Traffic And Highway Engineering
Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 19, Problem 14P
To determine

The design of a flexible pavement using the 1993 AASHTO procedure.

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Q2: The traffic on the design lane of a proposed four-lane rural interstate highway consists of 40% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1150, pi = 4.5, and pt = 2.5 .   Growth rate = 3%   Design life = 20 years   Reliability level = 95%   Standard deviation = 0.45   The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water.   Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 and 22, respectively, and Mr for the asphalt mixture, 3102 MPa (450,000 lb/in2).
The traffic on the design lane of a proposed four-lane rural interstate highway consists of 40% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1000, pi=4.2 and pt=2.5. Growth rate= 4% Design life= 20 years Reliabilitylevel= 90% Standard deviation= 0.45 The pavement will be exposed to moisture levels approaching saturation 20% of the time, and will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 and 22, respectively, and Mr for the asphalt mixture, 450kips/in2.
The traffic on the design lane of a proposed four-lane rural interstate highway consists of 25% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1885, pi = 4.2. Growth rate = 6.5% %3D SN, Design life = 20 yrs Reliability level = 95% Standard deviation = 0.45 Surface course DI %3D SN2 %3D D2 %3D SN3 Base course Subbase course D3 Roadbed course The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase courses are 70 and 22, respectively, and Mr for the asphalt mixture, 3102 MPa (450,000 lb/in?).
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Traffic and Highway Engineering
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Publisher:Cengage Learning