Solve on paper. There is a typo in the question, the passenger cars should have 2000 lb (2-Kip) axles. 1-581 is being continued eastbound in Roanoke. The existing freeway consists of two lanes in each direction of flexible pavement with a structuralnumber of 5 and a subgrade CBR of 6. If the pavement is conservatively designed, how many years longer will the pavement last if a third lane is addedgiven the following conditions for the updated design?•An overall standard deviation of 0.35 and reliability of 90%.• Initial design PSI of 4.6, with the final PSI of 2.5.Anticipated design traffic is:•23,000 vehicles per day, where the design passenger car has two 2,000-lb single axles.• 3,000 trucks per day, where the design truck has a 12,000-lb single axle and two 32,000-lb tandem axles.

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Answered: 1-581 is being continued eastbound in…

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter19: Design Of Flexible Highway Pavements

Section: Chapter Questions

Problem 11P

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▪ 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?
A 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.
Q1: 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 7×106. 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.
section of a two-lane rural highway is to be realigned and replaced by a four-lane highway with a full-depth asphalt pavement. Consists of 40% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1000. It is expected that construction will be completed five years from now, and pi =4.5 and pt = 2.5. Growth rate = 4%. Design life = 20 years. The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 (Mr=30000 lb/in2 ) and 22 (Mr=13500 lb/in2 ), respectively, and Mr for the asphalt mixture, 400,000 lb/in2 .
Please help assume any missing data.
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.).
on paper solution and work
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.
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?
Road engineering
a segment of freeway consists of two upgrades of 2%, 800 m long and 3% 600 m long. Determine the PCE trucks/buses and recreational vehicles on this composite upgrade if 6% of vehicles are truck and 10% are recreational vehicles. Determine the number of lanes required for a freeway section if the section is to operate at LOS C. The input parameters include: One Cloverleaf interchange per mile (ramp density = 4 ramps/mile or 2.5 ramps/km) lane width = 12 fr (3.6m) right-side lateral clearance = 6years (1.8m) traffic composition: 10% trucks, 2% RVs V = 3000 veg/h Number of lanes: Must be greater than or equal to 2 Pero direction PHF = 0.95 Analysis segment is (0.35 miles (0.56km)) long with 4.5 % grade

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