ACI Concrete Field-Testing Technician- Grade I with Verified Answers
1. The sensor of the temperature mea- 3 in. [75 mm]
suring device shall be submerged
a minimum of in. [ mm]
into the freshly mixed concrete.
2. The temperature measuring device 1 degree F [0.5 C], 30 degrees F to
shall have a capacity of measuring 120 F [0 C to 50 C]
temperature of freshly mixed con-
crete to +- degrees F [+-
C] throughout a range of .
3. The temperature measuring device Annually, accuracy
shall be calibrated , or whenev-
er there is a question of .
4. The temperature of concrete may be True
measured in a wheelbarrow. True or
False?
5. The temperature of concrete may True
be measured in a wall form. True of
False
6. A composite sample of concrete is False
required even if the only purpose for
obtaining the sample is to determine
temperature. True of False?
7. What must be done to the sample Dampen (with water)
container prior to sampling the con-
crete?
8. What must be done to the concrete Gently press the concrete around
surrounding the temperature mea- the temperature measuring device
suring device after the device is sub- at the surface of the concrete
merged in the fresh concrete.
9. How long must the temperature mea- At least 2 minutes but not more than
suring device remain in the freshly 5 minutes
mixed concrete?
,ACI Concrete Field-Testing Technician- Grade I with Verified Answers
10. After the temperature of the concrete Reporting of temperature
is read, what is required?
11. The temperature of concrete is re- 1 degree F [0.5 C]
ported to the nearest degrees
F[ C]
12. According to ASTM C1064, what is Verify conformance to a specified
one reason to take the temperature requirement for temperature of con-
of concrete? crete
13. A maximum temperature of freshly False
mixed concrete is specified in ASTM
C1064. True of False?
14. The sample of concrete used for tem- False
perature determination must be rod-
ded 25 times. True or False?
15. Sampling by this method is required Compliance
when tests are to be made to de-
termine with specification re-
quirements.
16. This method covers sampling from Stationary mixers, paving mixers, re-
four types of mixtures which are volving drum mixers, and open top
, , , and . mixers
17. The maximum allowable time be- 15
tween obtaining the first and final
portions of a composite sample is
minutes.
18. Portions of a composite sample shall True
be thoroughly remixed bfore begin-
ning tests on the sample. True of
False?
19. 5
, The maximum elapsed time allowed
between obtaining the final portion
of the composite sample and begin-
ning the tests for slump, tempera-
ture, and air content is min-
utes.
20. The molding of strength test speci- 15
mens shall begin within min-
utes after fabricating the composite
sample.
21. The concrete sample must be Rapid evaporation
protected from contamination and
.
22. The minimum size sample for mak- 28 L (1ft^3)
ing strength test specimens is
.
23. When sampling from a stationary 2
mixer, the batch must be sampled at
or more regularly spaced in-
tervals during discharge of the mid-
dle portion of the batch
24. The composite sample for a paving 5
mixer must represent a minimum of
different portions of the batch
of concrete taken from the pile after
discharge.
25. When sampling from a revolving 2
drum truck mixer, concrete must be
sampled at a minimum of reg-
ularly spaced intervals during dis-
charge of the middle portion of this
batch.
26. False
1. The sensor of the temperature mea- 3 in. [75 mm]
suring device shall be submerged
a minimum of in. [ mm]
into the freshly mixed concrete.
2. The temperature measuring device 1 degree F [0.5 C], 30 degrees F to
shall have a capacity of measuring 120 F [0 C to 50 C]
temperature of freshly mixed con-
crete to +- degrees F [+-
C] throughout a range of .
3. The temperature measuring device Annually, accuracy
shall be calibrated , or whenev-
er there is a question of .
4. The temperature of concrete may be True
measured in a wheelbarrow. True or
False?
5. The temperature of concrete may True
be measured in a wall form. True of
False
6. A composite sample of concrete is False
required even if the only purpose for
obtaining the sample is to determine
temperature. True of False?
7. What must be done to the sample Dampen (with water)
container prior to sampling the con-
crete?
8. What must be done to the concrete Gently press the concrete around
surrounding the temperature mea- the temperature measuring device
suring device after the device is sub- at the surface of the concrete
merged in the fresh concrete.
9. How long must the temperature mea- At least 2 minutes but not more than
suring device remain in the freshly 5 minutes
mixed concrete?
,ACI Concrete Field-Testing Technician- Grade I with Verified Answers
10. After the temperature of the concrete Reporting of temperature
is read, what is required?
11. The temperature of concrete is re- 1 degree F [0.5 C]
ported to the nearest degrees
F[ C]
12. According to ASTM C1064, what is Verify conformance to a specified
one reason to take the temperature requirement for temperature of con-
of concrete? crete
13. A maximum temperature of freshly False
mixed concrete is specified in ASTM
C1064. True of False?
14. The sample of concrete used for tem- False
perature determination must be rod-
ded 25 times. True or False?
15. Sampling by this method is required Compliance
when tests are to be made to de-
termine with specification re-
quirements.
16. This method covers sampling from Stationary mixers, paving mixers, re-
four types of mixtures which are volving drum mixers, and open top
, , , and . mixers
17. The maximum allowable time be- 15
tween obtaining the first and final
portions of a composite sample is
minutes.
18. Portions of a composite sample shall True
be thoroughly remixed bfore begin-
ning tests on the sample. True of
False?
19. 5
, The maximum elapsed time allowed
between obtaining the final portion
of the composite sample and begin-
ning the tests for slump, tempera-
ture, and air content is min-
utes.
20. The molding of strength test speci- 15
mens shall begin within min-
utes after fabricating the composite
sample.
21. The concrete sample must be Rapid evaporation
protected from contamination and
.
22. The minimum size sample for mak- 28 L (1ft^3)
ing strength test specimens is
.
23. When sampling from a stationary 2
mixer, the batch must be sampled at
or more regularly spaced in-
tervals during discharge of the mid-
dle portion of the batch
24. The composite sample for a paving 5
mixer must represent a minimum of
different portions of the batch
of concrete taken from the pile after
discharge.
25. When sampling from a revolving 2
drum truck mixer, concrete must be
sampled at a minimum of reg-
ularly spaced intervals during dis-
charge of the middle portion of this
batch.
26. False
