ETL 1110-l-139
22 Jun 90
and
0.61094
( P E N)
3.46289
LOG
where PEN
penetration at 77" F (25" C) of a given asphalt cement.
Calculated PVN values of the two available asphalt cements are:
PVN
-0.638 for AC-2.5
-0.081 for
PVN
Based on Table 5 of Enclosure 1, an asphalt cement that has a PVN greater
than -0.5 and lies on or to the right of the minimum temperature diagonal line
should be selected. The AC-5 asphalt cement is selected because it has a PVN
of -0.081 and lies to the right of the -22" F temperature diagonal line. This
asphalt cement satisfies the requirements of Table 5 and should prevent
temperature pavement cracking.
Asphalt Cement Selection in a Warm Region
Example 5.
A parking lot should be constructed in a region that has a pavement tem-
perature index of 42, cumulative
(23.3, cumulative
An asphalt supplier can provide asphalt cements that meet the require-
ments in Table 2 of Enclosure 1. Viscosity and penetration data for the
asphalt cements are given below.
AR-2000
AR-4000
AR-1000
3,544
1,962
851
F, P
Viscosity,
247
334
162
275" F,
Penetration, 77" F, 0.1 mm
87
53
141
Original
55
39
99
Residue
Based on Table 4 of Enclosure 1, an asphalt cement.that has a penetration of
approximately 85 to 100 should be selected. The AR-2000 asphalt cement is
selected based on the original penetration of the material.
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