ATT Sampling Aggregates 1 — Questions and Answers
Question 1: Which ASTM standard outlines procedures for sampling aggregates?
- ASTM C136
- ASTM C117
- ASTM D75/D75M (Correct answer)
- ASTM C29
Correct answer: ASTM D75/D75M
ASTM D75/D75M specifies methods for sampling aggregates from various sources to ensure representative samples.
Question 2: When sampling from a stockpile, what is the most important principle to follow?
- Collect only from the top of the pile.
- Sample only dry areas.
- Collect from various depths and locations. (Correct answer)
- Take the sample from near the edges only.
Correct answer: Collect from various depths and locations.
Sampling from multiple locations and depths ensures the sample is representative of the entire stockpile.
Question 3: How should a field sample be reduced to testing size?
- By handpicking desired particles.
- By taking a single scoop from the center.
- Using a mechanical splitter or quartering method. (Correct answer)
- By mixing with water and decanting.
Correct answer: Using a mechanical splitter or quartering method.
Mechanical splitting or quartering methods must be used to reduce the sample without bias.
Question 4: Which of the following is a valid sampling location for aggregate in transport?
- Only from a moving belt conveyor.
- From the bottom of a wet stockpile.
- From a stopped conveyor or truck bed. (Correct answer)
- From the front loader bucket.
Correct answer: From a stopped conveyor or truck bed.
Sampling from a stopped conveyor or transport vehicle ensures a more uniform and accessible sample.
Question 5: Why must aggregate samples be protected from moisture loss?
- To prevent segregation of particles.
- To maintain accurate test results. (Correct answer)
- To preserve chemical content.
- To avoid staining the containers.
Correct answer: To maintain accurate test results.
Moisture loss alters weight and affects tests like specific gravity or moisture content, leading to inaccurate results.
Question 6: What is the minimum number of increments required when sampling from a flowing stream?
- Three
- Four
- Five (Correct answer)
- Ten
Correct answer: Five
A minimum of five equal increments must be taken to ensure a proper composite sample per ASTM D75.
ATT Sampling Aggregates 1
Which ASTM standard outlines procedures for sampling aggregates?