ACI- Concrete Field-Testing Technician - Grade 1 Questions with
Correct Answers
Q1. Start molding specimens for strength tests within 30 minutes after
fabricating the composite sample.
A. True
B. False - ✔✔B. False
ASTM C172 -Para (4.1.2) - Start molding.
specimens for strength tests within 15 min after fabricating the
composite sample.
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 - ✔✔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 - ✔✔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 - ✔✔A. True
ASTM C172- Para (6.1)
Q5. The composite sample should not be remixed before beginning any
tests.
A. True
B. False - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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.
Correct Answers
Q1. Start molding specimens for strength tests within 30 minutes after
fabricating the composite sample.
A. True
B. False - ✔✔B. False
ASTM C172 -Para (4.1.2) - Start molding.
specimens for strength tests within 15 min after fabricating the
composite sample.
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 - ✔✔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 - ✔✔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 - ✔✔A. True
ASTM C172- Para (6.1)
Q5. The composite sample should not be remixed before beginning any
tests.
A. True
B. False - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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.
