Q1: Design the pavement for an expressway consisting of an asphalt concrete surface, a crushed stone base, and a granular subbase using the 1993 AASHTO design method. The cumulative ESAL in the design lane for a design period of 15 years is 7x106. The area has good quality drainage with 10% of the time the moisture level is approaching saturation. The effective roadbed soil resilient modulus is 7 ksi, the subbase has a CBR value of 80, the resilient modulus of the base is 40×103 psi, and the resilient modulus of asphalt concrete is 4.5×105 psi. Assume a reliability level of 95%, So of 0.45, po = 4.6, and pt = 3.0.

Q1: Design the pavement for an expressway consisting of an asphalt concrete surface, a crushed stone base, and a granular subbase using the 1993 AASHTO design method. The cumulative ESAL in the design lane for a design period of 15 years is 7x106. The area has good quality drainage with 10% of the time the moisture level is approaching saturation. The effective roadbed soil resilient modulus is 7 ksi, the subbase has a CBR value of 80, the resilient modulus of the base is 40×103 psi, and the resilient modulus of asphalt concrete is 4.5×105 psi. Assume a reliability level of 95%, So of 0.45, po = 4.6, and pt = 3.0.

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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section of a two-lane rural highway is to be realigned and replaced by a four-lane highway with a full-depth asphalt pavement. 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. It is expected that construction will be completed five years from now, and pi =4.5 and pt = 2.5. Growth rate = 4%. Design life = 20 years. 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 (Mr=30000 lb/in2 ) and 22 (Mr=13500 lb/in2 ), respectively, and Mr for the asphalt mixture, 400,000 lb/in2 .
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