LADOTD PCC PLANT INSPECTION EXAM
QUESTIONS WITH CORRECT SOLVED ANSWERS.
+ or - 1 % at 1/2 the maximum allowable water per batch - CORRECT
ANSWER✅✅Scales used to weigh water must be accurate to...
+ or - 3% - CORRECT ANSWER✅✅The accuracy of admixture devices must be
sufficient to ensure the correct volume of the mixture in the batch within...
0.1 gram - CORRECT ANSWER✅✅When performing gradation testing on fine
aggregate, the Initial Dry Total Weight of the representative portion is recorded on the
Aggregate Test Report to the nearest...
0.1% of the capacity of the scale - CORRECT ANSWER✅✅The graduation of cement,
fly ash, and aggregate scales must not be greater than...
0.2 - CORRECT ANSWER✅✅You are performing a gradation test on fine aggregate. If
the Initial Dry Total Weight is 543.7 grams and the Accumulated Total is 542.6, what is
the % Difference?
0.2% of the weight tested - CORRECT ANSWER✅✅What must scales for gradation
tests be accurate to?
0.6% or less alkiles - CORRECT ANSWER✅✅Aggregates found to be potentially
reactive with cement alkalies will be restricted for use with cement or a combination of
cement and fly ash containing what?
0.27 cu ft/cu yd of concrete - CORRECT ANSWER✅✅Each percentage of entrained
air in the concrete mixture will increase the absolute water volume by...
1 - 1/2 inch square - CORRECT ANSWER✅✅Each opening for a 1-1/2 inch box
screen sieve is...
2 - CORRECT ANSWER✅✅How many categories of concrete are there?
2 years - CORRECT ANSWER✅✅Provided that the plant is maintained in accordance
with the standards under which certification was issued, plant certification is valid for...
2.8 % - CORRECT ANSWER✅✅If the % moisture is 3.5% and the Absorbtion Factor is
0.7%, what is the % Free Moisture?
, 3 locations, near the top, middle, and bottom of the pile - CORRECT ANSWER✅✅For
a single sack stockpile aggregate sample, where are samples taken from?
3.7 - CORRECT ANSWER✅✅You are performing a gradation test on fine aggregate. If
the Initial Dry Total Weight is 553.2 grams and the Dry Weight After Wash is 549.5,
what value is the Decantation Loss?
9.6 gallons - CORRECT ANSWER✅✅If 10 lbs per cubic yard is to be substituted as
part of the mixing water, how many gallons of ice are to be used for an 8 yd batch?
10.8 gallons - CORRECT ANSWER✅✅How many gallons of water is in 90lbs of water
27.00 cubic feet - CORRECT ANSWER✅✅The sum of the absolute volumes of the
individual materials used to produce one cubic yard of concrete when using the
absolute volume method should be...
28-31 days - CORRECT ANSWER✅✅When are molded concrete cylinders tested for
final acceptance and payment?
30 minutes after the cement is added to the aggregate - CORRECT ANSWER✅✅The
contractor is responsible for ensuring that mixing begins when?
50 seconds - CORRECT ANSWER✅✅How long is the minimal mixing time when
Central or site mixing is done?
53 lbs - CORRECT ANSWER✅✅If pounds of aggregate/cu yd (SSD) is 1174 and the
corrected weight is 1227, what is the amount of free water?
70 revolutions - CORRECT ANSWER✅✅What is the minimal number of revolutions
required when a truck mixer is used?
75% of Max water allowable is taken - CORRECT ANSWER✅✅How do you determine
the minimum amount of mixing water to be added at the plant?
94 pounds - CORRECT ANSWER✅✅How much does a bag of cement weigh?
94 pounds - CORRECT ANSWER✅✅How much does a bag of cement weigh?
230 +- 9°F - CORRECT ANSWER✅✅When drying the representative portion of fine
aggregate for gradation testing, the temperature must be...
901, 1006, and 1016 - CORRECT ANSWER✅✅Concrete produced for precast units
shall conform to what sections of the standard specs?
QUESTIONS WITH CORRECT SOLVED ANSWERS.
+ or - 1 % at 1/2 the maximum allowable water per batch - CORRECT
ANSWER✅✅Scales used to weigh water must be accurate to...
+ or - 3% - CORRECT ANSWER✅✅The accuracy of admixture devices must be
sufficient to ensure the correct volume of the mixture in the batch within...
0.1 gram - CORRECT ANSWER✅✅When performing gradation testing on fine
aggregate, the Initial Dry Total Weight of the representative portion is recorded on the
Aggregate Test Report to the nearest...
0.1% of the capacity of the scale - CORRECT ANSWER✅✅The graduation of cement,
fly ash, and aggregate scales must not be greater than...
0.2 - CORRECT ANSWER✅✅You are performing a gradation test on fine aggregate. If
the Initial Dry Total Weight is 543.7 grams and the Accumulated Total is 542.6, what is
the % Difference?
0.2% of the weight tested - CORRECT ANSWER✅✅What must scales for gradation
tests be accurate to?
0.6% or less alkiles - CORRECT ANSWER✅✅Aggregates found to be potentially
reactive with cement alkalies will be restricted for use with cement or a combination of
cement and fly ash containing what?
0.27 cu ft/cu yd of concrete - CORRECT ANSWER✅✅Each percentage of entrained
air in the concrete mixture will increase the absolute water volume by...
1 - 1/2 inch square - CORRECT ANSWER✅✅Each opening for a 1-1/2 inch box
screen sieve is...
2 - CORRECT ANSWER✅✅How many categories of concrete are there?
2 years - CORRECT ANSWER✅✅Provided that the plant is maintained in accordance
with the standards under which certification was issued, plant certification is valid for...
2.8 % - CORRECT ANSWER✅✅If the % moisture is 3.5% and the Absorbtion Factor is
0.7%, what is the % Free Moisture?
, 3 locations, near the top, middle, and bottom of the pile - CORRECT ANSWER✅✅For
a single sack stockpile aggregate sample, where are samples taken from?
3.7 - CORRECT ANSWER✅✅You are performing a gradation test on fine aggregate. If
the Initial Dry Total Weight is 553.2 grams and the Dry Weight After Wash is 549.5,
what value is the Decantation Loss?
9.6 gallons - CORRECT ANSWER✅✅If 10 lbs per cubic yard is to be substituted as
part of the mixing water, how many gallons of ice are to be used for an 8 yd batch?
10.8 gallons - CORRECT ANSWER✅✅How many gallons of water is in 90lbs of water
27.00 cubic feet - CORRECT ANSWER✅✅The sum of the absolute volumes of the
individual materials used to produce one cubic yard of concrete when using the
absolute volume method should be...
28-31 days - CORRECT ANSWER✅✅When are molded concrete cylinders tested for
final acceptance and payment?
30 minutes after the cement is added to the aggregate - CORRECT ANSWER✅✅The
contractor is responsible for ensuring that mixing begins when?
50 seconds - CORRECT ANSWER✅✅How long is the minimal mixing time when
Central or site mixing is done?
53 lbs - CORRECT ANSWER✅✅If pounds of aggregate/cu yd (SSD) is 1174 and the
corrected weight is 1227, what is the amount of free water?
70 revolutions - CORRECT ANSWER✅✅What is the minimal number of revolutions
required when a truck mixer is used?
75% of Max water allowable is taken - CORRECT ANSWER✅✅How do you determine
the minimum amount of mixing water to be added at the plant?
94 pounds - CORRECT ANSWER✅✅How much does a bag of cement weigh?
94 pounds - CORRECT ANSWER✅✅How much does a bag of cement weigh?
230 +- 9°F - CORRECT ANSWER✅✅When drying the representative portion of fine
aggregate for gradation testing, the temperature must be...
901, 1006, and 1016 - CORRECT ANSWER✅✅Concrete produced for precast units
shall conform to what sections of the standard specs?
