Using the AASHTO design procedure design a new flexible pavement for a major interstate highway using the following conditions: Pavement location: Urban Pavement functional classification: Interstate Number of lanes: 3 lanes in each direction Annual growth rate: Assume 2% Design period: 30 years Construction Materials: Surface course: HMA mix with a nominal maximum aggregate size of 1/2 inch, with E- 500,000 psi Binder course: Dense graded HMA mix with a nominal maximum aggregate size of 1 inch. Use E 500,000 psi Base course: Crushed aggregate with MR -28,000 psi Subbase course: Not used Subgrade: MR 15,000 psi in the dry months of May through October Mx 12,500 psi in the wet months of November through April Reliability: R 90% Overall standard deviation (S.): 0.45 (typical for flexible pavements) Traffic count: Single unit trucks (assume 0.40 ESALS per truck) - 1872/day Double unit trucks (assume 1.00 ESALS per truck) - 1762/day Truck trains - trucks with more than 2 units (assume 1.75 ESALS per truck)-247/day Drainage condition: Time to drain is 1 week, the pavement is expected to be saturated about 15% of the time

Using the AASHTO design procedure design a new flexible pavement for a major interstate highway using the following conditions: Pavement location: Urban Pavement functional classification: Interstate Number of lanes: 3 lanes in each direction Annual growth rate: Assume 2% Design period: 30 years Construction Materials: Surface course: HMA mix with a nominal maximum aggregate size of 1/2 inch, with E- 500,000 psi Binder course: Dense graded HMA mix with a nominal maximum aggregate size of 1 inch. Use E 500,000 psi Base course: Crushed aggregate with MR -28,000 psi Subbase course: Not used Subgrade: MR 15,000 psi in the dry months of May through October Mx 12,500 psi in the wet months of November through April Reliability: R 90% Overall standard deviation (S.): 0.45 (typical for flexible pavements) Traffic count: Single unit trucks (assume 0.40 ESALS per truck) - 1872/day Double unit trucks (assume 1.00 ESALS per truck) - 1762/day Truck trains - trucks with more than 2 units (assume 1.75 ESALS per truck)-247/day Drainage condition: Time to drain is 1 week, the pavement is expected to be saturated about 15% of the time

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter19: Design Of Flexible Highway Pavements

Section: Chapter Questions

Problem 16P

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