ATT Materials Finer Than No. 200 Sieve (Washing Test) 2

Question 1

For coarse aggregate with a nominal maximum size of 1 in., what minimum sample mass is required for the ASTM C117 washing test?

Accepted Answer

2000 g

Answer

500 g

Answer

1000 g

Answer

5000 g

Question 2

When combining results of the ASTM C117 wash test with a dry ASTM C136 sieve analysis, how is the total percent passing the No. 200 sieve reported?

Accepted Answer

The wash test value is used as it captures more fines than dry sieving

Answer

Only the dry sieve result is used

Answer

Only the wash test result is used

Answer

The average of both values is reported

Question 3

What is the purpose of using a large enough container during the washing operation in ASTM C117?

Accepted Answer

To allow complete immersion and vigorous agitation without losing aggregate over the rim

Answer

To prevent aggregate from absorbing too much water

Answer

To slow the rate of washing so fines settle before decanting

Answer

To maintain a constant water temperature during washing

Question 4

How many times should washing and decanting be repeated per ASTM C117 until the process is considered complete?

Accepted Answer

Until the wash water is clear

Answer

Exactly once

Answer

Exactly three times

Answer

Until the No. 200 sieve shows no visible fines

Question 5

Which sieve must be placed beneath the No. 200 sieve to prevent damage during the ASTM C117 wash procedure?

Accepted Answer

No. 100 sieve

Answer

No. 50 sieve

Answer

No. 16 sieve

Answer

No. 4 sieve

Question 6

What would cause a higher-than-actual result in the ASTM C117 wash test?

Accepted Answer

Incomplete drying of the sample before the initial weighing

Answer

Failing to nest the No. 100 sieve under the No. 200

Answer

Washing the sample more times than necessary

Answer

Using distilled water instead of tap water

Question 7

ASTM specifications for concrete aggregates typically limit material finer than No. 200 in fine aggregate to a maximum of what percentage (for concrete subject to abrasion)?

Accepted Answer

3.0%

Answer

1.5%

Answer

2.0%

Answer

5.0%