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 2P
To determine
The number of
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B. A rigid pavement with a 10-inch slab thickness, 90 percent reliability, E. = 4 million
Ib/in?, 600 lb/in? modulus of rupture, 150 lb/in³ modulus of subgrade reaction, a 2.8 load
transfer coefficient, initial PSI of 4.8, final PSI of 2.5, overall standard deviation of 0.35,
and a drainage coefficient of 0.8 is designed. The pavement's design life is 20 years.
The three-lane road is built for vehicles with one 20,000-pound single axle, one
26,000-pound tandem axle, and one 34,000-pound triple axle. Calculate the projected
daily truck traffic on the three lanes
A flexible pavement is to be designed to last 10 years. The initial PSI is 4.2 and the TSI (the
final PSI) is determined to be 2.5. The subgrade has a soil resilient modulus of 15,000 lb/in².
Reliability is 95% with an overall standard deviation of 0.35. For design, the daily car,
pickup truck and light van traffic is 40,000 and the daily truck traffic consists of 1500 passes
of single-unit trucks with two single axles and 325 passes of tractor semi-trailer trucks with
single, tandem, and triple axles. The axle weights are:
Cars, pickups, light vans = two 2 kip single axles
Single-unit truck = 8 kip single axle and 24 kip single axle
Tractor semi-trailer truck = 10 kip single axle, 18 kip tandem axle, and 42 kip triple
axle.
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M₂ and M3 are equal to 1 for the materials in the pavement structure. Four inches of hot-
mix asphalt (HMA) is to be used as the wearing surface and 10 inches of crushed stone as
the subbase. Determine the thickness required for the base if soil cement is the…
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. Determine the number of daily trucks traveling in the peak direction.
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 is constructed with 3 inches of hot-mix asphalt (HMA) wearing surface, 6 inches of emulsion/aggregate-bituminous base, and 6 inches of crushed stone subbase. The subgrade has a soil resilient modulus of 8,000 lb/in² , and M2 and M3 are equal to 1.0 for the materials in the pavement structure. The overall standard deviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kip single axles, 400 24-kip single axles, and 680 40-kip tandem axles. How many years would you estimate this pavement would last (how long before its PSI drops below a TSI of 2.5) if you wanted to be 90% confident that your estimate was not too high, and if you wanted to be 99% confident that your estimate was not too high?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 necessary.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_forward
- A rigid pavement is designed with an 11-inch slab thickness, 90% Rellability (ZR = -1.282), Es = 4 million psi, modulus of rupture of 600 psi, modulus of subgrade reaction of 150 lb/in?, a 2.8 load transfer coefficient, initial PSI = 4.8, final PSI of 2.5, overall standard deviation of 0.35, and a drainage coefficient of 0.80. The pavement has a 20-year design life. The pavement has three lanes in one direction (PDL = 0.80) and is conservatively designed for trucks that have one 20,000-lb single axle load (1.58), one 26,000-lb tandem axle (0.619), and one 34,000-b triple axle (0.593). What is the daily estimated truck traffic on the three lanes? logia (APSI) S,C¢(D@7% – 1.132) 3.0 [1.62410x10 |(D + 1)*46 | log10 (W) = Zg5, + 7.35 (log,0( D + 1)) – 0.06 +: +(4.22 - 0.327SI) log10 1+ 18.42 215.63/ De75 - 0.25arrow_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. 150,814 B 75,407 C) 37,704 18,852arrow_forwardA flexible pavement is constructed with 4 inches of hot-mix asphalt (HMA) wearing surface, 8 inches of emulsion/aggregate-bituminous base, and 8 inches of crushed stone subbase. The subgrade has a soil resilient modulus of 10,000 lb/in^2, and M2 and M3 are equal to 1.0 for the materials in the pavement structure. The overall standard deviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kip single axles,400 24-kip single axles, and 680 40-kip tandem axles. How many years would you estimate this pavement would last (how long before its PSI drops below a TSI of 2.5) if you wanted to be 99%confident that your estimate was not too higharrow_forward
- A 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_forwardA rigid pavement is designed with a 11-inch slab, an E_c of 6 million Ib/in^2, a concrete modulus of rupture of 432 Ib/in^2, a load transfer coefficient of 3.0, an initial PSI of 4.50, and a TSI of 2.5. The overall standard deviation is 0.56, the modulus of subgrade reaction is 190 Ib/in^3, and a reliability of 90% is used along with a drainage coefficient of 0.87. The pavement is designed assuming that traffic is composed entirely of trucks (50 per day). Each truck has one 20-kip single axle and one 42-kip tandem axle (the effect of all other vehicles is ignored). A section of this road is to be replaced (due to different subgrade characteristics) with a flexible pavement having a SN of 5 and is expected to last the same number of years as the rigid pavement. What is the assumed soil resilient modulus? (Assume that all other factors are the same as for the rigid pavement). Please report your answer as a decimal in units of Ib/in^2. For example, report 3000.6 Ib/in^2 as 3000.6.arrow_forwardQ2-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.arrow_forward
- A flexible pavement has a 210 mm hot-mix asphalt “HMA” wearing surface, a 300 mm base (MG-20), and a 500 mm subbase (MG-112). The pavement was designed with 95% reliability, an overall standard deviation So of 0.45, and a APSI of 1.75 (a TSI of 2.5). The drainage coefficient is 0.8 for the base and subbase. The materials properties are as follows: - = Resilient modulus of HMA 2 894 MPa (or 420 000 psi); Resilient modulus of base (MG-20) = 169 MPa (or 24 500 psi); Resilient modulus of subbase (MG-112) = 74 MPa (or 10 700 psi); Effective roadbed soil resilient modulus = 36 MPa (or 5 200 psi). How many 18-kip (80-KN) single-axle loads can be carried before the pavement reaches its TSI (terminal serviceability index).arrow_forwardA flexible pavement has a structural number of 3.8 (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 design life be reduced?arrow_forward4.6 A flexible pavement has a structural number of 3.8 (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?arrow_forward
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