Concrete Field Technician
NCDOT Study Guide
Comprehensive Questions
(Frequently Tested) with
Verified Answers Graded A+
While performing the Volumetric Method air test, two pints of alcohol were used to dispel the
foam. Which of the following statements is true? - Answer: No correction is required
When pouring Drill Pier Concrete, what is the minimum sampling frequency for test specimens?
- Answer: Each load
When used to determine unit weight, the concrete in the mold must be struck off with a ... -
Answer: Strike off plate
The reading on the gauge of a pressure meter is 6.2%. The aggregate used has a correction
factor of 0.3%. The final air reported is ... - Answer: 5.9%
Which percent range most nearly represents the amount of paste volume in a concrete mix? -
Answer: 20-40%
, The air content for incidental and structural concrete ranges from ________ to ________
percent - Answer: 4.5-7.5
Components of concrete that are heated due to cold conditions are heated to a maximum
temperature of _________ degrees Fahrenheit by NCDOT specifications. - Answer: 150
When water is added to concrete in the mixer at the job site, the minimum number of
revolutions placed on the mixer is... - Answer: 25
After consolidation of the unit weight sample, a small amount of concrete can be added to
correct for any deficiencies. - Answer: true
Calculate the air content using the following weights: Theoretical Unit Weight 150.05 pcf Actual
Unit Weight 140.75 pcf - Answer: 6.2%
The minimum size sample for one set of concrete test specimens is: - Answer: 1.0 cubic foot
The minimum set(s) of cylinders to be made on an NCDOT project for class AA concrete on an
87 yd 3 pour is: - Answer: 1 set
By NCDOT specifications, fly ash may be substituted for Portland Cement up to ___________%
by weight of the required cement. - Answer: 20
The slump test has to be completed within ____________ minutes from the time concrete is
introduced into the cone. - Answer: 2.5
_________________ is used to dissolve the entrained air bubbled when performing the Chace
Air Indicator test. - Answer: 70% isopropyl alcohol
NCDOT Study Guide
Comprehensive Questions
(Frequently Tested) with
Verified Answers Graded A+
While performing the Volumetric Method air test, two pints of alcohol were used to dispel the
foam. Which of the following statements is true? - Answer: No correction is required
When pouring Drill Pier Concrete, what is the minimum sampling frequency for test specimens?
- Answer: Each load
When used to determine unit weight, the concrete in the mold must be struck off with a ... -
Answer: Strike off plate
The reading on the gauge of a pressure meter is 6.2%. The aggregate used has a correction
factor of 0.3%. The final air reported is ... - Answer: 5.9%
Which percent range most nearly represents the amount of paste volume in a concrete mix? -
Answer: 20-40%
, The air content for incidental and structural concrete ranges from ________ to ________
percent - Answer: 4.5-7.5
Components of concrete that are heated due to cold conditions are heated to a maximum
temperature of _________ degrees Fahrenheit by NCDOT specifications. - Answer: 150
When water is added to concrete in the mixer at the job site, the minimum number of
revolutions placed on the mixer is... - Answer: 25
After consolidation of the unit weight sample, a small amount of concrete can be added to
correct for any deficiencies. - Answer: true
Calculate the air content using the following weights: Theoretical Unit Weight 150.05 pcf Actual
Unit Weight 140.75 pcf - Answer: 6.2%
The minimum size sample for one set of concrete test specimens is: - Answer: 1.0 cubic foot
The minimum set(s) of cylinders to be made on an NCDOT project for class AA concrete on an
87 yd 3 pour is: - Answer: 1 set
By NCDOT specifications, fly ash may be substituted for Portland Cement up to ___________%
by weight of the required cement. - Answer: 20
The slump test has to be completed within ____________ minutes from the time concrete is
introduced into the cone. - Answer: 2.5
_________________ is used to dissolve the entrained air bubbled when performing the Chace
Air Indicator test. - Answer: 70% isopropyl alcohol
