T 308 Binder Content Flashcards
The minimum test specimen size of an asphalt mixture with a nominal maximum aggregate size of half inch is?
1500 grams
To determine the asphalt binder content of an asphalt mixture the material is heated in the furnace until the binder liquefies and collects in a catch pan leaving behind the original blend of aggregates?
FALSE
Asphalt binder is burned at a temperature ___________ or to the temperature determined by the correction factor process?
538 ± 5°C
If the mixture is not sufficiently soft to separate with a spatula or trowel place it in a large flat pan in an oven at _________ until it is workable?
110 ± 5°C or 230 ± 9°F
Either plant produced or lab produced mixtures may be used for determining correction factors?
FALSE
When determining aggregate correction factors the blank aggregate specimen is subjected to the same burn off processed used for the binder correction specimens?
FALSE
The aggregate correction factors are _________?
Applied to the post burn residual aggregate gradations
Correction factors must be determined _____________?
Before any acceptance testing is performed
What is a binder correction factor?
Binder correction factor is used to offset the breakdown of material from the burn and is determined from a lab produced sample
What is a butter mix?
A butter mix is used to coat the bowl and tossed to help keep the actual sample from losing material to the to the bowl
What percent difference must your samples used to make a correction factor be within?
0.15% or less
What do you do if your samples are not within 0.15% of each other?
Run two more samples and throw out your highest and lowest results and use the two middle results to make your correction factors
What test method uses the aggregate correction factor?
T30
What is a blank aggregate specimen?
A blank is aggregate only specimen at the same JMF gradation used to perform a sieve analysis
How many samples must be prepped to create an aggregate correction factor?
At least three a blank aggregate sample gradation and two post burn samples
How is the Aggregate correction factor determined?
Each post burn gradation is this referenced to the blank sample blank aggregate sample minus specimen sample on each sieve
What is done after the difference is calculated for the two post burn gradation specimens?
Average of the difference of the two specimens on each sieve
Can you use a binder correction factor created with an oven scale versus the manual method?
No
What does a positive correction factor mean for aggregate correction?
Post burn percent passing for each sieve were less than the blank specimen
What does a negative correction factor mean for aggregate correction?
Indicates the post burn percent passing for that sieve was greater than the blank specimen
All correction factors will be applied unless otherwise noted where?
Special provisions
