ACI QUESTIONS WITH ANSWERS PROVIDED
The sensor of the temperature measuring device shall be submerged a minimum of ___ inches into the
freshly mixed concrete. ✔✔3
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed
concret to +- ____ degrees F throughout a range of ___. ✔✔1 degree, 30 degrees to 120 degrees F
The temperature measuring device shall be calibrated ___, or whenever there is a question of ___.
✔✔Annually, accuracy.
The temperature of concrete may be measured in a wheelbarrow. T/F? ✔✔True
The temperature of concrete may be measured in a wall form. T/F? ✔✔True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temperature. T/F? ✔✔False
How long must the temperature measuring device remain in the freshly mixed concrete? ✔✔2-5
minutes
After the temperature of the concrete is read, what is required? ✔✔Reporting of the temperature
The temperature of concrete is reported to the nearest ___ degrees F. ✔✔1 degree
According to ASTM C1064, what is one reason to take the temperature of concrete? ✔✔Verify
conformance to a specified requirement for temperature of concrete.
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. T/F? ✔✔False
, The sample of concrete used for temperature determination must be rodded 25 times. T/F? ✔✔False
Sampling by this method is required when tests are to be made to determine ____ with specification
requirements. ✔✔Compliance
This method covers sampling from four types of mixtures which are ___, ___, ___ and ___.
✔✔Stationary mixers, paving mixers, revolving drum mixers and open top mixers
The maximum allowable time between obtaining the first and final portions of a composite sample is
_____ minutes. ✔✔15
Portions of a composite samples shall be thoroughly remixed before beginning tests on the sample. T/F?
✔✔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. ✔✔5
The molding of strength test specimens shall begin within ____ minutes after fabricating the composite
sample. ✔✔15
The concrete sample must be protected from contamination and ____. ✔✔Rapid evaporation, sun,
wind, contamination.
The minimum size sample for making strength test specimens is _____. ✔✔1 ft^3
When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of _____
regularly spaced intervals during discharge of the middle portion of this batch. ✔✔2
Concrete samples from a truck mixer must be obtained from the _____ portion of the batch. ✔✔Middle
The sensor of the temperature measuring device shall be submerged a minimum of ___ inches into the
freshly mixed concrete. ✔✔3
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed
concret to +- ____ degrees F throughout a range of ___. ✔✔1 degree, 30 degrees to 120 degrees F
The temperature measuring device shall be calibrated ___, or whenever there is a question of ___.
✔✔Annually, accuracy.
The temperature of concrete may be measured in a wheelbarrow. T/F? ✔✔True
The temperature of concrete may be measured in a wall form. T/F? ✔✔True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temperature. T/F? ✔✔False
How long must the temperature measuring device remain in the freshly mixed concrete? ✔✔2-5
minutes
After the temperature of the concrete is read, what is required? ✔✔Reporting of the temperature
The temperature of concrete is reported to the nearest ___ degrees F. ✔✔1 degree
According to ASTM C1064, what is one reason to take the temperature of concrete? ✔✔Verify
conformance to a specified requirement for temperature of concrete.
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. T/F? ✔✔False
, The sample of concrete used for temperature determination must be rodded 25 times. T/F? ✔✔False
Sampling by this method is required when tests are to be made to determine ____ with specification
requirements. ✔✔Compliance
This method covers sampling from four types of mixtures which are ___, ___, ___ and ___.
✔✔Stationary mixers, paving mixers, revolving drum mixers and open top mixers
The maximum allowable time between obtaining the first and final portions of a composite sample is
_____ minutes. ✔✔15
Portions of a composite samples shall be thoroughly remixed before beginning tests on the sample. T/F?
✔✔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. ✔✔5
The molding of strength test specimens shall begin within ____ minutes after fabricating the composite
sample. ✔✔15
The concrete sample must be protected from contamination and ____. ✔✔Rapid evaporation, sun,
wind, contamination.
The minimum size sample for making strength test specimens is _____. ✔✔1 ft^3
When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of _____
regularly spaced intervals during discharge of the middle portion of this batch. ✔✔2
Concrete samples from a truck mixer must be obtained from the _____ portion of the batch. ✔✔Middle
