ATT Moisture Content & Specific Gravity

Question 1

Which ASTM standard is used to determine the moisture content of aggregates?

Accepted Answer

ASTM C566

Answer

ASTM C566 provides the standard test method for total moisture content of aggregates by drying.

Question 2

What condition must fine aggregate be in to determine surface moisture?

Accepted Answer

Saturated surface-dry

Answer

The saturated surface-dry (SSD) condition eliminates the influence of surface moisture for accurate calculations.

Question 3

What is the purpose of determining specific gravity of aggregates?

Accepted Answer

To measure density and absorption

Answer

Specific gravity helps in concrete mix design and quality control by measuring the density of the aggregate.

Question 4

Which test method determines the specific gravity of coarse aggregates?

Accepted Answer

ASTM C127

Answer

ASTM C127 outlines the procedure for determining specific gravity and absorption of coarse aggregates.

Question 5

What is the correct sequence of aggregate moisture conditions from driest to wettest?

Accepted Answer

Oven dry, air dry, SSD, wet

Answer

Oven dry, air dry, SSD, and then wet describe the increasing order of moisture content in aggregates.

(ATT) ACI Aggregate Testing Technician Practice Test