Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 4, Problem 12P
To determine
The slab thickness of the rigid pavement.
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You have been asked to design the pavement for an access highway to a major truck terminal. The design daily truck traffic consists of the following: 80 single axles at 22,500 lb each, 570 tandem axles at 25,000 lb each, 50 tandem axles at 39,000 lb each, and 80 triple axles at 48,000 lb each. The highway is to be designed with rigid pavement having a modulus of rupture of 600 lb/in2 and a modulus of elasticity of 5 million lb/in2. The reliability is to be 95%, the overall standard deviation is 0.4, the drainage coefficient is 0.9, ΔPSI is 1.7 (with a TSI of 2.5), and the load transfer coefficient is 3.2. The modulus of subgrade reaction is 200 lb/in3. If a 20-year design life is to be used, determine the required slab thickness.
3. You have been asked to design the pavement for an access highway to a major truck terminal. The design daily
truck traffic consists of the following: 80 single axles at 22,500 lb each, 570 tandem axles at 25,000 lb each, 50
tandem axles at 39,000 lb each, and 80 triple axles at 48,050 lb each. The highway is to be designed with rigid
pavement having a modulus of rupture of 600 lb/in? and a modulus of elasticity of 5 million lb/in. The reliability
is to be 95%, the overall standard deviation is 0.4, the drainage coefficient is 0.9, APSI is 1.7 (with a TSI of 2.5).
and the load transfer coefficient is 3.2. The modulus of subgrade reaction is 200 lb/in'. If a 20-year design life is
to be used, determine the required slab thickness.
The AADTT of a 2-way (2-lane each way) highway is 10,000. The directional distribution may
vary between 45 and 55% depending on season. The lane distribution may vary between 60 and
75%. The driving lane always carries more loads compared to the passing lane. The growth
factor for the pavement is 3.5%. Based on the above information, calculate the design AADTT
for the driving lane if the pavement service life is 20 years.
Chapter 4 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
Ch. 4 - Prob. 1PCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10P
Ch. 4 - Prob. 11PCh. 4 - Prob. 12PCh. 4 - Prob. 13PCh. 4 - Prob. 14PCh. 4 - Prob. 15PCh. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - Prob. 18PCh. 4 - Prob. 19PCh. 4 - Prob. 20PCh. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - Prob. 24PCh. 4 - Prob. 25PCh. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Prob. 31PCh. 4 - Prob. 32P
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- Problem 3. A rigid pavement is to be designed to provide a service life and has an initial PSI of 4.4 and a TSI of 2.5. The modulus of subgrade reaction is determined to be 300 lb/in³. For design, the daily car, pickup truck, and light van traffic is 20,000; and the daily truck traffic consists of 200 passes of single-unit trucks with single and tandem axles, and 410 passes of tractor semi-trailer trucks with single, tandem, and triple axles. The axle weights are cars, pickups, light vans = two 2000-lb single axles (equivalency factor = 0.0002) single-unit trucks = 10,000-lb steering, single axle (equivalency factor = 0.081) = 22,000-lb drive, tandem axle (equivalency factor = 0.305) tractor semi-trailer trucks = 12,000-lb steering, single axle (equivalency factor = 0.1750) = 18,000-lb drive, tandem axle (equivalency factor = 0.132) = 50,000-lb trailer, triple axle (equivalency factor = 3.02)arrow_forwardA flexible pavement was designed for the following daily traffic with a 12-year design life: 1300 single axles at 8,000 lb each, 900 tandem axles at 15,000 lb each, 20 single axles at 40,000 lb each, and 200 tandem axles at 40,000 lb each. The highway was designed with 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase. The reliability was 70%, overall standard deviation was 0.5, ¨PSI was 2.0 (with a TSI of 2.5), and all drainage coefficients were 1.0. What was the soil resilient modulus of the subgrade used in design?arrow_forwardYou have been asked to design the pavement for an access highway to a major truck terminal. The design daily truck traffic consists of the following: 80 single axles at 22,500 lb each, 570 tandem axles at 25,000 lb each, 50 tandem axles at 39,000 lb each, and 80 triple axles at 48,000 lb each. The highway is to be designed with rigid pavement having a modulus of rupture of 600lb/in2 and a modulus of elasticity of 5 million lb/in2. The reliability is to be 95%, the overall standard deviation is 0.4, the drainage coefficient is 0.9, ¨PSI is 1.7 (with a TSI of 2.5), and the load transfer coefficient is 3.2. The modulus of subgrade reaction is 200 lb/in3. If a 20-year design life is to be used, determine the required slab thicknessarrow_forward
- A flexible pavement was designed for the following daily traffic with a 12-year design life: 1300 single axles at 8,000 Ib each, 900 tandem axles at 15,000 lb each, 20 single axles at 40,000 Ib each, and 200 tandem axles at 40,000 Ib each. The highway was designed with 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase. The reliability was 70%, overall standard deviation was 0.5, "PSI was 2.0 (with a TSI of 2.5), and all drainage coefficients were 1.0. What was the soil resilient modulus of the subgrade used in design?arrow_forwardA flexible pavement was designed for the following daily traffic with a 12-year design life: 1300 single axles at 8,000 lb each, 900 tandem axles at 15,000 lb each, 20 single axles at 40,000 lb each, and 200 tandem axles at 40,000 lb each. The highway was designed with 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase. The reliability was 70%, overall standard deviation was 0.5, " PSI was 2.0 (with a TSI of 2.5), and all drainage coefficients were 1.0. What was the soil resilient modulus of the subgrade used in design?arrow_forward2 Describe the basic types of highway concrete pavements and give the conditions underwhich each type will be constructedarrow_forward
- A flexible pavement has the following class loads during a particular hour of the day. i. ii. 80 buses with 2-axles (each axle load of 40 kN) ; ii. 160 trucks with 2-axles (from and rear axle loads of 40 kN and 80 kN, respectively) Find the equivalent standard axle load repetitions for this vehicle combination as per IRC 37-2012.arrow_forward12. Refer to Figure II-1 attached. A flexible pavement is to be evaluated according to the AASHTO 1972 design guide. The existing pavement has a weighted structural number=3.4, a regional factor=2.0, and a soil support value=4.5. What would be the approximated number of daily equivalent 18-kip axles to be allowed on this road for a 20-year analysis period?a. 10b. 33c. 100d. 1490arrow_forwardUsing the AASHTO rigid design procedure, design a pavement for a provincial road with an expected design ESAL of 20 x 106. The pavement structure is to consist of Portland cement concrete with an elastic modulus of 5.0 x 106 psi and a modulus of rupture of 550 psi, and a 12 in. thick unbounded granular material as subbase. The pavement is to be plain jointed and jointed reinforced concrete with tied P.C.C. shoulder and having load transfer devices. The climate consists of a wet season (November-April) and a dry season (May-October). Freezing of the subbase and subgrade is considered negligible. The elastic modulus of the subbase is 20,000 psi during the dry season and 15,000 psi during the wet season. The elastic modulus of the subgrade is 6,000 psi during the dry season and 3,500 psi during the wet season. The subgrade depth to the bedrock is 5ft. It is estimated that it will take a day for water to drain from the pavement and that the pavement will be saturated about 20 percent of…arrow_forward
- 2. You are asked to design a new flexible pavement structure for an existing road that will be totally replaced. You are provided with the following borehole results: a) Existing (Old) HMA - 135 mm b) Existing (Old) Granular A Base - 170 mm c) Existing (Old) Granular B Subbase - 340 mm d) Gravelly Silty Sand (Till) Subgrade (25 % 5-75 um) What is the current GBE for the existing pavement structure? What is the GBE for the same pavement structure when it was newly constructed?arrow_forwardA flexible pavement is designed to last 10 years to withstand truck traffic that consists only of trucks with two 18-kip single axles. The pavement is designed for a soil CBR of 10, an initial PSI of 5.0, a TSI of 2.5, an overall standard deviation of 0.40 and a reliability of 90%, and the structural number was determined to be 6. On one section of this roadway, beneath an underpass, an engineer uses an 8-inch rigid pavement in an attempt to have it last longer before resurfacing. How many years will this rigid-pavement section last? (Given the same traffic conditions, modulus of rupture = 800 lb/in2, modulus of elasticity = 5,000,000 lb/in2, load transfer coefficient of 3.0 and drainage coefficient of 1.0.).arrow_forwardA flexible pavement is designed to last 10 years to withstand truck traffic that consists only of trucks with two 18-kip single axles. The pavement is designed for a soil CBR of 10, an initial PSI of 5.0, a TSI of 2.5, an overall standard deviation of 0.40 and a reliability of 90%, and the structural number was determined to be 6. Determine the number of daily trucks traveling in the peak direction.arrow_forward
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