Problem 1 A highway has the following pavement design daily traffic: 300 single axles at 10,000 lb each, 120 single axles at 18,000 lb each, 100 single axles at 23,000 Ib each, 100 tandem axles at 32,000 lb each, 30 single axles at 32,000 lb each, and 100 triple axles at 40,000 lb each. A flexible pavement is designed to have 4 inches of sand-mix asphalt wearing surface, 6 inches of soilcement base, and 7 inches of crushed stone subbase. The pavement has a 10-year design life, a reliability of 85%, an overall standard deviation of 0.30, drainage coefficients of 1.0, an initial PSI of 4.7, and a TSI of 2.5. What is the minimum acceptable soil resilient modulus? Problem 2. Consider the loading conditions in Problem 1. A rigid pavement is used with a modulus of subgrade reaction of 200 lb/in', a slab thickness of 8 inches, a load transfer coefficient of 3.2, a modulus of elasticity of 5 million Ib/in2, a modulus of rupture of 600 lb/in', and a drainage coefficient of 1.0. How many years is the pavement expected to last using the same reliability as in Problem 1? (Assume all other factors are as in Problem 1)
Problem 1 A highway has the following pavement design daily traffic: 300 single axles at 10,000 lb each, 120 single axles at 18,000 lb each, 100 single axles at 23,000 Ib each, 100 tandem axles at 32,000 lb each, 30 single axles at 32,000 lb each, and 100 triple axles at 40,000 lb each. A flexible pavement is designed to have 4 inches of sand-mix asphalt wearing surface, 6 inches of soilcement base, and 7 inches of crushed stone subbase. The pavement has a 10-year design life, a reliability of 85%, an overall standard deviation of 0.30, drainage coefficients of 1.0, an initial PSI of 4.7, and a TSI of 2.5. What is the minimum acceptable soil resilient modulus? Problem 2. Consider the loading conditions in Problem 1. A rigid pavement is used with a modulus of subgrade reaction of 200 lb/in', a slab thickness of 8 inches, a load transfer coefficient of 3.2, a modulus of elasticity of 5 million Ib/in2, a modulus of rupture of 600 lb/in', and a drainage coefficient of 1.0. How many years is the pavement expected to last using the same reliability as in Problem 1? (Assume all other factors are as in Problem 1)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Problem 1
A highway has the following pavement design daily traffic: 300 single axles at 10,000 lb each,
120 single axles at 18,000 lb each, 100 single axles at 23,000 lb each, 100 tandem axles at
32,000 lb each, 30 single axles at 32,000 lb each, and 100 triple axles at 40,000 lb each. A
flexible pavement is designed to have 4 inches of sand-mix asphalt wearing surface, 6 inches of
soilcement base, and 7 inches of crushed stone subbase. The pavement has a 10-year design
life, a reliability of 85%, an overall standard deviation of 0.30, drainage coefficients of 1.0, an
initial PSI of 4.7, and a TSI of 2.5. What is the minimum acceptable soil resilient modulus?
Problem 2.
Consider the loading conditions in Problem 1. A rigid pavement is used with a modulus of
subgrade reaction of 200 lb/in', a slab thickness of 8 inches, a load transfer coefficient of 3.2, a
modulus of elasticity of 5 million Ib/in2, a modulus of rupture of 600 lb/in', and a drainage
coefficient of 1.0. How many years is the pavement expected to last using the same reliability as
in Problem 1? (Assume all other factors are as in Problem 1)
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