovel the minimum amount necessary to ensure uniformity and
compliance with the maximum time limits
● Q6. Sampling should normally be performed, as the concrete is
discharged from the mixer.
A. True
B. False. Answer: B. False
,ASTM C172-Para (5). NOTE 2—Sampling should normally be
performed as the concrete is delivered from the mixer.
To the conveying vehicle used to transport the
concrete to the forms; however, specifications may require other points
of sampling, such as the discharge of a concrete pump.
● Q7. ASTM Method C172 includes sampling from stationary mixers,
paving mixers, truck mixers, agitators, and non-agitating equipment.
A. True
B. False. Answer: A. True
ASTM C172- Para (1.1)
● Q8. After sampling is completed, start the tests for slump and air
content within:
A. 2 ½ minutes
B. 10 minutes
C. 15 minutes
D. None of the above. Answer: D. None of the above
, ASTM C172- Para (4.1.2) Start tests for slump, temperature, and air
content within 5 min after obtaining the final portion of the composite
sample.
● Q9. In any case, do not obtain samples until:
A. All the water and admixtures have been added to the concrete
B. 200 revolutions of the drum have been obtained
C. ½ of the water has been added
D. None of the above. Answer: A. All the water and admixtures have
been added to the concrete.
ASTM C172- Para (5.2.3). In any case do not obtain samples until after
all of the water has been added to the mixer.
● Q10. No samples shall be taken before_________ or after_________
of the batch has been discharged.
A. 10% or after 90%
B. 20% or after 90%
C. 20% or after 80%
D. None of the above. Answer: A. 10% or after 90%
GRADE 1 EXAM STUDY GUIDE 2026 COMPLETE
QUESTIONS AND ANSWERS
● Q2. The maximum allowable time between obtaining the first and last
portions of the composite sample may not exceed 5 minutes.
A. True
B. False. Answer: B. False
ASTM C172 - Para (4.1)- The elapsed time shall not exceed 15 min.
between obtaining the first and final portions of the composite sample.
● Q3. The composite concrete sample must be protected from sun, wind,
contamination and rapid evaporation.
A. True
B. False. Answer: A. True
ASTM C172 - Para (4.1.2)
,● Q4. If the concrete contains aggregates larger than those that are
appropriate for a size of mold or equipment used, the sample should be
wet sieved before making the test.
A. True
B. False. Answer: A. True
ASTM C172- Para (6.1)
● Q5. The composite sample should not be remixed before beginning
any tests.
A. True
B. False. Answer: B. False
ASTM C172-Para (4.1.1) -The sample shall be combined and remixed
with a shovel the minimum amount necessary to ensure uniformity and
compliance with the maximum time limits
● Q6. Sampling should normally be performed, as the concrete is
discharged from the mixer.
A. True
B. False. Answer: B. False
,ASTM C172-Para (5). NOTE 2—Sampling should normally be
performed as the concrete is delivered from the mixer.
To the conveying vehicle used to transport the
concrete to the forms; however, specifications may require other points
of sampling, such as the discharge of a concrete pump.
● Q7. ASTM Method C172 includes sampling from stationary mixers,
paving mixers, truck mixers, agitators, and non-agitating equipment.
A. True
B. False. Answer: A. True
ASTM C172- Para (1.1)
● Q8. After sampling is completed, start the tests for slump and air
content within:
A. 2 ½ minutes
B. 10 minutes
C. 15 minutes
D. None of the above. Answer: D. None of the above
, ASTM C172- Para (4.1.2) Start tests for slump, temperature, and air
content within 5 min after obtaining the final portion of the composite
sample.
● Q9. In any case, do not obtain samples until:
A. All the water and admixtures have been added to the concrete
B. 200 revolutions of the drum have been obtained
C. ½ of the water has been added
D. None of the above. Answer: A. All the water and admixtures have
been added to the concrete.
ASTM C172- Para (5.2.3). In any case do not obtain samples until after
all of the water has been added to the mixer.
● Q10. No samples shall be taken before_________ or after_________
of the batch has been discharged.
A. 10% or after 90%
B. 20% or after 90%
C. 20% or after 80%
D. None of the above. Answer: A. 10% or after 90%
