PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 4, Problem 26P
To determine
The reliability of the pavement to have a PSI above
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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?
(b)
The presence of water in cracks and transverse joint in rigid pavement causes
a part of build-up of loose material under the cross-traffic load on approach
and leave slabs. Based on the statements, with a suitable diagram, propose
and explain how to reduce this phenomenon.
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.).
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 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 lb/in2, 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?arrow_forwardA thin sealed unbound granular pavement is comprised of a 300mm CBR-60 Base sitting on a 300mm CBR-10 Sub-base sitting on a CBR-4 subgrade. Estimate the maximum design traffic – DESA for this pavement. Draw the possible pavement layer thickness arrangements.arrow_forwardTraffic loading, material characteristics and environmental conditions, are among the factors that influence pavement performance. Environmental conditions can have a particularly significant impact on the performance of low-volume road pavements. Discuss how environment conditions can effect at Cameron Highland road.arrow_forward
- 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_forwardDetermine the total thickness of flexible pavement (in mm) for a two Lane undivided carriageway using the following data:arrow_forwardQuestion 21 Calculate the design thickness in mm (rounded to the nearest tens) at the center of a rigid pavement with dowels if the: Allowable tensile strength of concrete = 3.0 MPa Wheel load = 117 kN • Question 22 A vehicle encounters a sag parabolic curve on a night travel. The stationing at the vehicle at the point of study was 1349+998 meters and the stationing at the end of the curve is 1350+103. If the sight distance following standard design values is 114 meters, what is the value of the change of grade A in %?arrow_forward
- ▪ A roadway is determined to have 400 18-kip single axles, 200 24-kip single axles, and 100 40- kip tandem axles per day. The subgrade CBR is 10 and the roadway pavement is designed for an overall standard deviation of 0.45, a reliability 99.9% and the initial PSI is 4.5 and the TSI is 2.5. One newly constructed section of this roadway is a rigid pavement designed with a 10- inch slab with a modulus of rupture of 900lb/in², and a modulus of elasticity of 4.5x10 lb/ in², and a joint transfer coefficient of 3.2. Another newly constructed section of the same roadway is a flexible pavement with a 4-in sand-mix asphaltic concrete surface, 9-in dense- graded crushed stone base and a 9-in crushed-stone subbase. If the roadway has three lanes in each direction and is conservatively designed, which of the pavement sections will last longer and by how many years if all drainage coefficients are 1.0?arrow_forwardA 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- 8.07arrow_forwardQ1: Design the pavement for an expressway consisting of an asphalt concrete surface, a crushed stone base, and a granular subbase using the 1993 AASHTO design method. The cumulative ESAL in the design lane for a design period of 15 years is 7x106. The area has good quality drainage with 10% of the time the moisture level is approaching saturation. The effective roadbed soil resilient modulus is 7 ksi, the subbase has a CBR value of 80, the resilient modulus of the base is 40×103 psi, and the resilient modulus of asphalt concrete is 4.5×105 psi. Assume a reliability level of 95%, So of 0.45, po = 4.6, and pt = 3.0.arrow_forward
- Q3: Evaluate whether Sin of slab thickness for rigid pavement will be adequate on a rural expressway for 20-year analysis period if design criteria are as follows: (30 Marks) Pi = 4.5, Pi=2.5, ESAL over design period = 10* 10, Concrete Elastic modulus, E, 6.5*10 Ib/in', Mean Concrete modulus of Rupture 800 Ib/in', Drainage Coefficient C= 1.0, R=0.95, S. = 0.3, K = 100 Ib/in', Load transfer coefficient 3.2arrow_forwardA flexible pavement has a structural number of 3.8(all drainage coefficients are equal to 1.0). The initialPSI is 4.7 and the terminal serviceability is 2.5. The soilhas a CBR of 9. The overall standard deviation is 0.40and the reliability is 95%. The pavement is currentlydesigned for 1800 equivalent 18-kip single-axle loadsper day. If the number of 18-kip single-axle loads wereto increase by 30%, by how many years would thepavement’s design life be reduced?arrow_forwardA rigid pavement is being designed with the same parameters as used in Problem 4.5. The modulus of subgrade reaction is 300 lb/in? and the slab thickness is determined to be 8.5 inches. The load transfer coefficient is 3.0, the drainage coefficient is 1.0, and the modulus of elasticity is 4 million 1b/in?. What is the design modulus of rupture? (Assume that any parameters not given in this problem are the same as those given in Problem 4.5.) 4.5 for reference: A flexible pavement was designed for the following daily traffic with a 12-year design life: 1300 single axles at 8000 Ib each, 900 tandem axles at 15,000 1b each, 20 single axles at 40,000 Ib each, and200 tandem axles at 40,000 lb each. The highway was designed with 4 inches of HMA wearing surface,arrow_forward
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