1110-l-139
22 Jun 90
Chapter 2
EXAMPLE ANALYSES FOR SELECTING AN ASPHALT CEMENT
Example 1.
Calculating Pavement Temperature Index
The method for calculating the pavement temperature index for two con-
struction sites is given in this example.
The average monthly maximum temperature and the difference above 75" F
(23.9" C) for Site A and Site B are given below.
Site B
Site A
Avg. Max.
Avg. Max.
Temperature
Difference
Difference
Temperature
Above 75" F
Month
Above 75" F
29.8
Jan
60.5
27.8
68.5
Feb
--
Mar
73.7
43.0
58.2
79.9
4.9
67.2
13.5
88.5
19.5
70.4
Jun
94.5
2.0
77.0
Jul
22.6
97.6
17.0
74.2
92.0
66.9
15.2
90.2
5.3
57.5
80.3
--
Nov
43.4
74.0
36.8
60.3
Cumulative Total
98.0
The temperature index at these sites is the sum of the increments of
average monthly maximums above 75" F; therefore, the pavement temperature
index for each site is as follows:
Site A = 98.0, cumulative
Site B
2.0, cumulative
(1.1, cumulative
Based on Table 4 of Enclosure 1, Site A is a hot region, and Site B is a cold
region. Site B requires the use of the PVN method to select an asphalt
cement.
Example 2.
Asphalt Cement Selection in a Hot Region
A parking lot should be built in a region that has a pavement temperature
index of 98, cumulative
(54.4, cumulative
Enclosure 2
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