CONCRETE FIELD TECHNICIAN
NCDOT STUDY GUIDE. EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
While performing the Volumetric Method air test, two pints of alcohol were used to dispel the
foam. Which of the following statements is true? - ANS No correction is required
When pouring Drill Pier Concrete, what is the minimum sampling frequency for test specimens?
- ANS Each load
When used to determine unit weight, the concrete in the mold must be struck off with a ... -
ANS 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 ... - ANS 5.9%
Which percent range most nearly represents the amount of paste volume in a concrete mix? -
ANS 20-40%
The air content for incidental and structural concrete ranges from ________ to ________
percent - ANS 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. - ANS 150
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 6
, When water is added to concrete in the mixer at the job site, the minimum number of
revolutions placed on the mixer is... - ANS 25
After consolidation of the unit weight sample, a small amount of concrete can be added to
correct for any deficiencies. - ANS true
Calculate the air content using the following weights: Theoretical Unit Weight 150.05 pcf Actual
Unit Weight 140.75 pcf - ANS 6.2%
The minimum size sample for one set of concrete test specimens is: - ANS 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: - ANS 1 set
By NCDOT specifications, fly ash may be substituted for Portland Cement up to ___________%
by weight of the required cement. - ANS 20
The slump test has to be completed within ____________ minutes from the time concrete is
introduced into the cone. - ANS 2.5
_________________ is used to dissolve the entrained air bubbled when performing the Chace
Air Indicator test. - ANS 70% isopropyl alcohol
A curing day is defined as any consecutive _____________ period, during which the air
temperature adjacent to the mass does not fall below ________________ degrees Fahrenheit. -
ANS 24 hours, 40
True or Fales : The purpose of air entrainment is to retard the concrete, thereby increasing
allowable placement time. - ANS false
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 6
NCDOT STUDY GUIDE. EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
While performing the Volumetric Method air test, two pints of alcohol were used to dispel the
foam. Which of the following statements is true? - ANS No correction is required
When pouring Drill Pier Concrete, what is the minimum sampling frequency for test specimens?
- ANS Each load
When used to determine unit weight, the concrete in the mold must be struck off with a ... -
ANS 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 ... - ANS 5.9%
Which percent range most nearly represents the amount of paste volume in a concrete mix? -
ANS 20-40%
The air content for incidental and structural concrete ranges from ________ to ________
percent - ANS 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. - ANS 150
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 6
, When water is added to concrete in the mixer at the job site, the minimum number of
revolutions placed on the mixer is... - ANS 25
After consolidation of the unit weight sample, a small amount of concrete can be added to
correct for any deficiencies. - ANS true
Calculate the air content using the following weights: Theoretical Unit Weight 150.05 pcf Actual
Unit Weight 140.75 pcf - ANS 6.2%
The minimum size sample for one set of concrete test specimens is: - ANS 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: - ANS 1 set
By NCDOT specifications, fly ash may be substituted for Portland Cement up to ___________%
by weight of the required cement. - ANS 20
The slump test has to be completed within ____________ minutes from the time concrete is
introduced into the cone. - ANS 2.5
_________________ is used to dissolve the entrained air bubbled when performing the Chace
Air Indicator test. - ANS 70% isopropyl alcohol
A curing day is defined as any consecutive _____________ period, during which the air
temperature adjacent to the mass does not fall below ________________ degrees Fahrenheit. -
ANS 24 hours, 40
True or Fales : The purpose of air entrainment is to retard the concrete, thereby increasing
allowable placement time. - ANS false
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 6
