ACI Aggregate Testing Technician Final Exam
Questions with Correct Answers
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:
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:
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.
Questions with Correct Answers
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:
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:
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.
