PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 4, Problem 25P
To determine
The reliability of the pavement to last
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Q2-a) Design a flexible pavement for average traffic of 1000 vehicles exceeding 3 tons loaded weight.
The CBR of sub-grade is 4.0. The compacted sub-base of the poorly graded gravel layer has a
CBR of 20. The base material has a CBR of 60. The pavement will have a bituminous surfacing.
Sketch the cross-section of the designed pavement mentioning the thickness of each layer.
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)
A flexible pavement was designed for the following daily traffic with a 12-year design life. The highway was designed with
4" of hot-mix wearing surface (0.44); 4" of hot-mix asphaltic base (0.40), and 8" of crushed stone base (0.11). Reliability
was 70% (-0.524), overall standard deviation was 0.50. APSI = 2.0 (with TSI of 2.5), all drainage coefficients were 1.0.
What was the CBR used in the design?
1300 passes single axdes at 8,000 lb each (0.03925)
900 passes tandem axles at 15,000 |b each (0.0431)
20 passes single axles at 40,000 lb, each (22.164)
200 passes tandem axles at 40,000 Ik each (2.0242)
(APSI
log10(W13) = Z,S, + 9.36 ( log10( SN + 1)) – 0.20 +
0.40 +
logia 2.7
1094
[(SN + 1)15
+ 2.32 log10(Ma)l- 8.07
Chapter 4 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
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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- A 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_forwardA flexible pavement is designed with 4 inches of sand-mix asphalt wearing surface, 6 inches of dense-graded crushed stone base, and 8 inches of crushed stone subbase. All drainage coefficients are 1.0. The initial PSI is 4.5, the TSI is 2.5, the soil resilient modulus is 12,000 lb/in², reliability is 90%, the overall standard deviation is 0.4, and the design life is 15 years. A design mistake was made that ignored 100 daily passes of trucks with 22-kip single and 30-kip tandem axles. What crushed stone subbase thickness should have been used? [Do not interpolate the axle equivalency factors, use the closest values]arrow_forwardQ/ A 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, APSI 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_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_forwardQ2: A pavement system must be designed to accommodate 1,000 20-kip single axle loads per day. The pavement should provide 99% reliability and accommodate a standard devation of 0.35. The pavement should be comprised of either a 10-inch concrete slab or a 6-inch hot-mix asphalt surface on top of a 7-inch dense-grade crushed stone base and a 10-inch crushed stone subbase. Determine whether the rigid or flexible pavement will lost longer given the following pavement and soil characteristics: • PSI = 4.5 (both pavements) • TSI = 2.5 (both pavements) • CD = 1.0 • E = 4,000,000 • k= 300 pci • J= 3.0 • M2 = M3 = 1.0 • MR = 12,500 psi • S' = 1,000 psi Use the AASHTO pavement design equations or nomograph.arrow_forwardA flexible pavement is constructed with 5 inches of sand-mix asphaltic wearing surface (a = 0.35), 9 inches of dense-graded crushed stone base (a = 0.18), and 10 inches of crushed stone subbase (a = 0.11). The base has a drainage coefficient of 0.90 while the subbase drainage coefficient is 1.0. Determine the structural number of the pavement.arrow_forward
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