ACI Aggregate Testing
Technician
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:
Technician
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:
