The Marshall method was used to design an asphalt concrete mixture. A PG 64-22 asphalt cement with a specific gravity (Gp) of 1.031 was used. The mixture contains a 9.5 mm nominal maximum particle size aggregate with a bulk specific gravity (Gab) of 2.696. The theoretical maximum specific gravity of the mix (Gmm) at asphalt con- tent of 5.0% is 2.470. Trial mixes were made with average results as shown in the following table: Asphalt Content (P.) (% by Weight of Mix) Bulk Specific Gravity (Gmb) Corrected Stability (kN) Flow (0.25 mm) 4.0 2.360 6.3 4.5 2.378 6.7 10 5.0 2.395 5.4 12 5.5 2.405 5.1 15 6.0 2.415 4.7 22 Determine the design asphalt content using the Asphalt Institute design criteria for medium traffic (Table 9.15). Assume a design air void content of 4% when using Table 9.16.
The Marshall method was used to design an asphalt concrete mixture. A PG 64-22 asphalt cement with a specific gravity (Gp) of 1.031 was used. The mixture contains a 9.5 mm nominal maximum particle size aggregate with a bulk specific gravity (Gab) of 2.696. The theoretical maximum specific gravity of the mix (Gmm) at asphalt con- tent of 5.0% is 2.470. Trial mixes were made with average results as shown in the following table: Asphalt Content (P.) (% by Weight of Mix) Bulk Specific Gravity (Gmb) Corrected Stability (kN) Flow (0.25 mm) 4.0 2.360 6.3 4.5 2.378 6.7 10 5.0 2.395 5.4 12 5.5 2.405 5.1 15 6.0 2.415 4.7 22 Determine the design asphalt content using the Asphalt Institute design criteria for medium traffic (Table 9.15). Assume a design air void content of 4% when using Table 9.16.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The Marshall method was used to design an asphalt concrete mixture. A PG 64-22
asphalt cement with a specific gravity (Gp) of 1.031 was used. The mixture contains
a 9.5 mm nominal maximum particle size aggregate with a bulk specific gravity (Gab)
of 2.696. The theoretical maximum specific gravity of the mix (Gmm) at asphalt con-
tent of 5.0% is 2.470. Trial mixes were made with average results as shown in the
following table:
Asphalt Content (P.)
(% by Weight of Mix)
Bulk Specific
Gravity (Gmb)
Corrected
Stability (kN)
Flow (0.25 mm)
4.0
2.360
6.3
4.5
2.378
6.7
10
5.0
2.395
5.4
12
5.5
2.405
5.1
15
6.0
2.415
4.7
22
Determine the design asphalt content using the Asphalt Institute design criteria for
medium traffic (Table 9.15). Assume a design air void content of 4% when using
Table 9.16.
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