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ACI Aggregate Testing Technician Exam
Study Guide 100% Verified.
Performance Checklist:
Sampling of Aggregates:
Flowing Aggregate Stream (Bins or Belt Discharge)
5 steps - 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:
Sampling of Aggregates:
Conveyor Belt
1
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7 Steps - 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:
Sampling of Aggregates:
Stockpiles (Manual Sampling)
7 Steps - 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.
2
ACI Aggregate Testing Technician Exam
Study Guide 100% Verified.
Performance Checklist:
Sampling of Aggregates:
Flowing Aggregate Stream (Bins or Belt Discharge)
5 steps - 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:
Sampling of Aggregates:
Conveyor Belt
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:54PM.
7 Steps - 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:
Sampling of Aggregates:
Stockpiles (Manual Sampling)
7 Steps - 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.
2
