18. Refer to Tables 2-1.1 and 2-1.2 and Figure 18.9 attached. What would be the thickness of asphalt  concrete according to the Asphalt Institute required to support 950,000 ESAL over a 4-inch granular  base? Use the resilient modulus data provided in Table 2-1.2 to perform your calculations. Select the  best answer. a. 4.0 inches b. 5.0 inches c. 7.0 inches d. 12.0 inches

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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18. Refer to Tables 2-1.1 and 2-1.2 and Figure 18.9 attached. What would be the thickness of asphalt 
concrete according to the Asphalt Institute required to support 950,000 ESAL over a 4-inch granular 
base? Use the resilient modulus data provided in Table 2-1.2 to perform your calculations. Select the 
best answer.
a. 4.0 inches
b. 5.0 inches
c. 7.0 inches
d. 12.0 inches

Figure 18.9 Design Chart for Pavements with Asphalt Concrete Surface and Untreated Aggregate Base 4 in. Thick
Subgrade Resilient Modulus, M, (lb/in.2)
dominfraraumbririh r
PETO PAPI
Asphalt Concrete
Untreated Base
Subgrade
3 ln. minimum
345678910¹
4 incies
4 in. minimum
5 in
45678910
2
3 In.
5678910
Equivalent 18,000 lb Single-Axle Load
9 in
2
บ 01
1
11 in.
12 In.
13 In
6
14 In.
910'
내외
16 in.
VIZL
2
15
College Park, Md., September 1981.
Source: Reproduced from Thickness Design-Asphalt Pavements for Highways and Streets, Manual Series No. 1, The Asphalt Institute,
5 6 7 8 910
Transcribed Image Text:Figure 18.9 Design Chart for Pavements with Asphalt Concrete Surface and Untreated Aggregate Base 4 in. Thick Subgrade Resilient Modulus, M, (lb/in.2) dominfraraumbririh r PETO PAPI Asphalt Concrete Untreated Base Subgrade 3 ln. minimum 345678910¹ 4 incies 4 in. minimum 5 in 45678910 2 3 In. 5678910 Equivalent 18,000 lb Single-Axle Load 9 in 2 บ 01 1 11 in. 12 In. 13 In 6 14 In. 910' 내외 16 in. VIZL 2 15 College Park, Md., September 1981. Source: Reproduced from Thickness Design-Asphalt Pavements for Highways and Streets, Manual Series No. 1, The Asphalt Institute, 5 6 7 8 910
Table 2-1.1
Table 2-1.2
Traffic Level,
ESALS
< 10,000
10,000 - 1,000,000
> 1,000,000
Test Value, Mr
psi
16200
15700
14900
14100
13000
12000
11000
10000
Design Subgrade
Value, Percent
60
75
87.5
Number Equal to or
Greater Than
1
2
3
4
5
6
7
8
Percent Equal To or
Greater Than
12.5
25
37.5
50
62.5
75
87.5
100
Transcribed Image Text:Table 2-1.1 Table 2-1.2 Traffic Level, ESALS < 10,000 10,000 - 1,000,000 > 1,000,000 Test Value, Mr psi 16200 15700 14900 14100 13000 12000 11000 10000 Design Subgrade Value, Percent 60 75 87.5 Number Equal to or Greater Than 1 2 3 4 5 6 7 8 Percent Equal To or Greater Than 12.5 25 37.5 50 62.5 75 87.5 100
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