Aashto T30 - Sieve Analysis of Extracted Agg

Question 1

Calculate percentages passing each sieve to the nearest________.

Answer 1

0.1 %

Question 2

Report percentages passing each sieve to the nearest_________, except for the percentag passing the No.200 sieve, which shall be reported to the nearest___________.

Answer 2

Whole number, 0.1 %

Question 3

Limit agitation by mechanical washing equipment to a maximum of _____ minutes.

Answer 3

10

Question 4

Agitate the contents of the container vigorously and immedialty decant the wash water over a nest two sieves of a ______to_______ upper sieve and a _________ lower sieve.

Answer 4

No. 8-16, No. 200.

Question 5

After completing the washing procedure, material retained on the nested sieves may be disregarded since it is a negligible amount.

Answer 5

False

Question 6

Excessive time (more than 10 mins.) to achieve adequate sieving may result in degradation of the sample.

Answer 6

True

Question 7

After shaking, the cumulative weight of material retained on each sieve must be within _______ of the sample mass after washing.

Answer 7

0.2%

Question 8

A wetting agent is any dispersing agent that will promote the separation of fine materials without_________the extracted agg or leaving a ___________on the sample during the washing procedure.

Answer 8

Degrading, residue

Question 9

If a particular sieve size will be overloaded during the testing, an imtermediate - sized sieve should be placed directly below that sieve.

Answer 9

False

Question 10

If the sample consists of aggregate obtained from T 308, the weight of the sample after drying to constant mass shall agree with the mass of agg remaining after ignition oven within_________.

Answer 10

0.1%

Question 11

What type of sample is typically processed using the T 30 procedure?

Answer 11

Residual aggregate from a T 308 ignition furnace test

Question 12

How is the sample obtained?

Answer 12

it must be carefully removed from the T 308 basket assembly

Question 13

The sample weight as tested must agree with the final T 309 weight within what percentage?

Answer 13

The sample must be within 0.1% of the T 308 final weight.

Question 14

If more than 24 hours have passed between the completion of T 308 and this test procedure or if the sample has been in a high-humidity environment, what should you do to the sample?

Answer 14

Dry to constant mass before proceeding

Question 15

Regarding the washing procedure, how does T 30 differ from T11?

Answer 15

T 30 requires the use of a wetting agent.

Question 16

According to the test method, what is an appropriate wetting agent?

Answer 16

Dispersing agent that will not degrade the sample or leave a residue.

Question 17

How much wetting agent should be added when washing the sample?

Answer 17

Enough to produce a small amount of suds when the sample is agitated

Question 18

What might happen if too much wetting agent is added to the wash?

Answer 18

Excessive suds may overflow the wash bowl or the sieves and carry material with them

Question 19

What is different between T 30 and T 27 regarding sample size?

Answer 19

T 30 samples are relatively small blends of coarse and fine aggregate that can be washed together, then dried and shaken through one sieve stack. T 27 samples containing coarse agg will be much larger and require separate processing for the fine fraction.

Question 20

What is different between T 30 and T 27 regarding reporting of the final gradation?

Answer 20

An agg correction factor must be applied to T 30 calculated percent passing before reporting the final gradation.

Question 21

Which test method is used to determine agg correction factors?

Answer 21

Aashto T 308