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ACI AGGREGATE TESTING TECHNICIAN
EXAM QUESTIONS AND ANSWERS 2025
Performance Checklist:
Sampling of Aggregates:
Flowing Aggregate Stream (Bins or Belt Discharge)
5 steps - correct answer- 1. Use a device that will hold the
required amount of material without overflowing.
2. Take each increment from the entire cross section of the
material discharge stream
3. Obtain a minimum of three approximately equal increments.
4. Combine the increments to form a field sample.
5. Ensure that the size of the field sample equals or exceeds
the approximate minimum mass needed or stated in Table 1.
Performance Checklist:
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Sampling of Aggregates:
Conveyor Belt
7 Steps - correct answer- 1. Stop the conveyor belt and insert
two templates conforming to the shape of the belt into the
aggregate steam.
2. Space the templates so the material between will yield an
increment of the required mass.
3. Carefully scoop the material between the templates into a
suitable container.
4. Collect the fines with a brush and dust pan and add to the
container.
5. Obtain a minimum of three approximately equal increments.
6. Combine the increments to form a field sample.
7. Ensure that the size of the field sample equals or exceeds
the approximate minimum mass needed or stated in Table 1.
Performance Checklist:
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Sampling of Aggregates:
Stockpiles (Manual Sampling)
7 Steps - correct answer- Course Aggregate
1. Shove a board vertically into the pile just above the sampling
point.
2. Take increments from the top third, mid-point, and bottom
third of the volume of the pile.
Fine Aggregate
3. Remove the outer layer and sample from the material
beneath.
4. Insert the appropriate sampling tube randomly to extract the
increments.
5. Obtain a minimum of five increments.
Coarse and Fine Aggregate
6. Combine the increments to form a field sample.
7. Ensure that the size of the field sample equals or exceeds
the approximate minimum mass needed or stated in Table 1.
ACI AGGREGATE TESTING TECHNICIAN
EXAM QUESTIONS AND ANSWERS 2025
Performance Checklist:
Sampling of Aggregates:
Flowing Aggregate Stream (Bins or Belt Discharge)
5 steps - correct answer- 1. Use a device that will hold the
required amount of material without overflowing.
2. Take each increment from the entire cross section of the
material discharge stream
3. Obtain a minimum of three approximately equal increments.
4. Combine the increments to form a field sample.
5. Ensure that the size of the field sample equals or exceeds
the approximate minimum mass needed or stated in Table 1.
Performance Checklist:
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Sampling of Aggregates:
Conveyor Belt
7 Steps - correct answer- 1. Stop the conveyor belt and insert
two templates conforming to the shape of the belt into the
aggregate steam.
2. Space the templates so the material between will yield an
increment of the required mass.
3. Carefully scoop the material between the templates into a
suitable container.
4. Collect the fines with a brush and dust pan and add to the
container.
5. Obtain a minimum of three approximately equal increments.
6. Combine the increments to form a field sample.
7. Ensure that the size of the field sample equals or exceeds
the approximate minimum mass needed or stated in Table 1.
Performance Checklist:
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Sampling of Aggregates:
Stockpiles (Manual Sampling)
7 Steps - correct answer- Course Aggregate
1. Shove a board vertically into the pile just above the sampling
point.
2. Take increments from the top third, mid-point, and bottom
third of the volume of the pile.
Fine Aggregate
3. Remove the outer layer and sample from the material
beneath.
4. Insert the appropriate sampling tube randomly to extract the
increments.
5. Obtain a minimum of five increments.
Coarse and Fine Aggregate
6. Combine the increments to form a field sample.
7. Ensure that the size of the field sample equals or exceeds
the approximate minimum mass needed or stated in Table 1.
