ATT Materials Finer Than No. 200 Sieve (Washing Test)

Question 1

Which ASTM standard governs the test for materials finer than the 75-µm (No. 200) sieve in mineral aggregates by washing?

Accepted Answer

ASTM C117

Answer

ASTM C136

Answer

ASTM C127

Answer

ASTM C131

Question 2

What is the minimum sample size for a washing test on a fine aggregate (maximum size 3/8 in.) per ASTM C117?

Accepted Answer

300 g

Answer

100 g

Answer

200 g

Answer

500 g

Question 3

During the ASTM C117 washing test, the aggregate is washed over which sieve to capture all fine material?

Accepted Answer

No. 200 (75 µm)

Answer

No. 100 (150 µm)

Answer

No. 325 (45 µm)

Answer

No. 50 (300 µm)

Question 4

After washing, the retained aggregate must be dried to a constant mass at what temperature range?

Accepted Answer

110 ± 5°C (230 ± 9°F)

Answer

90 ± 5°C (194 ± 9°F)

Answer

130 ± 5°C (266 ± 9°F)

Answer

150 ± 5°C (302 ± 9°F)

Question 5

The percentage of material finer than the No. 200 sieve by washing is calculated using which formula?

Accepted Answer

(A − B) / A × 100

Answer

(B − A) / B × 100

Answer

(A + B) / A × 100

Answer

(A − B) / B × 100

Question 6

Which type of material is primarily removed during the ASTM C117 washing procedure that could not be removed by dry sieving alone?

Accepted Answer

Clay coatings and silt adhering to larger particles

Answer

Coarse particles bonded by cement

Answer

Organic materials floating on the surface

Answer

Oversized particles larger than 1.5 in.

Question 7

If the original oven-dry mass of a fine aggregate sample is 498 g and the oven-dry mass after washing is 485 g, what is the percentage of material finer than the No. 200 sieve?

Accepted Answer

2.6%

Answer

2.0%

Answer

2.8%

Answer

3.2%