A flexible pavement is constructed with 5 inches of hot mix asphalt wearing surface (material coefficient = 0.4), 10 inches of granular base (material coefficient 0.11 and resilient modulus = 22,500 psi), and 12 inches of granular subbase (material coefficient = 0.09 and resilient modulus = 12,500 psi). The subgrade has a resilient modulus of 5,000 psi. The drainage coefficients are 0.9 and 0.8 for the base and subbase, respectively. The reliability factor is 90%, the overall standard deviation is 0.45, Pi = 4.5 and P: = 2.5. Determine the maximum 18,000 lb ESAL applications that can be carried safely by this pavement structure. %3D %3D %3D

A flexible pavement is constructed with 5 inches of hot mix asphalt wearing surface (material coefficient = 0.4), 10 inches of granular base (material coefficient 0.11 and resilient modulus = 22,500 psi), and 12 inches of granular subbase (material coefficient = 0.09 and resilient modulus = 12,500 psi). The subgrade has a resilient modulus of 5,000 psi. The drainage coefficients are 0.9 and 0.8 for the base and subbase, respectively. The reliability factor is 90%, the overall standard deviation is 0.45, Pi = 4.5 and P: = 2.5. Determine the maximum 18,000 lb ESAL applications that can be carried safely by this pavement structure. %3D %3D %3D

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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Concept explainers

Design of pavements

Pavement is a structure that is made up of different layers such as sub-base course layer, base course layer, binder course, and a surface course formed with different materials such as gravel, above the subgrade soil constructed to act as a path or carriageway enabling the movement of vehicles. The surface of the pavement should possess characteristics such as adequate friction, light reflection, and drainage. The pavements are classified based on structural design into rigid pavements, flexible pavements, composite pavements, and unpaved pavements. The process of determining a suitable pavement type, its constituent layers, and its thickness is called pavement design.

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Q2
A flexible pavement is constructed with 5 inches of hot mix asphalt wearing surface (material
coefficient = 0.4), 10 inches of granular base (material coefficient = 0.11 and resilient modulus =
22,500 psi), and 12 inches of granular subbase (material coefficient = 0.09 and resilient modulus
= 12,500 psi). The subgrade has a resilient modulus of 5,000 psi. The drainage coefficients are 0.9
and 0.8 for the base and subbase, respectively. The reliability factor is 90%, the overall standard
deviation is 0.45, P; = 4.5 and P = 2.5. Determine the maximum 18,000 lb ESAL applications that
can be carried safely by this pavement structure.

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A flexible pavement is constructed with 3 inches of hot-mix asphalt (HMA) wearingsurface, 6 inches of emulsion/aggregate-bituminous base, and 6 inches of crushedstone subbase. The subgrade has a soil resilient modulus of 8,000 lb/in2 , and M2 andM3 are equal to 1.0 for the materials in the pavement structure. The overall standarddeviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kipsingle axles, 400 24-kip single axles, and 680 40-kip tandem axles. How many yearswould you estimate this pavement would last (how long before its PSI drops below aTSI 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?
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Flexible Pavement Design Assume the thickness of Base Course and Sub Base Course. Compute the SN of Asphalt, Asphalt treated Base, Base course, and Sub base course. Compute the thickness of Asphalt and Asphalt Treated Base.
A 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 high
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4- Describe the characteristics and functions of the top layer in a pavement system.
Need asap really need it thank you
A 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.
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