ACI CONCRETE TEST 4 2026 EXAM SCRIPT
TEST PAPER QUESTIONS AND SOLUTIONS
GRADED A+
◉ 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.
TEST PAPER QUESTIONS AND SOLUTIONS
GRADED A+
◉ 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.
