The Marshall method was used to design an asphalt concrete mixture. A PG 64-22 asphalt cement with a specific gravity (Gb) of 1.031 was used. The mixture contains a 9.5 mm nominal maximum particle size aggregate with a bulk specific gravity (Gsb) of 2.696. The theoretical maximum specific gravity of the mix (Gmm) at asphalt content of 5.0% is 2.470. Trial mixes were made with average results as shown in the following table:Determine the design asphalt content using the Asphalt Institute design criteria formedium traffic Table . Assume a design air void content of 4% when usingTable Traffic LevelLightMediumНeavyCompaction(Blows)355075Minimum Maximum MinimumMaximum MinimumMaximumStability, kN(lb)3.345.348.01(750)(1,200)(1,800)Flow, 0.25 mm818816814(0.01 in.)Air Voids, %3353VMA, %Use the criteria in Table 9.16VFA, %7065786575 Minimum VMA, PercentNominal MaximumDesign Air Voids?Particle Size13.04.05.02.36 mm (No. 8)19.020.021.04.75 mm (No. 4)16.017.018.09.5 mm (3/8 in.)14.015.016.012.5 mm (1/2 in.)13.014.015.019.0 mm (3/4 in.)12.013.014.025.0 mm (1.0 in.)11.012.013.0'The nominal maximum particle size is one size larger than the firstsieve to retain more than 10%.2Interpolate minimum VMA for design air void values between those listed.

Given :- A specific gravity of PG 64-22 asphalt cement (Gb ) = 1.031 A bulk specific gravity (Gsb…

Answered: Traffic Level Light Medium Нeavy…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The Marshall method was used to design an asphalt concrete mixture. A PG 64-22 asphalt cement with a specific gravity (Gb) of 1.031 was used. The mixture contains a 9.5 mm nominal maximum particle size aggregate with a bulk specific gravity (Gsb) of 2.696. The theoretical maximum specific gravity of the mix (Gmm) at asphalt content of 5.0% is 2.470. Trial mixes were made with average results as shown in the following table:Determine the design asphalt content using the Asphalt Institute design criteria for
medium traffic Table . Assume a design air void content of 4% when using
Table

Traffic Level
Light
Medium
Нeavy
Compaction
(Blows)
35
50
75
Minimum Maximum Minimum
Maximum Minimum
Maximum
Stability, kN
(lb)
3.34
5.34
8.01
(750)
(1,200)
(1,800)
Flow, 0.25 mm
8
18
8
16
8
14
(0.01 in.)
Air Voids, %
3
3
5
3
VMA, %
Use the criteria in Table 9.16
VFA, %
70
65
78
65
75

Minimum VMA, Percent
Nominal Maximum
Design Air Voids?
Particle Size1
3.0
4.0
5.0
2.36 mm (No. 8)
19.0
20.0
21.0
4.75 mm (No. 4)
16.0
17.0
18.0
9.5 mm (3/8 in.)
14.0
15.0
16.0
12.5 mm (1/2 in.)
13.0
14.0
15.0
19.0 mm (3/4 in.)
12.0
13.0
14.0
25.0 mm (1.0 in.)
11.0
12.0
13.0
'The nominal maximum particle size is one size larger than the first
sieve to retain more than 10%.
2Interpolate minimum VMA for design air void values between those listed.

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