UFC 3-250-03
15 May 2001
Table 6-3
Application Rates for 50-millimeter- (2-inch)- Thick Course
Asphalt Material
Aggregate,
Placing Operations
liters/sq m (gal/sq yd)
kg/sq m (lb/sq yd)
First spreading
--
90-95 (165-175)
First application
4.98-5.89 (1.10-1.30)
--
Second spreading
8-13.5 (15-25)
--
Second application
1.36-2.26 (0.30-0.50)
--
Third spreading
6.5-11 (12-20)
--
Third application
1.13-2.04 (0.25-0.45)
--
Fourth spreading
5.5-11 (10-20)
Table 6-4
Application Rates for 64-millimeter (2-1/2-inch-) Thick Course
Asphalt Material
Aggregate,
Placing Operations
liters/sq m (gal/sq yd)
kg/sq m (lb/sq yd)
First spreading
--
111-117 (205-215)
First application
6.34-7.24 (1.40-1.60)
--
Second spreading
11-16 (20-30)
--
Second application
1.81-2.72 (0.40-0.60)
--
Third spreading
8-13.5 (15-25)
--
Third application
1.36-2.26 (0.30-0.50)
--
Fourth spreading
11-16 (20-30)
distributors. In addition, the Asphalt Institute's Manual Series No. 13 offers guidance for calibrating and
checking application equipment.
(3) Rolling is necessary to seat the aggregate, but the first or main course of coarse aggregate
should not be closed by rolling. Rolling should be continued only long enough to seat the coarse
aggregate, and the aggregate should be left open enough to permit ready penetration of the first
application of asphalt and entrance and interlocking of the key aggregate. Immediately following the first
application of asphalt the key aggregate should be uniformly spread and rolled. The key aggregate will
be applied in two applications, each preceded by an application of asphalt. The final course of
aggregate is the fine aggregate which immediately follows the third application of asphalt.
5. ROCK-ASPHALT. Rock-asphalt pavement is composed of crushed, natural asphalt-impregnated
limestone or sandstone, or a combination of these, used alone or mixed with additional asphalt or flux
oil. Rock-asphalt pavement is laid cold in the same manner as cold-laid asphalt mixture. Rock asphalt
will only be used in surface courses for roads and will not be constructed over 38 and 50 millimeters
(1-1/2 and 2 inches) thick for blended and fluxed rock asphalt, respectively. Kentucky, Alabama, Texas,
6-4
Previous Page
