ACI- Concrete Field-Testing Technician - Grade 1
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1. Q1. Start molding specimens for B. False
strength tests within 30 minutes af-
ter fabricating the composite sam- ASTM C172 -Para (4.1.2) - Start molding.
ple. specimens for strength tests within 15 min after fab-
ricating the
A. True composite sample.
B. False
2. Q2. The maximum allowable time B. False
between obtaining the first and last
portions of the composite sample ASTM C172 - Para (4.1)- The elapsed time shall not
may not exceed 5 minutes. exceed 15 min. between obtaining the first and final
portions of the composite sample.
A. True
B. False
3. Q3. The composite concrete sample A. True
must be protected from sun, wind,
contamination and rapid evapora- ASTM C172 - Para (4.1.2)
tion.
A. True
B. False
4. Q4. If the concrete contains aggre- A. True
gates larger than those that are ap-
propriate for a size of mold or equip- ASTM C172- Para (6.1)
ment used, the sample should be
wet sieved before making the test.
A. True
B. False
, ACI- Concrete Field-Testing Technician - Grade 1
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5. Q5. The composite sample should B. False
not be remixed before beginning
any tests. ASTM C172-Para (4.1.1) -The sample shall be com-
bined and remixed with a shovel the minimum
A. True amount necessary to ensure uniformity and compli-
B. False ance with the maximum time limits
6. Q6. Sampling should normally be B. False
performed, as the concrete is dis-
charged from the mixer. ASTM C172-Para (5). NOTE 2—Sampling should
normally be performed as the concrete is delivered
A. True from the mixer.
B. False
To the conveying vehicle used to transport the
concrete to the forms; however, specifications may
require other points of sampling, such as the dis-
charge of a concrete pump.
7. Q7. ASTM Method C172 includes A. True
sampling from stationary mixers,
paving mixers, truck mixers, agita- ASTM C172- Para (1.1)
tors, and non-agitating equipment.
A. True
B. False
8. Q8. After sampling is completed, D. None of the above
start the tests for slump and air con-
tent within: ASTM C172- Para (4.1.2) Start tests for slump, tem-
perature, and air content within 5 min after obtaining
A. 2 ½ minutes the final portion of the composite sample.
B. 10 minutes
, ACI- Concrete Field-Testing Technician - Grade 1
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C. 15 minutes
D. None of the above
9. Q9. In any case, do not obtain sam- A. All the water and admixtures have been added to
ples until: the concrete.
A. All the water and admixtures have ASTM C172- Para (5.2.3). In any case do not obtain
been added to the concrete samples until after all of the water has been added
B. 200 revolutions of the drum have to the mixer.
been obtained
C. ½ of the water has been added
D. None of the above
10. Q10. No samples shall be taken be- A. 10% or after 90%
fore_________ or after_________ of the
batch has been discharged. ASTM C172- Para (5.2.1).
A. 10% or after 90% NOTE 3—No samples should be taken before 10 %
B. 20% or after 90% or after 90 % of the batch has been discharged.
C. 20% or after 80%
Due to the difficulty of determining the actual quan-
D. None of the above
tity of concrete discharged, the intent is to provide
samples that are representative of widely separated
portions, but not the beginning and the end of the
load.
11. Q11. When strength tests are to be B. 1 cubic foot
made, the minimum size of the com-
posite sample shall be: ASTM C172- Para (5.1).
A. ¼ cubic foot Make the samples to be used for strength tests a
B. 1 cubic foot minimum of 28 L (1 ft3).
, ACI- Concrete Field-Testing Technician - Grade 1
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C. Any convenient size
D. 1 Wheelbarrow
12. Q12. Sample the concrete from the B.
chute of a truck mixer by:
Passing a receptacle completely through the dis-
A. Raising chute to stop the flow and charge steam or by completely diverting the dis-
scoop concrete from there into the charge into the sample container.
slump cone and cylinder molds
B. Passing a receptacle completely ASTM C172- Para (5.2.3).
through the discharge steam or by
completely diverting the discharge
into the sample container
C. Holding a shovel in the flow and
direct half into a bucket
D. None of the above
13. Q13. Fresh concrete to be tested C. Two or more regularly spaced intervals during
at the job site should be sampled discharge of the middle portion of the batch
from:
ASTM C172- Para (5.2.1).
A. The beginning of mixer discharge
B. The last concrete discharged
C. Two or more regularly spaced in-
tervals during discharge of the mid-
dle portion of the batch
D. All of the above
14. Q14. The elapsed time between ob- D. None of the above
taining the first and final portions of
the composite sample, according to ASTM C172- Para (4.1)
ASTM C172, shall not exceed:
The elapsed time shall not exceed 15 min. between
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1. Q1. Start molding specimens for B. False
strength tests within 30 minutes af-
ter fabricating the composite sam- ASTM C172 -Para (4.1.2) - Start molding.
ple. specimens for strength tests within 15 min after fab-
ricating the
A. True composite sample.
B. False
2. Q2. The maximum allowable time B. False
between obtaining the first and last
portions of the composite sample ASTM C172 - Para (4.1)- The elapsed time shall not
may not exceed 5 minutes. exceed 15 min. between obtaining the first and final
portions of the composite sample.
A. True
B. False
3. Q3. The composite concrete sample A. True
must be protected from sun, wind,
contamination and rapid evapora- ASTM C172 - Para (4.1.2)
tion.
A. True
B. False
4. Q4. If the concrete contains aggre- A. True
gates larger than those that are ap-
propriate for a size of mold or equip- ASTM C172- Para (6.1)
ment used, the sample should be
wet sieved before making the test.
A. True
B. False
, ACI- Concrete Field-Testing Technician - Grade 1
Study online at https://quizlet.com/_cv5abn
5. Q5. The composite sample should B. False
not be remixed before beginning
any tests. ASTM C172-Para (4.1.1) -The sample shall be com-
bined and remixed with a shovel the minimum
A. True amount necessary to ensure uniformity and compli-
B. False ance with the maximum time limits
6. Q6. Sampling should normally be B. False
performed, as the concrete is dis-
charged from the mixer. ASTM C172-Para (5). NOTE 2—Sampling should
normally be performed as the concrete is delivered
A. True from the mixer.
B. False
To the conveying vehicle used to transport the
concrete to the forms; however, specifications may
require other points of sampling, such as the dis-
charge of a concrete pump.
7. Q7. ASTM Method C172 includes A. True
sampling from stationary mixers,
paving mixers, truck mixers, agita- ASTM C172- Para (1.1)
tors, and non-agitating equipment.
A. True
B. False
8. Q8. After sampling is completed, D. None of the above
start the tests for slump and air con-
tent within: ASTM C172- Para (4.1.2) Start tests for slump, tem-
perature, and air content within 5 min after obtaining
A. 2 ½ minutes the final portion of the composite sample.
B. 10 minutes
, ACI- Concrete Field-Testing Technician - Grade 1
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C. 15 minutes
D. None of the above
9. Q9. In any case, do not obtain sam- A. All the water and admixtures have been added to
ples until: the concrete.
A. All the water and admixtures have ASTM C172- Para (5.2.3). In any case do not obtain
been added to the concrete samples until after all of the water has been added
B. 200 revolutions of the drum have to the mixer.
been obtained
C. ½ of the water has been added
D. None of the above
10. Q10. No samples shall be taken be- A. 10% or after 90%
fore_________ or after_________ of the
batch has been discharged. ASTM C172- Para (5.2.1).
A. 10% or after 90% NOTE 3—No samples should be taken before 10 %
B. 20% or after 90% or after 90 % of the batch has been discharged.
C. 20% or after 80%
Due to the difficulty of determining the actual quan-
D. None of the above
tity of concrete discharged, the intent is to provide
samples that are representative of widely separated
portions, but not the beginning and the end of the
load.
11. Q11. When strength tests are to be B. 1 cubic foot
made, the minimum size of the com-
posite sample shall be: ASTM C172- Para (5.1).
A. ¼ cubic foot Make the samples to be used for strength tests a
B. 1 cubic foot minimum of 28 L (1 ft3).
, ACI- Concrete Field-Testing Technician - Grade 1
Study online at https://quizlet.com/_cv5abn
C. Any convenient size
D. 1 Wheelbarrow
12. Q12. Sample the concrete from the B.
chute of a truck mixer by:
Passing a receptacle completely through the dis-
A. Raising chute to stop the flow and charge steam or by completely diverting the dis-
scoop concrete from there into the charge into the sample container.
slump cone and cylinder molds
B. Passing a receptacle completely ASTM C172- Para (5.2.3).
through the discharge steam or by
completely diverting the discharge
into the sample container
C. Holding a shovel in the flow and
direct half into a bucket
D. None of the above
13. Q13. Fresh concrete to be tested C. Two or more regularly spaced intervals during
at the job site should be sampled discharge of the middle portion of the batch
from:
ASTM C172- Para (5.2.1).
A. The beginning of mixer discharge
B. The last concrete discharged
C. Two or more regularly spaced in-
tervals during discharge of the mid-
dle portion of the batch
D. All of the above
14. Q14. The elapsed time between ob- D. None of the above
taining the first and final portions of
the composite sample, according to ASTM C172- Para (4.1)
ASTM C172, shall not exceed:
The elapsed time shall not exceed 15 min. between
