UFC 3-270-01
15 March 2001
5.6. Procedural Steps (DBST). The following steps should be conducted for placement of a
DBST.
5.6.1. Prepare the area. This is the same as for SBST (Paragraph 5.3.1.).
5.6.2. Apply the binder material. This is the same as discussed for SBST (Paragraph 5.3.2.),
except two applications of binder and aggregate are placed with rates as follows:
Table 5.4. DBST Binder and Aggregate Application Rates
First Application
Bituminous Material*
Aggregate
gal/yd2 (l/m2)
lb/yd2 (kg/m2)
Gradation No.
1
0.20 - 0.30 (0.91 - 1.36)
40 - 50 (22 - 27)
3
0.15 - 0.20 (0.68 - 0.91)
25 - 30 (14 -16)
Second Application
Bituminous Material**
Aggregate
gal/yd2 (l/m2)
lb/yd2 (kg/m2)
Gradation No.
2
0.30 - 0.45 (1.36 - 2.04)
20 - 25 (11 - 14)
4
0.20 - 0.30 (0.91 - 1.36)
15 - 20 (8 - 11)
* If an emulsion is used, increase the application rate by 10 percent.
** Second application shall be 50 percent greater than first application.
NOTE: Graduations shall be used in pairs. If gradation 1 is used for the first application, then
gradation 2 must be used for the second application and the same for gradations 3 and 4.
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