ACI AGGREGATE TESTING TECHNICIAN EXAM QUESTIONS AND
ANSWERS 100% PASS
Performance Checklist:
Sampling of Aggregates:
Flowing Aggregate Stream (Bins or Belt Discharge)
5 steps
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:
,Sampling of Aggregates:
Conveyor Belt
7 Steps
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:
, Sampling of Aggregates:
Stockpiles (Manual Sampling)
7 Steps
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.
ANSWERS 100% PASS
Performance Checklist:
Sampling of Aggregates:
Flowing Aggregate Stream (Bins or Belt Discharge)
5 steps
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:
,Sampling of Aggregates:
Conveyor Belt
7 Steps
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:
, Sampling of Aggregates:
Stockpiles (Manual Sampling)
7 Steps
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.
