ACI AGGREGATE BASE TESTING
TECHNICIAN EXAMS SET 2026 PRACTICE
QUESTIONS AND ANSWERS FULL
SOLUTION
●● Performance Checklist:
Sampling of Aggregates:
Conveyor Belt
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.
, 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.
●● Performance Checklist:
Sampling of Aggregates:
Transportation Units (Manual Sampling)
7 Steps.
Answer: 1. Excavate a minimum of three trenches at points across the
unit that will give an estimate of the characteristics of the load.
TECHNICIAN EXAMS SET 2026 PRACTICE
QUESTIONS AND ANSWERS FULL
SOLUTION
●● Performance Checklist:
Sampling of Aggregates:
Conveyor Belt
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.
, 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.
●● Performance Checklist:
Sampling of Aggregates:
Transportation Units (Manual Sampling)
7 Steps.
Answer: 1. Excavate a minimum of three trenches at points across the
unit that will give an estimate of the characteristics of the load.
