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
Chapter2: Loads On Structures
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Transcribed Image Text: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
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