UFC 3-250-03
15 May 2001
b. Aggregate absorption requirements. The aggregate gradation includes 2 percent portland
cement.
Weight Before
Weight After
Tare Weight
Sample Weight
Centrifuging
Centrifuging
KA
Cup No.
Grams
Grams
Grams
Grams
Percent
(a)
(b)
(c)
(d = b + c)
(e)
(f = e - d)
1
215.3
100.0
315.3
321.0
5.7
2
215.9
100.0
315.9
321.6
5.7
Average KA
5.7
c. Total asphalt requirements. The factors involved in calculating the asphalt contents are as
follows:
(1) Asphalt = SS-lh asphalt emulsion.
(2) Design film thickness (t) = 8 microns.
(3) Apparent specific gravity of aggregate (ASG) = 2.96.
(4) Specific gravity of asphalt (SGA) = 1.028.
(5) Kerosene absorption (KA) = 5.7 percent.
(6) Corrected surface area (CSA) =
Metric: 8.310 square meters per kilogram of aggregate
U.S. Customary: 40.57 square feet per pound of aggregate.
(7) Total asphalt required (AR) =
Metric: (CSA x t x SGA x 0.99941) + KA
U.S. Customary: (CSA x t x SGA x 0.02047) + KA
(8) AR =
Metric: (8.310 x 8 x 1.028 x 0.99941) + 5.7 = 6.83 + 5.7 = 12.53 percent.
U.S. Customary: (40.57 x 8 x 1.028 x 0.02047) + 5.7 = 6.83 + 5.7 =
12.53 percent.
(9) AR = 12.53 percent of dry aggregate weight.
(10) Residue asphalt content in emulsion = 63 percent by weight.
AR 100
(11) Emulsion required =
Residue asphalt
content in emulsion
12.53 100
(12) Emulsion required =
= 19.9 percent of dry aggregate weight, that is,
63
19.9 kilograms (pounds) of emulsion is required for every 100 kilograms (pounds) of dry aggregate.
C-4
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