ATT Fine Aggregate Quality Tests 2

Question 1

According to ASTM C117, what does the wash method for material finer than the No. 200 sieve measure?

Accepted Answer

Total clay and silt content washed through the sieve

Answer

ASTM C117 determines the amount of material finer than 75 µm (No. 200 sieve) by washing, which removes clay, silt, and dust of fracture.

Question 2

When performing the organic impurities test (ASTM C40), a color darker than the standard indicates:

Accepted Answer

The aggregate may be injurious and should be further tested

Answer

A color darker than the reference standard solution (Gardner Color Standard No. 11) suggests potentially harmful organic impurities requiring additional testing per ASTM C87.

Question 3

The fineness modulus of fine aggregate is calculated by summing the cumulative percentages retained on which sieves?

Accepted Answer

No. 100, No. 50, No. 30, No. 16, No. 8, No. 4

Answer

Fineness modulus uses cumulative percent retained on the No. 100, 50, 30, 16, 8, and 4 sieves, divided by 100.

Question 4

ASTM C128 determines which properties of fine aggregate?

Accepted Answer

Specific gravity and absorption capacity

Answer

ASTM C128 covers the determination of bulk and apparent specific gravity and absorption capacity of fine aggregate.

Question 5

In ASTM C128, the saturated surface-dry (SSD) condition of fine aggregate is detected using the cone test when:

Accepted Answer

The cone slumps slightly after the mold is lifted

Answer

At SSD, the sand cone slumps slightly — a perfect cone indicates surface moisture present; complete collapse means the aggregate is too dry.

(ATT) ACI Aggregate Testing Technician Practice Test

(ATT) ACI Aggregate Testing Technician Practice Test

ATT Fine Aggregate Quality Tests 2