ACI Aggregate Base Testing
Technician Exam Questions and
Answers
(D75) Sampling should be done very carefully because it is as important as _____. -
ANS-Testing
The _____ or _____ should obtain samples related to the control of production at the
source or related to the control of the work at the site. - ANS-Manufacturers, contractors
Samples to be tested for quality should, when possible, be obtained from the _____. -
ANS-Finished product
(D75) Sampling containers for aggregate samples should be made so that the contents
will not be lost, ____ or ___. - ANS-Contaminated or damaged
The reason it is difficult to obtain unbiased samples from stockpiles is because coarse
and fine particles become segregated. True or False? - ANS-True
____ can help in obtaining accurate samples from stockpiles. - ANS-Power equipment
(D75)What are the four sources from which field samples can be obtained? - ANS-
Conveyer belts
Transport units
Roadways
Stockpiles
Wear on the liquid limit device is considered excessive when the point of contact on the
cup or base exceeds approximately ____mm in diameter, or when any point on the rim
of the cup is worn to approximately ____ the original thickness.(D4318) - ANS-13, one
half
(LL) Adjust the height of drop of the cup so that the point on the cup that comes in
contact with the base rises to a height of____. (D4318) - ANS-10 +/-0.2mm
When using the curved grooving tool, the soil sample shall be place in the mixing dish
and thoroughly mixed with ____ to ____mL of water by alternately and repeatedly
stirring, kneading, and chopping with a spatula. (D4318) - ANS-15-20
, T or F
Once testing has begun, additional dry soil may be added to the moistened soil if too
much water is added. (D4318) - ANS-False
The liquid limit device is cranked at a rate of about _______ until the two sides of the
sample come into contact at the bottom of the groove along a distance of about ____.
(D4318) - ANS-two revolutions per second, 13mm or 1/2 inch
T or F
To ensure accurate and consistent shocking, the base of the liquid limit device is to be
held steady with the free hand while cranking. (D4318) - ANS-False
The number of shocks needed to close the groove of each sample is correlated with the
moisture content to determine the _________ of the soil. (D4318) - ANS-Liquid Limit
T or F
All of the material in the cup is used for determining the moisture content for the liquid
limit test. (D4318) - ANS-False. Be sure to sample thru the closed portion of the line
however
The liquid limit procedure is repeated until one determination is made in the ranges of
____, ____, and ____ and the range between each is at least ___. (D4318) - ANS-25-
35, 20-30, 15-25; 10
The liquid limit is the moisture content corresponding to the intersection of the flow
curve with the ___ ordinate.(D4318) - ANS-25 shock
What is defined as the lowest water content determined at which the soil remains
plastic? (D4318) - ANS-Plastic limit of a soil
The _______ of a soil is the range in water content, expressed as a percentage of the
ass of an oven dried soil, within which the material is in a plastic state.(D4318) - ANS-
Plasticity index
The dish used for the plastic limit procedure should have a diameter of about ____mm.
(D4318) - ANS-115
How much of a sieved portion of sample is needed if only the plastic limit of a soil is
required?(D4318) - ANS-20 g
(PL) After placing the air dried soil in a mixing dish, thoroughly mix it with water until the
mass becomes plastic enough to be easily shaped into a ___. This sample should be
approximately ____g. (D4318) - ANS-ellipsoidal mass/ball; 8-10
(PL) The sample is rolled into a thread of _____ diameter throughout its length. (D4318)
- ANS-3mm
Technician Exam Questions and
Answers
(D75) Sampling should be done very carefully because it is as important as _____. -
ANS-Testing
The _____ or _____ should obtain samples related to the control of production at the
source or related to the control of the work at the site. - ANS-Manufacturers, contractors
Samples to be tested for quality should, when possible, be obtained from the _____. -
ANS-Finished product
(D75) Sampling containers for aggregate samples should be made so that the contents
will not be lost, ____ or ___. - ANS-Contaminated or damaged
The reason it is difficult to obtain unbiased samples from stockpiles is because coarse
and fine particles become segregated. True or False? - ANS-True
____ can help in obtaining accurate samples from stockpiles. - ANS-Power equipment
(D75)What are the four sources from which field samples can be obtained? - ANS-
Conveyer belts
Transport units
Roadways
Stockpiles
Wear on the liquid limit device is considered excessive when the point of contact on the
cup or base exceeds approximately ____mm in diameter, or when any point on the rim
of the cup is worn to approximately ____ the original thickness.(D4318) - ANS-13, one
half
(LL) Adjust the height of drop of the cup so that the point on the cup that comes in
contact with the base rises to a height of____. (D4318) - ANS-10 +/-0.2mm
When using the curved grooving tool, the soil sample shall be place in the mixing dish
and thoroughly mixed with ____ to ____mL of water by alternately and repeatedly
stirring, kneading, and chopping with a spatula. (D4318) - ANS-15-20
, T or F
Once testing has begun, additional dry soil may be added to the moistened soil if too
much water is added. (D4318) - ANS-False
The liquid limit device is cranked at a rate of about _______ until the two sides of the
sample come into contact at the bottom of the groove along a distance of about ____.
(D4318) - ANS-two revolutions per second, 13mm or 1/2 inch
T or F
To ensure accurate and consistent shocking, the base of the liquid limit device is to be
held steady with the free hand while cranking. (D4318) - ANS-False
The number of shocks needed to close the groove of each sample is correlated with the
moisture content to determine the _________ of the soil. (D4318) - ANS-Liquid Limit
T or F
All of the material in the cup is used for determining the moisture content for the liquid
limit test. (D4318) - ANS-False. Be sure to sample thru the closed portion of the line
however
The liquid limit procedure is repeated until one determination is made in the ranges of
____, ____, and ____ and the range between each is at least ___. (D4318) - ANS-25-
35, 20-30, 15-25; 10
The liquid limit is the moisture content corresponding to the intersection of the flow
curve with the ___ ordinate.(D4318) - ANS-25 shock
What is defined as the lowest water content determined at which the soil remains
plastic? (D4318) - ANS-Plastic limit of a soil
The _______ of a soil is the range in water content, expressed as a percentage of the
ass of an oven dried soil, within which the material is in a plastic state.(D4318) - ANS-
Plasticity index
The dish used for the plastic limit procedure should have a diameter of about ____mm.
(D4318) - ANS-115
How much of a sieved portion of sample is needed if only the plastic limit of a soil is
required?(D4318) - ANS-20 g
(PL) After placing the air dried soil in a mixing dish, thoroughly mix it with water until the
mass becomes plastic enough to be easily shaped into a ___. This sample should be
approximately ____g. (D4318) - ANS-ellipsoidal mass/ball; 8-10
(PL) The sample is rolled into a thread of _____ diameter throughout its length. (D4318)
- ANS-3mm
