ACI Concrete Field Testing Technician- Grade I Questions & Correct Detailed Answers 2026

ACI Concrete Field Testing Technician- Grade
I Questions & Correct Detailed Answers
2026
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - ANSWER---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
_____. - ANSWER---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 _____. - ANSWER---Annually, accuracy


The temperature of concrete may be measured in a wheelbarrow. True or False? -
ANSWER---True


The temperature of concrete may be measured in a wall form. True of False -
ANSWER---True


A composite sample of concrete is required even if the only purpose for obtaining
the sample is to determine temperature. True of False? - ANSWER---False


What must be done to the sample container prior to sampling the concrete? -
ANSWER---Dampen (with water)


What must be done to the concrete surrounding the temperature measuring device
after the device is submerged in the fresh concrete. - ANSWER---Gently press the
concrete around the temperature measuring device at the surface of the concrete

,ACI Concrete Field Testing Technician- Grade
I Questions & Correct Detailed Answers
2026
How long must the temperature measuring device remain in the freshly mixed
concrete? - ANSWER---At least 2 minutes but not more than 5 minutes


After the temperature of the concrete is read, what is required? - ANSWER---
Reporting of temperature


The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
ANSWER---1 degree F [0.5 C]


According to ASTM C1064, what is one reason to take the temperature of concrete?
- ANSWER---Verify conformance to a specified requirement for temperature of
concrete


A maximum temperature of freshly mixed concrete is specified in ASTM C1064.
True of False? - ANSWER---False


The sample of concrete used for temperature determination must be rodded 25
times. True or False? - ANSWER---False


Sampling by this method is required when tests are to be made to determine _____
with specification requirements. - ANSWER---Compliance


This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. - ANSWER---Stationary mixers, paving mixers, revolving drum
mixers, and open top mixers

, ACI Concrete Field Testing Technician- Grade
I Questions & Correct Detailed Answers
2026
The maximum allowable time between obtaining the first and final portions of a
composite sample is _____ minutes. - ANSWER---15


Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False? - ANSWER---True


The maximum elapsed time allowed between obtaining the final portion of the
composite sample and beginning the tests for slump, temperature, and air content is
_____ minutes. - ANSWER---5


The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample. - ANSWER---15


The concrete sample must be protected from contamination and _____. -
ANSWER---Rapid evaporation


The minimum size sample for making strength test specimens is _____. -
ANSWER---28 L (1ft^3)


When sampling from a stationary mixer, the batch must be sampled at _____ or
more regularly spaced intervals during discharge of the middle portion of the batch -
ANSWER---2


The composite sample for a paving mixer must represent a minimum of _____
different portions of the batch of concrete taken from the pile after discharge. -
ANSWER---5