ACI Concrete Written Exam |Complete with
A+ Graded Answers
Collecting a representative sample of concrete to be tested is as important as executing the test
methods to obtain BLANK
Accurate Results
This practice covers sampling from four types of equipment, which are: BLANK, BLANK,BLANK, and
BLANK
Stationary Mixers, Paving Mixers, Revolving Truck Mixers, Continuous Mixers
The Elapsed time between obtaining the first and final portions of a composite sample shall not
exceed BLANK
15 minutes
Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample.
True or False?
True
Start the tests for slump, temperature, and air content within BLANK after obtaining the final portion
of the composite sample?
5 Minutes
Start molding specimens for strength tests within BLANK after fabricating the composite sample?
15 Minutes
The concrete sample must be protected from contamination and BLANK
Evaporation
The minimum size sample for making strength test specimens is BLANK
1 Cubic ft or 28 litres
When sampling from a stationary mixer, the batch must be sampled at BLANK or more regularly
spaced intervals during discharge of the middle portion of the batch
2
When sampling from a paving mixer, obtain samples from at least BLANK different portions of the pile
and combine them into one composite sample for test purposes
5
When sampling from a revolving truck mixer, sample the concrete by collecting BLANK or more
portions taken at regularly spaced intervals during discharge of the middle portion of this batch.
2
Concrete samples from a truck mixer must be obtained before any water or admixtures are added to
the mixer at the job site. True or False?
, False
When the concrete contains aggregate larger than that permitted for a particular test method, the
sample of concrete must be BLANK before making the test.
Wet Screened
The stem of the thermometer is submerged a minimum of BLANK into the freshly mixed concrete.
3 Inches (75 mm)
The thermometer shall be capable of accurately measuring the temperature
of freshly mixed concrete to BLANK throughout a range of BLANK
1 Deg. Fahrenheit (+/- 0.5 C), 30 to 120 Deg. Fahrenheit (0-50 C)
The thermometer shall be verified within BLANK
At least 1 year of current use
The temperature of concrete may be measured in the wheelbarrow. True of False?
True
The temperature of concrete may be measured in a wall form. True or False?
True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temperature. True or False?
False
What must be done to the sample container prior to sampling the concrete?
Dampened (With water)
What must be done to the concrete surrounding the thermometer after the device is submerged in
the fresh concrete?
Push concrete around the stem to ensure the concrete is in full contact with the stem.
How long must the thermometer remain in the freshly mixed concrete?
2-5 minutes
After the temperature of the concrete is read, what is then required?
Record the temperature
The temperature of the concrete is recorded to the nearest BLANK
1 Deg. Fahrenheit
There is a specified maximum temperature of freshly mixed concrete. True or False?
False
A+ Graded Answers
Collecting a representative sample of concrete to be tested is as important as executing the test
methods to obtain BLANK
Accurate Results
This practice covers sampling from four types of equipment, which are: BLANK, BLANK,BLANK, and
BLANK
Stationary Mixers, Paving Mixers, Revolving Truck Mixers, Continuous Mixers
The Elapsed time between obtaining the first and final portions of a composite sample shall not
exceed BLANK
15 minutes
Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample.
True or False?
True
Start the tests for slump, temperature, and air content within BLANK after obtaining the final portion
of the composite sample?
5 Minutes
Start molding specimens for strength tests within BLANK after fabricating the composite sample?
15 Minutes
The concrete sample must be protected from contamination and BLANK
Evaporation
The minimum size sample for making strength test specimens is BLANK
1 Cubic ft or 28 litres
When sampling from a stationary mixer, the batch must be sampled at BLANK or more regularly
spaced intervals during discharge of the middle portion of the batch
2
When sampling from a paving mixer, obtain samples from at least BLANK different portions of the pile
and combine them into one composite sample for test purposes
5
When sampling from a revolving truck mixer, sample the concrete by collecting BLANK or more
portions taken at regularly spaced intervals during discharge of the middle portion of this batch.
2
Concrete samples from a truck mixer must be obtained before any water or admixtures are added to
the mixer at the job site. True or False?
, False
When the concrete contains aggregate larger than that permitted for a particular test method, the
sample of concrete must be BLANK before making the test.
Wet Screened
The stem of the thermometer is submerged a minimum of BLANK into the freshly mixed concrete.
3 Inches (75 mm)
The thermometer shall be capable of accurately measuring the temperature
of freshly mixed concrete to BLANK throughout a range of BLANK
1 Deg. Fahrenheit (+/- 0.5 C), 30 to 120 Deg. Fahrenheit (0-50 C)
The thermometer shall be verified within BLANK
At least 1 year of current use
The temperature of concrete may be measured in the wheelbarrow. True of False?
True
The temperature of concrete may be measured in a wall form. True or False?
True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temperature. True or False?
False
What must be done to the sample container prior to sampling the concrete?
Dampened (With water)
What must be done to the concrete surrounding the thermometer after the device is submerged in
the fresh concrete?
Push concrete around the stem to ensure the concrete is in full contact with the stem.
How long must the thermometer remain in the freshly mixed concrete?
2-5 minutes
After the temperature of the concrete is read, what is then required?
Record the temperature
The temperature of the concrete is recorded to the nearest BLANK
1 Deg. Fahrenheit
There is a specified maximum temperature of freshly mixed concrete. True or False?
False
