Cracked in the newly paved road may be assumed to occur according to a Poisson process with a mean rate of 0.05 meter per road. Suppose a typical roadwork 250 m long can only be accepted if the number of visible cracks is no more than 20. What is the probability that the roadwork will be acceptable

Cracked in the newly paved road may be assumed to occur according to a Poisson process with a mean rate of 0.05 meter per road. Suppose a typical roadwork 250 m long can only be accepted if the number of visible cracks is no more than 20. What is the probability that the roadwork will be acceptable

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter21: Pavement Management

Section: Chapter Questions

Problem 4P

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Highway engineering civil engineering Question number (33)
Public Works Department (PWD) received a complaint from the traffic user on the increasing number of pavement deformations such as potholes and crocodile cracks at Jalan Ayer Dalam, Petaling Jaya, Selangor. A site investigation conducted by the PWD revealed that at 5 cm below the center of the tire load, a deflection of 0.889 mm was detected due to a wheel carrying a 30 KN load. The contact radius is measured at 13 cm and the Poisson ratio is 0.5. In order to analyse the pavement's performance, you are requested to determine the pavement's modulus of elasticity.
A transportation agency is planning a pavement roughness data collection program to monitor statewide pavement performance. Assuming that 10 percent of change in roughness should be detectable at 95% confidence level, how many 1-mile pavement segments should be included in the annual condition survey? There are 20,000 center-line miles of pavement in total.
3. Determine the thickness of a rigid pavement (thickness of concrete slab) by using the data provided below: DATA PROVIDED: Table 1. 1. Cumulative 18kips ESAL = 5.000.000 Table Standard force-penetration Penetration Load relationship (CBR - 100) 2. Overall standard deviation = 0.3 (millimetres) (kN) Penetration Load 3. Reliability = 95% 0.5 1.6 3.3 (mm) (kN) 1.0 1.5 2.0 2.5 3.0 3.5 4. Design serviceability loose =1.7 4.9 11.5 6.6 17.6 22.2 26.3 30.3 33.5 5. Drainage coefficient = 1 8.2 6 9.3 10.5 11.4 6. Load transfer coefficient = 3.2 10 12 4.0 7. Mean concrete modulus of rupture - 650 psi 4.5 122 13.0 5.0 8. Elastic modulus of the concrete to be used = 5.000.000psi 9. Results of CBR test on subgrade material in the laboratory (Table 1): 10. Standard force-penetration data.
Question number (26) Highway Engineering civil engineering
tire with 700 kPa air pressure distributes a load over an area with a circular contact radius, a, of 130mm. The pavement was constructed with a material that has a modules of elasticity of 345000 kPa and a Poisson ratio of 0.45 and thickness of 30cm. Calculate the rudial-horizontal stress and deflection at a point the pavement surface under the center of the tire load. Also, calculate the radial-horizontal stress and deflection at a point at a depth of half pavement layer way from the centre of the tire load. (USE: Ahlvin and Ulery equations).
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A pavement element along Thika road of 100x150x200 mm was subjected to an equalall round pressure of 120kn/m2 and axial load of 2.5KN in the X-direction. The changesin length are 0.92mm in X-direction, 0.27mm in the Y-direction and 0.18mm in the Z direction. Calculate thei. Elastic theory ratio, Eii. Poisson’s ratio,iii. Bulk Modulus, K
Q. 4 a) Why should the effective structural capacity of an existing pavement earmarked for rehabilitation to extend its service life be evaluated? b) The following expression is associated with the use of the Falling Weight Deflectometer (FWD) on pavements earmarked for rehabilitation. 1.5pa d, = Mg MR %3D E, i. What is the structural transformation required to make the use of the above expression possible? Which parameters in the expression relate to the transformation? I1. Identify the parameters in the expression which are obtained from the FWD test and briefly III. describe how the setup of the test enables those parameters to be obtained. [You may use any relevant expression(s) or equation(s) to support your explanation.]
A tyre with 230 kPa air pressure distributes a load over an area with circular contact radius of 200 mm. The pavement was constructed with a material that has a modulus of elasticity of 450 MPa and a Poisson's ratio of 0.40. 1.1 Calculate the radial-horizontal stress and deflection at a point on the pavement surface under the center of the tyre load. [Function values table: A = 1 B = 0 C = 0 E = 0.5 H = 2 ] Wrong answer will be instantly downvoted, don't attempt if not sure .
A tyre with 230 kPa air pressure distributes a load over an area with circular contact radius of 200 mm. The pavement was constructed with a material that has a modulus of elasticity of 450 MPa and a Poisson's ratio of 0.40 Calculate the radial-horizontal stress and deflection at a point on the pavement surface under the center of the tyre load. [Function values table: A=1.0; B=0; C=0; F=0.5; H=2.0]
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