Aashto T30 - Sieve Analysis of Extracted Agg Flashcards
Calculate percentages passing each sieve to the nearest________.
0.1 %
Report percentages passing each sieve to the nearest_________, except for the percentag passing the No.200 sieve, which shall be reported to the nearest___________.
Whole number, 0.1 %
Limit agitation by mechanical washing equipment to a maximum of _____ minutes.
10
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.
No. 8-16, No. 200.
After completing the washing procedure, material retained on the nested sieves may be disregarded since it is a negligible amount.
False
Excessive time (more than 10 mins.) to achieve adequate sieving may result in degradation of the sample.
True
After shaking, the cumulative weight of material retained on each sieve must be within _______ of the sample mass after washing.
0.2%
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.
Degrading, residue
If a particular sieve size will be overloaded during the testing, an imtermediate - sized sieve should be placed directly below that sieve.
False
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_________.
0.1%
What type of sample is typically processed using the T 30 procedure?
Residual aggregate from a T 308 ignition furnace test
How is the sample obtained?
it must be carefully removed from the T 308 basket assembly
The sample weight as tested must agree with the final T 309 weight within what percentage?
The sample must be within 0.1% of the T 308 final weight.
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?
Dry to constant mass before proceeding
Regarding the washing procedure, how does T 30 differ from T11?
T 30 requires the use of a wetting agent.
According to the test method, what is an appropriate wetting agent?
Dispersing agent that will not degrade the sample or leave a residue.
How much wetting agent should be added when washing the sample?
Enough to produce a small amount of suds when the sample is agitated
What might happen if too much wetting agent is added to the wash?
Excessive suds may overflow the wash bowl or the sieves and carry material with them
What is different between T 30 and T 27 regarding sample size?
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.
What is different between T 30 and T 27 regarding reporting of the final gradation?
An agg correction factor must be applied to T 30 calculated percent passing before reporting the final gradation.
Which test method is used to determine agg correction factors?
Aashto T 308
