ICO 6-7
CALCULATING AN ACF
1. Using the following equation, calculate and record the
aggregate correction factor for each correction sample:
ACF =%AC
0 – %ACT
where: ACF = Aggregate correction factor
%AC
0 = Asphalt content of sample as determined
by the oven
%ACT = True asphalt content
2. Determine the average ACF value
(ACFAVG)
as follows:
If the difference between the two ACF values is less
than 0.15%, then average the two values.
If the difference between the two ACF values is
greater than 0.15%, then prepare two additional
correction samples. Discard the high and low ACF
values, and then average the two remaining values.
3. Enter the ACF as described in the Create ACF section on
page 6-9. The oven will automatically adjust the asphalt
content measurements using the active ACF.
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