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 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.
Q/ A flexible pavement is designed with 5 inches of hot-mix asphalt (HMA) wearing
surface, 6 inches of hot-mix asphaltic base, and 10 inches of crushed stone subbase.
All drainage coefficients are 1.0. Daily traffic is 200 passes of a 20-kip single axle,
200 passes of a 40- kip tandem axle, and 80 passes of a 22-kip single axle. If the
initial minus the terminal PSI is 2.0 (the TSI is 2.5), the soil resilient modulus is
3000 Ib/in, and the overall standard deviation is 0.6, what is the probability
(reliability) that this pavement will last 20 years before reaching its terminal
serviceability?
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
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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- 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_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_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_forward
- Q2: 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 has a SN of 4 (all drainage coefficients are equal to 1.0). The initial PSI is 4.7 and the terminal serviceability is 2.5. The soil has a CBR of 9. The overall standard deviation is 0.40 and the reliability is 95%. The pavement is currently designed for 1800 equivalent 18-kip single-axle loads per day. If the number of 18-kip single-axle loads were to increase by 30%, by how many years would the pavement's design life be reduced? For SN, please round-off to the nearest whole number if necessaryarrow_forwardPlease help with this question Thanksarrow_forward
- A 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 was initially designed with 2 inches of sand-mix asphaltic wearing surface, 9 inches of dense-graded crushed stone base, 8 inches of crushed stone subbase. The base has a drainage coefficient of 0.90, while the subbase drainage coefficient is 1.0. If pavement is designed for 54-kip tandem axles vehicles, by how much daily traffic can be increased if wearing layer will be increased by 3 inches. State your answer in % in a form 00.00%. Round SN value to the nearest integer.arrow_forwardNonearrow_forward
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