ATT Sampling Aggregates

Question 1

Which ASTM standard outlines procedures for sampling aggregates?

Accepted Answer

ASTM D75/D75M

Answer

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?

Accepted Answer

Collect from various depths and locations.

Answer

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?

Accepted Answer

Using a mechanical splitter or quartering method.

Answer

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?

Accepted Answer

From a stopped conveyor or truck bed.

Answer

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?

Accepted Answer

To maintain accurate test results.

Answer

Moisture loss alters weight and affects tests like specific gravity or moisture content, leading to inaccurate results.

(ATT) ACI Aggregate Testing Technician Practice Test