Asphalt Content by Ignition
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1
what parameters must be put into the ignition oven before placing a sample in
1. the temperature (538+-5C)
2. Calibration Factor (binder (agg.) correction factor)
2. Calibration Factor (binder (agg.) correction factor)
2
how do you enter calibration factor on an ncat?
pressing the "Calib Factor", typing in your factor and pressing enter
3
how do you set the temp?
by pressing temp and entering the JMF value then press enter
4
what weights must you get before doing an asphalt content by ignition test?
1. Sample basket weight
2. sample basket + sample weight (sample split between 2 baskets)
3. sample weight (2-1)
2. sample basket + sample weight (sample split between 2 baskets)
3. sample weight (2-1)
5
how far away from the basket walls does the sample need to be?
3/4"
6
before putting sample basket in the oven, what should you do?
1. zero oven scale (press 0)
2. put on PPE
2. put on PPE
7
when putting the sample in the oven, what must be ensured?
1. the basket is not touching the walls
2. door is shut properly
2. door is shut properly
8
once the sample is in the oven, what initiates the oven?
pressing the "START/STOP" button
9
what is the difference between using an oven scale and external scale?
oven scale: automatic, prints a ticket that records info for you
external: manual, heat @ 538C for 45 min, then in 15 min intervals find the % difference until constant mass
external: manual, heat @ 538C for 45 min, then in 15 min intervals find the % difference until constant mass
10
when burn-off is complete, what steps do you take?
1. remove and examine ticket
2. with ppe remove sample basket with fork to cool til room temp
2. with ppe remove sample basket with fork to cool til room temp
11
once your burn-off is cool, what are the final steps?
1. reweigh the basket + sample weight
2. subtract basket weight to find the burnoff sample weight
3. % oil is (Mi - Mf)/Mi *100
2. subtract basket weight to find the burnoff sample weight
3. % oil is (Mi - Mf)/Mi *100
12
once calibrated % AC is found from the burnoff, what must you do with the moisture content?
subtract moisture content from calibrated % AC
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