ACI CONCRETE FIELD-TESTING TECHNICIAN- GRADE I EXAM
QUESTIONS AND CORRECT ANSWERS
When consolidating a flexural strength test specimen by rodding, rod one stroke
for each _____ of top surface area. - ANS✅✅2 in.^2 [14 cm^2]
When internal vibration is used to consolidate a standard flexural strength test
specimen, the technician should insert the bibrator at intervals not exceeding
_____ along the center line of the beam. - ANS✅✅6 in. [150 mm]
Concrete mixtures with specified strengths of 6000 psi [40 MPa] or greater shall
have an initial curing temperature between __________. - ANS✅✅68 and 78
degrees F [20 and 26 C]
Up to 48 hours after molding, test specimens that are to be standard cured shall
be stored in a temperature range between _____ to _____. - ANS✅✅60 and 70
degrees F [16 and 27 C]
Upon completion of initial curing, the test specimens may be left in their molds
and sealed in plastic bags. True or False? - ANS✅✅False; specimens are to be
demoled and placed in water storage tanks or moist rooms with free water at a
temperature of 73.5 +- 3.5 degrees F [23.0 +- 2.0 C]
During transportation, test specimens must be protected from damage due to
_____, _____, and _____. - ANS✅✅Jarring, freezing temperatures, moisture
loss
,Specimens shall not be transported until _____ after final set. - ANS✅✅8h
Transportation time shall not exceed _____. - ANS✅✅4h
Standard Curing is the curing method used when test specimens are to be used
for _________. - ANS✅✅Acceptance testing for specified strength, checking
the adequacy of mixture proportions for strength, quality control
Field Curing is the curing method used when test specimens are to be used for
__________. - ANS✅✅Determination of whether the structure is capable of
being put into service; Comparison with standard cured specimens test results or
with results from various in-place test methods; Adequacy of curing and
protection of concrete in the Structure, or Form or shoring removal time
requirements
The sensor of the temperature measuring device shall be submerged a minimum
of _____ in. [_____mm] into the freshly mixed concrete. - ANS✅✅3 in. [75
mm]
The temperature measuring device shall have a capacity of measuring
temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C]
throughout a range of _____. - ANS✅✅1 degree F [0.5 C], 30 degrees F to 120
F [0 C to 50 C]
, The temperature measuring device shall be calibrated _____, or whenever there
is a question of _____. - ANS✅✅Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
ANS✅✅True
The temperature of concrete may be measured in a wall form. True of False -
ANS✅✅True
A composite sample of concrete is required even if the only purpose for obtaining
the sample is to determine temperature. True of False? - ANS✅✅False
What must be done to the sample container prior to sampling the concrete? -
ANS✅✅Dampen (with water)
What must be done to the concrete surrounding the temperature measuring
device after the device is submerged in the fresh concrete. - ANS✅✅Gently
press the concrete around the temperature measuring device at the surface of
the concrete
How long must the temperature measuring device remain in the freshly mixed
concrete? - ANS✅✅At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? -
ANS✅✅Reporting of temperature
QUESTIONS AND CORRECT ANSWERS
When consolidating a flexural strength test specimen by rodding, rod one stroke
for each _____ of top surface area. - ANS✅✅2 in.^2 [14 cm^2]
When internal vibration is used to consolidate a standard flexural strength test
specimen, the technician should insert the bibrator at intervals not exceeding
_____ along the center line of the beam. - ANS✅✅6 in. [150 mm]
Concrete mixtures with specified strengths of 6000 psi [40 MPa] or greater shall
have an initial curing temperature between __________. - ANS✅✅68 and 78
degrees F [20 and 26 C]
Up to 48 hours after molding, test specimens that are to be standard cured shall
be stored in a temperature range between _____ to _____. - ANS✅✅60 and 70
degrees F [16 and 27 C]
Upon completion of initial curing, the test specimens may be left in their molds
and sealed in plastic bags. True or False? - ANS✅✅False; specimens are to be
demoled and placed in water storage tanks or moist rooms with free water at a
temperature of 73.5 +- 3.5 degrees F [23.0 +- 2.0 C]
During transportation, test specimens must be protected from damage due to
_____, _____, and _____. - ANS✅✅Jarring, freezing temperatures, moisture
loss
,Specimens shall not be transported until _____ after final set. - ANS✅✅8h
Transportation time shall not exceed _____. - ANS✅✅4h
Standard Curing is the curing method used when test specimens are to be used
for _________. - ANS✅✅Acceptance testing for specified strength, checking
the adequacy of mixture proportions for strength, quality control
Field Curing is the curing method used when test specimens are to be used for
__________. - ANS✅✅Determination of whether the structure is capable of
being put into service; Comparison with standard cured specimens test results or
with results from various in-place test methods; Adequacy of curing and
protection of concrete in the Structure, or Form or shoring removal time
requirements
The sensor of the temperature measuring device shall be submerged a minimum
of _____ in. [_____mm] into the freshly mixed concrete. - ANS✅✅3 in. [75
mm]
The temperature measuring device shall have a capacity of measuring
temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C]
throughout a range of _____. - ANS✅✅1 degree F [0.5 C], 30 degrees F to 120
F [0 C to 50 C]
, The temperature measuring device shall be calibrated _____, or whenever there
is a question of _____. - ANS✅✅Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
ANS✅✅True
The temperature of concrete may be measured in a wall form. True of False -
ANS✅✅True
A composite sample of concrete is required even if the only purpose for obtaining
the sample is to determine temperature. True of False? - ANS✅✅False
What must be done to the sample container prior to sampling the concrete? -
ANS✅✅Dampen (with water)
What must be done to the concrete surrounding the temperature measuring
device after the device is submerged in the fresh concrete. - ANS✅✅Gently
press the concrete around the temperature measuring device at the surface of
the concrete
How long must the temperature measuring device remain in the freshly mixed
concrete? - ANS✅✅At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? -
ANS✅✅Reporting of temperature
