ACI - Aggregate Base Testing Technician Test Questions &
Answers (A+ Graded 100% Verified)
Testing
Sampling should be done very carefully because it is as important as ____________.
Conveyer belts
Transport units
Roadways
Stockpiles
What are the four sources from which field samples can be obtained?
contaminated, damaged
Sampling containers for aggregate samples should be made so that the contents will
not be lost, _____ or _____.
Nonrepresentative sample
Not using correct procedures for reducing samples to testing size can result in a _____.
False
T or F
Generally, small samples are most representative of the total supply.
True
T or F
There are some instances in which differences between test samples can't be avoided.
Laws of chance
What determines whether large-size particles are equally distributed among test
samples that have been reduced?
Method A, mechanical splitter
Which method of reducing a sample must be used with fine, dry aggregate?
Moisten the sample
What must be done to the sample if method B or C is used?
Dry the sample
What do you do if the sample is wet and Method A is to be used?
Coarse aggregate, or mixtures of coarse and fine aggregate
Method C, miniature stockpiling, cannot be used for which type of aggregate?
Method A
Which method involves the use of chutes, holding receptacles, and hoppers or straight-
edged pans?
8
Sample splitters must have how many equal width chutes for coarse aggregate?
12
Sample splitters must have how many equal width chutes for fine aggregate?
conical pile
In Methods B and C the sample is shoveled into a ____ before it is flattened and
divided.
Canvas blanket or tear resistant tarp
When using Method B, what is an alternate surface that can be used when reducing the
sample?
, diagonally opposite
When quartering a sample, retain two _________ quarters and reject the other two.
5, random
In miniature stockpile sampling, obtain the sample by selecting at least ____ increments
of material from ____ locations in the stockpile.
60C/140F
The drying apparatus used for dry preparation of a sample is any suitable device
capable of drying samples at a temperature not exceeding _____.
representative, fines
A suitable sample splitter is one capable of obtaining ____ portions of the sample
without appreciable loss of ____.
110, 60
For particle size analysis, material passing a 2.00mm (No. 10) sieve is required in
amounts equal to approximately ___ g for sandy soils and approximately ___g for silty
or clayey soils.
25, 10
For specific gravity, material passing a 2.00mm (10) sieve is requires in amounts of at
least ____g when the volumetric flask is used and at least ____g when the stoppered
bottle is used.
2.00mm (No. 10), Two
For the physical test, the remaining portion of the material passing the _____ sieve shall
be separated into ____ parts by means of a 0.425mm (40) sieve.
Pulverizing operation
For the physical test, if the sample contains brittle particles such as flakes of mica,
fragments of seashells, etc, the ____________ shall be done carefully to free the finer
material that adheres to the coarse particles.
The liquid limit of a soil
What is defined as he water content at which the soil passes from a plastic to a liquid?
corrosion, mass, disintegration
(LL) suitable containers should be made of material resistant to ____ and not subject to
change in ____ or ___ on repeated heating and cooling.
100g
(LL) A sample with a mass of about ___ shall be taken from the thoroughly mixed
portion of the material.
13, one half
Wear on the liquid limit device is considered excessive whe 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 approximately ____ the original thickness.
10.0 +-0.2mm
(LL) Adjust the height of drop of the cup so tha the point on the cup that comes in
contact with the base rises to a height of____.
15-20
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.
False
Answers (A+ Graded 100% Verified)
Testing
Sampling should be done very carefully because it is as important as ____________.
Conveyer belts
Transport units
Roadways
Stockpiles
What are the four sources from which field samples can be obtained?
contaminated, damaged
Sampling containers for aggregate samples should be made so that the contents will
not be lost, _____ or _____.
Nonrepresentative sample
Not using correct procedures for reducing samples to testing size can result in a _____.
False
T or F
Generally, small samples are most representative of the total supply.
True
T or F
There are some instances in which differences between test samples can't be avoided.
Laws of chance
What determines whether large-size particles are equally distributed among test
samples that have been reduced?
Method A, mechanical splitter
Which method of reducing a sample must be used with fine, dry aggregate?
Moisten the sample
What must be done to the sample if method B or C is used?
Dry the sample
What do you do if the sample is wet and Method A is to be used?
Coarse aggregate, or mixtures of coarse and fine aggregate
Method C, miniature stockpiling, cannot be used for which type of aggregate?
Method A
Which method involves the use of chutes, holding receptacles, and hoppers or straight-
edged pans?
8
Sample splitters must have how many equal width chutes for coarse aggregate?
12
Sample splitters must have how many equal width chutes for fine aggregate?
conical pile
In Methods B and C the sample is shoveled into a ____ before it is flattened and
divided.
Canvas blanket or tear resistant tarp
When using Method B, what is an alternate surface that can be used when reducing the
sample?
, diagonally opposite
When quartering a sample, retain two _________ quarters and reject the other two.
5, random
In miniature stockpile sampling, obtain the sample by selecting at least ____ increments
of material from ____ locations in the stockpile.
60C/140F
The drying apparatus used for dry preparation of a sample is any suitable device
capable of drying samples at a temperature not exceeding _____.
representative, fines
A suitable sample splitter is one capable of obtaining ____ portions of the sample
without appreciable loss of ____.
110, 60
For particle size analysis, material passing a 2.00mm (No. 10) sieve is required in
amounts equal to approximately ___ g for sandy soils and approximately ___g for silty
or clayey soils.
25, 10
For specific gravity, material passing a 2.00mm (10) sieve is requires in amounts of at
least ____g when the volumetric flask is used and at least ____g when the stoppered
bottle is used.
2.00mm (No. 10), Two
For the physical test, the remaining portion of the material passing the _____ sieve shall
be separated into ____ parts by means of a 0.425mm (40) sieve.
Pulverizing operation
For the physical test, if the sample contains brittle particles such as flakes of mica,
fragments of seashells, etc, the ____________ shall be done carefully to free the finer
material that adheres to the coarse particles.
The liquid limit of a soil
What is defined as he water content at which the soil passes from a plastic to a liquid?
corrosion, mass, disintegration
(LL) suitable containers should be made of material resistant to ____ and not subject to
change in ____ or ___ on repeated heating and cooling.
100g
(LL) A sample with a mass of about ___ shall be taken from the thoroughly mixed
portion of the material.
13, one half
Wear on the liquid limit device is considered excessive whe 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 approximately ____ the original thickness.
10.0 +-0.2mm
(LL) Adjust the height of drop of the cup so tha the point on the cup that comes in
contact with the base rises to a height of____.
15-20
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.
False
