Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 4, Problem 16P
To determine
The durability of the pavement if the reliability is
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A 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,
4.13) A rigid pavement is being designed with the same parameters as used in Problem 4.5. The modulus of subgrade reaction is 300 1b/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 Ib/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 has been added for reference.
Subject : Transportation Engineering
Read the question carefully and give me right solution according to the question.
Note: solve by using 45-deg cone pressure distribution method only
The maximum wheel load that the pavement could carry is 120 kN. If the contact radius of the wheel is assumed to be 250 mm, and subgrade bearing capacity is equivalent to 0.24 Megapascals, calculate the subgrade layer thickness of the flexible pavement in mm using the 45-deg cone pressure distribution method.
Chapter 4 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
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
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- Problem 31: Compute the pavement thickness by expansion pressure method if the expansion pressure is 0.160 kg/cm? and the average pavement density is 0.0030 kg/cm?.arrow_forwardDetermine the safe thickness of rigid pavement if the wheel load is 85 kN and f'c=32 MPa.arrow_forwardProblem 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_forward
- Q2) A wheel load with circular area has a radius 6 in. and uniform pressure 552 kPa is applied on a two-layer system, consists of asphalt layer has an elastic modulus of 350000 psi and stabilized subgrade has elastic modulus 70000 psi. The subgrade can support a maximum vertical stress allowing for allowable number of stress repetitions of 2.5 x 109 before occurring of permanent deformation. Calculate the required thickness of a full-depth pavement, deflection in pavement and the critical tensile strain at the bottom of asphalt layer.arrow_forwardA rigid pavement is used with a modulus of subgrade reaction of 200 lb/in3, a slab thickness of 8 inches, a load transfer coefficient of 3.2, a modulus of elasticity of 5 million lb/in2, a modulus of rupture of 600 lb/in2, a reliability of 85%,a standard deviation of 0.30, PSI = 2.2(TSI=2.5),and a drainage coefficient of 1.0. How many years would the pavement be expected to last based on the following traffic data?arrow_forwardA rigid pavement is to be used to carry a wheel load of 53.5 kN. Design the thickness at the edge and at the center of the pavement. The allowable tensile stress of concrete is 1.38 MPa. Sufficient dowels are used across the joints.arrow_forward
- 6.1 A set of dual tires is spaced at 34 in. center to center and carries a total load of 45,000 lb with a tire pressure of 100 psi. Assuming the pavement to be a homogeneous half-space, determine the ESWL for a pavement of 25 in. using (a) the Boyd and Foster method, (b) the Foster and Ahlvin method, and (c) Huang's chart based on equal contact radius. [Answer: 32,200 lb, 32,800 lb, 32,800 lb]arrow_forwardCompare flexible and rigid pavement construction for a new highway.arrow_forwardDesign the thickness of a pavement to carry a wheel load of 52kN based on the following conditions and type of pavement. A rigid pavement with an allowable tensile stress of concrete is 1.8 MPa. Neglect effect of dowels. Use Olders Theory. Assume sufficient dowels are used across the joints. Used Olders Theory. A flexible pavement with an allowable subgrade pressure of 0.14MPa and the max. tire pressure equal to 0.52MPa. This pressure is assumed to be uniformly distributed over the area of tire contact on the roadway according to the principle of cone pressure distribution. A pavement with maximum CBR value of 8% for the subgrade soil supporting this load. The tire pressure is equal to 4kg/cm².Use U.S. Corps of Engineers Formula.arrow_forward
- Compute the modulus of elasticity of the pavement if the modulus of elasticity of the subgrade is90 MPa with a stiffness factor of 0.55arrow_forwardWrite the significance of each layer of flexible pavement in a single line. B) Describe the one most important factor of causing failure of highway subgradearrow_forwardA flexible pavement carries a static wheel load of 53.5kN. The circular contact area of the tire is 85806 square mm and the transmitted load is distributed across a wide area of the subgrade at an angle of 45 degrees. The subgrade bearing value is 0.14MPA, while that of the base is 0.41Mpa. Design the thickness of pavement and that of the base. answer should be in mm. Identity first the thickness of the pavement next the thickness of the base.arrow_forward
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