A flexible pavement is constructed with 4 in. (10.16 cm) of hot mix asphalt wearing surface, 8 in. (20.32 cm) of emulsion/aggregate- bituminous base, and 8 in. (20.32 cm) of crushed stone subbase. The subgrade has a soil resilient modulus of 10,000 psi (68.95 MPa), 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 (89.0-kN) single axles, 400 24-kip (106.8-kN) single axles, and 680 40-kip (177.9-kN) tandem axles. How many years would you estimate this pavement would last (i.e., 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, and if you wanted to be 95% confident that your estimate was not too high? Use the editor to format your answer

A flexible pavement is constructed with 4 in. (10.16 cm) of hot mix asphalt wearing surface, 8 in. (20.32 cm) of emulsion/aggregate- bituminous base, and 8 in. (20.32 cm) of crushed stone subbase. The subgrade has a soil resilient modulus of 10,000 psi (68.95 MPa), 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 (89.0-kN) single axles, 400 24-kip (106.8-kN) single axles, and 680 40-kip (177.9-kN) tandem axles. How many years would you estimate this pavement would last (i.e., 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, and if you wanted to be 95% confident that your estimate was not too high? Use the editor to format your answer

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Problem No. 1A flexible pavement for an urban interstate highway is to be designed using the AASHTOmethod to carry a design ESAL of 3 x 106. It is estimated that it takes about a week for water tobe drained from within the pavement and the pavement structure will be exposed to moisturelevels approaching saturation for 30% of the time. The following additional information is available: Elastic modulus of asphalt concrete = 450,000 psiResilient modulus of base material = 35,000 psiResilient modulus of subbase material = 15,000 psiCBR of subgrade material = 8(a) Consider designing the same pavement with only asphalt concrete and base layer (excluding subbase layer). Use the information provided in Problem 1. (b) Compare strengths and weaknesses of each design.
3. a) What is meant by dowel bar? Why it is used in the rigid pavement? b) Design the Dowel Bars for the following parameters: i) Design wheel load = 5100 kg ii) Design load transfer 40% iii) Slab thickness 30 cm iv) Joint width = 2.0 cm v) Modulus of dowel support = 42000 kg/em3 vi) Modulus of elasticity of dowel bar = 2x106 kg/cm2 vii) Modulus of subgrade reaction = 8 %3D viii) Grade of concrete = M 50
As a materials engineer working for a highway department, what standard PG asphalt binder grade would you specify for each of the conditions shown in the table below. Show all calculations.
1. During the AASHO road test, ONLY flexible pavements were constructed and tested.a. Trueb. False2. The AASHO present serviceability rating (PSR) was considered an objective quantity used to establish the performance of highway pavement in terms of applied traffic.a. Trueb. False3. The AASHTO present serviceability index (PSI) correlates the PSR to actual pavement performance in terms of applied traffic, and select distresses.a. Trueb. False4. There is only one AASHTO PSI equation that applies to both flexible and rigid pavements.a. Trueb. False5. The AASHTO PSI scale ranges from:a. 0-5b. 0-10c. 0-100d. None of the above
What is the primary component of a bituminous pavement? A) Cement B) Lime C) Bitumen D) Gypsum
Enumerate the desirable and define the desirable properties of sand and aggregate as pavement materials.
The elastic modulus of mid-range aggregate asphalt pavement is 480 MPa while its subgrade has an elastic modulus of 55 MPa. What is the stiffness factor of the flexible pavement? 0.12 0.61 0.34 0.49
Please show all of your work and give the correct answer.
Please kindly answer both.. please give me both answers
A pavement which has negligible flexural strength is called: A none of the above B) concrete flexible D rigid
Q#1 What is the primary function of the pavement structure? Why do we use high quality materials as we go from bottom to top of the pavement structure? Discuss various tests used for the quality of bitumen used in flexible pavements. Discuss various tests used for the quality of aggregate used in flexible pavements.
Subject : Transportation Engineering Give me both a and b right solutions A 5 tonne wheel load is applied on a pavement and generates a surface deflection of 0.15 mm. (a) If the equivalent radius of tyre contact is 100 mm and Poisson’s ratio is 0.3, what is the pavement’s modulus of elasticity? (b) If the pavement is 125 mm thick, what is the vertical stress at the top of the subgrade?