PHASE II REPORT - Caltrans

Loss (%)
35
30
20
15
10
5
0
Effect of Support Dry Method
30 60 180
Time of Cure (Min) 77°F (25°C) 70% Humidity.
Figure 4.24: Effect of Support Base Type on Dry Loss Method, Mix M2
It was concluded that metal (Steel or Aluminum) support bases are easier to handle and create
less aggregate loss. The use of a metal support base is therefore recommended. The
Aluminum base is preferred because it is lighter and more resistant to corrosion.
The recommended assessment method is the Wet Loss Method. Even though both, the Wet
Loss Method and the Dry Loss Method had reproducible results, the Wet Loss Method was
preferred since immediate results can be obtained. A comparison of the loss measured with the
two methods shown in Figure 4.25.
62
Loss % of dry Felt
Loss % of dry Steel
Loss % of dry Aluminum