ACI- Concrete Field-Testing Technician - Grade 1
| QUESTIONS & VERIFIED ANSWERS
Save
Terms in this set (133)
Q1. Start molding specimens for B. False
strength tests within 30 minutes after
fabricating the composite sample. ASTM C172 -Para (4.1.2) - Start molding.
specimens for strength tests within 15 min after
A. True fabricating the
B. False composite sample.
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
Q3. The composite concrete sample A. True
must be protected from sun, wind,
contamination and rapid evaporation. ASTM C172 - Para (4.1.2)
A. True
B. False
,Q4. If the concrete contains A. True
aggregates larger than those that are
appropriate for a size of mold or ASTM C172- Para (6.1)
equipment used, the sample should
be wet sieved before making the test.
A. True
B. False
Q5. The composite sample should B. False
not be remixed before beginning any
tests. ASTM C172-Para (4.1.1) -The sample shall be
combined and remixed with a shovel the minimum
A. True amount necessary to ensure uniformity and
B. False compliance with the maximum time limits
Q6. Sampling should normally be B. False
performed, as the concrete is
discharged 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
discharge of a concrete pump.
Q7. ASTM Method C172 includes A. True
sampling from stationary mixers,
paving mixers, truck mixers, agitators, ASTM C172- Para (1.1)
and non-agitating equipment.
A. True
B. False
, Q8. After sampling is completed, D. None of the above
start the tests for slump and air
content within: ASTM C172- Para (4.1.2) Start tests for slump,
temperature, and air content within 5 min after
A. 2 ½ minutes obtaining the final portion of the composite sample.
B. 10 minutes
C. 15 minutes
D. None of the above
Q9. In any case, do not obtain A. All the water and admixtures have been added
samples until: to 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
Q10. No samples shall be taken A. 10% or after 90%
before_________ 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%
D. None of the above Due to the difficulty of determining the actual
quantity 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.
| QUESTIONS & VERIFIED ANSWERS
Save
Terms in this set (133)
Q1. Start molding specimens for B. False
strength tests within 30 minutes after
fabricating the composite sample. ASTM C172 -Para (4.1.2) - Start molding.
specimens for strength tests within 15 min after
A. True fabricating the
B. False composite sample.
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
Q3. The composite concrete sample A. True
must be protected from sun, wind,
contamination and rapid evaporation. ASTM C172 - Para (4.1.2)
A. True
B. False
,Q4. If the concrete contains A. True
aggregates larger than those that are
appropriate for a size of mold or ASTM C172- Para (6.1)
equipment used, the sample should
be wet sieved before making the test.
A. True
B. False
Q5. The composite sample should B. False
not be remixed before beginning any
tests. ASTM C172-Para (4.1.1) -The sample shall be
combined and remixed with a shovel the minimum
A. True amount necessary to ensure uniformity and
B. False compliance with the maximum time limits
Q6. Sampling should normally be B. False
performed, as the concrete is
discharged 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
discharge of a concrete pump.
Q7. ASTM Method C172 includes A. True
sampling from stationary mixers,
paving mixers, truck mixers, agitators, ASTM C172- Para (1.1)
and non-agitating equipment.
A. True
B. False
, Q8. After sampling is completed, D. None of the above
start the tests for slump and air
content within: ASTM C172- Para (4.1.2) Start tests for slump,
temperature, and air content within 5 min after
A. 2 ½ minutes obtaining the final portion of the composite sample.
B. 10 minutes
C. 15 minutes
D. None of the above
Q9. In any case, do not obtain A. All the water and admixtures have been added
samples until: to 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
Q10. No samples shall be taken A. 10% or after 90%
before_________ 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%
D. None of the above Due to the difficulty of determining the actual
quantity 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.
