Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 19, Problem 18P
To determine
The expected rut depth of the fourth layer.
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[2] A pavement structure composed of the following three layers: (5.75 in)
HMA with elastic modulus 400,000 psi, (23 in) granular base with elastic
modulus 20,000 psi, and a subgrade with elastic modulus 10,000 psi. All
layers are assumed to have a Poisson ratio of 0.5. Calculate the maximum
horizontal tensile strain at the bottom of HMA and the maximum vertical
compressive strain on the top of subgrade under a 40,000-lb wheel load and
150-psi contact pressure.
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- Q3/Choose the correct answer 1. In general PSI for flexible pavement depend on............ Va. Cracking, Patching and Rutting b. Cracking and Patching c. Patching and Rutting d. Rutting 2. The Maximum contraction joint spacing for plain jointed concrete pavement is C. 3.5 m b. 4.5 m c. 5.5 m d. Depends on traffic load 3. The relationship between A psi and age of pavement is...... a. A psi co age Apsi ∞ (1/age) c. A psi 02(1/age) d. Non of the above 4. The surface of the pavement should be a. Smooth b. Rough 5. Which type of aggregates gives good workability? a. Round b. Flaky c. Angular 6. Rutting may be avoided by a. Good compaction . Sufficient enough to resist skid b. Good drainage 7. Bleeding may be avoided by a. Water voids b. Air voids c. Asphalt type 12. Tie bars in cement concrete pavements are at a. Expansion joints d. All the above acceptable c. High filler percent All the above 8. The good drainage in pavement can La Increase the pavement life b. Decrease the pavement life…arrow_forward1. Figure (1) shows a pavement structure composed of three layers with their details. If the HMA and the base layers are combined into one layer with the same total thickness (HMA+base layers), what should be the equivalent elastic of the combined layer modulus so the tensile strain at the bottom of the the HMA= 0.0006 in. 30000 Ib 150 psi E, = ? 6 in HMA layer Ej = 400,000 psi V;=0.4 Granular base E = 20,000 psi V=0.4 20 in layer Subgrade layer E3 = 10,000 psi Vz=0.4 %3Darrow_forwardCorrect answer will upvotearrow_forward
- Determine the thickness of a rigid pavement with a wheel load capacity of 54 kN, if the allowable tensile stress of the concrete is 1.6 MPa. Neglect the effect of dowels.arrow_forwardCalculate the maximum stress at corner if 4600 kg wheel load is applied on cementconcrete pavement of thickness 180 mm. a) 40 kg/cm² b) 42.59 kg/cm² c) 43.54 kg/cm² d) 44.89 kg/cm²arrow_forwardA flexible pavement having a thickness of 46 mm carries a static wheel load of "W". The circular contact are of time has an equivalent radius of 150 mm. If the load "W" is assumed to be transmitted across a wide area of subgrade at an angle of 45°, compute the value of wheel load "W" if the bearing stress of the base is 0.42 MPa.arrow_forward
- 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).arrow_forwardThe spacing between the contraction joints of a CC pavement is 3.5 m. Determine the stress developed in the pavement (in kg/cm²) due to contraction if the coefficient of friction between the bottom of the pavement and the supporting layer is 1.05 and the unit weight of concrete is 2450 kg/m³.arrow_forward3. A flexible pavement having a thickness of 45mm carries a static wheel load W. The circular contact of the tire has an equivalent radius of 150mm. IF the load W is assumed to be transmitted across a wide area of subgrade at an angle of 45 degrees, compute the value of the wheel load if the bearing stress of the base is 0.40MPA.arrow_forward
- 5.(e) Design the pavement section by triaxial test method using the following data: Wheel load = 4100 kg Radius of contact area = 15 cm Traffic coefficient, X = 1.5 Rainfall coefficient Y = 0.9 Design deflection A = 0.25 cm E-value of subgrade soil E = 100 kg/cm² E-value of base course material E = 400 kg/cm² E-value of 7.5 cm thick bituminous concrete surface course = 1000 kg/cm2arrow_forwardQuestion number (26) Highway Engineering civil engineeringarrow_forwardThe following figure shows concrete pavement with the layer thickness and elastic modulus as indicated. Assume modulus of rupture of 650 psi, load transfer coefficient of 3.2, serviceability loss from 4.5 to 2.5, and drainage coefficient of 0.9. The bedrock depth and loss of support is not considered for the subgrade. Use the design equation or monograph with 50% reliability to solve the following: 1) Determine the number of ESAL that the pavement can carry before failure. 2) If the daily traffic has 1080 single axles (20-kip), 400 single axles (24-kip), and 680 tandem axles (40-kip), and the annul traffic is the same over the design period, how many years would the concrete pavement last before failure? 8-inch Portland Cement Concrete Ec=4×106 psi 8-inch Granular Subbase Ec=30,000 psi Subgrade Mr = 5000 psiarrow_forward
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