PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 4, Problem 24P
To determine
The thickness of the slab of the rigid pavement.
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A rigid pavement is on a highway with two lanesin one direction, and the pavement is conservativelydesigned. The pavement has an 11-inch slab with amodulus of elasticity of 5,000,000 lb/in2 and a concretemodulus of rupture of 700 lb/in2, and it is on a soil witha CBR of 25. The design drainage coefficient is 1.0, theoverall standard deviation is 0.3, and the load transfercoefficient is 3.0. The pavement was designed to last 20years (initial PSI of 4.7 and a final PSI of 2.5) with 95%reliability carrying trucks with one 18-kip single axleand one 28-kip tandem axle. However, after thepavement was designed, one more lane was added in thedesign direction (conservative design still used), and theweight limits on the trucks were increased to a 20-kipsingle and a 34-kip tandem axle (the slab thickness wasunchanged from the original two-lane design withlighter trucks). If El Niño has caused the drainagecoefficient to drop to 0.8, how long will the pavementlast with the new loading and the…
Using the AASHTO rigid design procedure, design a pavement for a provincial road with an expected design ESAL of 20 x 106. The pavement structure is to consist of Portland cement concrete with an elastic modulus
of 5.0 x 106 psi and a modulus of rupture of 550 psi, and a 12 in. thick unbounded granular material as subbase. The pavement is to be plain jointed and jointed reinforced concrete with tied P.C.C. shoulder and having
load transfer devices. The climate consists of a wet season (November-April) and a dry season (May-October). Freezing of the subbase and subgrade is considered negligible. The elastic modulus of the subbase is 20,000
psi during the dry season and 15,000 psi during the wet season. The elastic modulus of the subgrade is 6,000 psi during the dry season and 3,500 psi during the wet season. The subgrade depth to the bedrock is 5ft. It
is estimated that it will take a day for water to drain from the pavement and that the pavement will be saturated about 20 percent of…
A flexible pavement is designed to last 10 years to withstand truck traffic that consists only of trucks with two 18-kip single axles. The pavement is designed for a soil CBR of 10, an initial PSI of 5.0, a TSI of 2.5, an overall standard deviation of 0.40 and a reliability of 90%, and the structural number was determined to be 6. On one section of this roadway, beneath an underpass, an engineer uses an 8-inch rigid pavement in an attempt to have it last longer before resurfacing. How many years will this rigid-pavement section last? (Given the same traffic conditions, modulus of rupture = 800 lb/in2, modulus of elasticity = 5,000,000 lb/in2, load transfer coefficient of 3.0 and drainage coefficient of 1.0.).
Chapter 4 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
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
Ch. 4 - Prob. 11PCh. 4 - Prob. 12PCh. 4 - Prob. 13PCh. 4 - Prob. 14PCh. 4 - Prob. 15PCh. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - Prob. 18PCh. 4 - Prob. 19PCh. 4 - Prob. 20PCh. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - Prob. 24PCh. 4 - Prob. 25PCh. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Prob. 31PCh. 4 - Prob. 32P
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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,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_forwardQ2) 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_forward
- 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.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_forward4.13) 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.arrow_forward
- (b) The presence of water in cracks and transverse joint in rigid pavement causes a part of build-up of loose material under the cross-traffic load on approach and leave slabs. Based on the statements, with a suitable diagram, propose and explain how to reduce this phenomenon.arrow_forwardQ2-a) Design a flexible pavement for average traffic of 1000 vehicles exceeding 3 tons loaded weight. The CBR of sub-grade is 4.0. The compacted sub-base of the poorly graded gravel layer has a CBR of 20. The base material has a CBR of 60. The pavement will have a bituminous surfacing. Sketch the cross-section of the designed pavement mentioning the thickness of each layer.arrow_forwardA flexible pavement is designed to last 10 years to withstand truck traffic that consists only of trucks with two 18-kip single axles. The pavement is designed for a soil CBR of 10, an initial PSI of 5.0, a TSI of 2.5, an overall standard deviation of 0.40 and a reliability of 90%, and the structural number was determined to be 6. Determine the number of daily trucks traveling in the peak direction.arrow_forward
- A flexible pavement has a structural number of 3.8(all drainage coefficients are equal to 1.0). The initialPSI is 4.7 and the terminal serviceability is 2.5. The soilhas a CBR of 9. The overall standard deviation is 0.40and the reliability is 95%. The pavement is currentlydesigned for 1800 equivalent 18-kip single-axle loadsper day. If the number of 18-kip single-axle loads wereto increase by 30%, by how many years would thepavement’s design life be reduced?arrow_forward2- Describe six of the main differences between rigid and flexible pavements.arrow_forwardA concrete pavement has 7-in (203 mm) thich, A dowel diameter is: Select one: a. 5/8 in b. 1 in c. 7/8 in d. 3/4 inarrow_forward
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