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 31P
To determine
The durability of the pavement if the reliability is
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A rigid pavement on a new interstate (3 lanes each direction) has been conservatively designed with a 12- inch slab, an Ec of 5.5 x 106 lb/in2 , a concrete modulus of rupture of 700 lb/in2 , a load transfer coefficient of 3.0, an initial present serviceability index of 4.5, and a terminal serviceability index of 2.5. The overall standard deviation is 0.35, the subgrade CBR is 25, and the drainage coefficient is 0.9. The pavement was designed for 600 30-kip tandem axles per day and 1400 20-kip single axle loads per day. If the desired reliability was 90%, how long was this pavement designed to last?
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.
Question 3: A rigid pavement is designed with an 11-inch slab thickness, 95%
reliability, E, 4,000,000 lb/in', modulus of rupture of 650 lb/in', modulus of
subgrade reaction of 200 lb/in', a 3.2 load transfer coefficient, initial PSI of 4.7,
final PSI of 2.5 (A PSI = 2.2), overall standard deviation of 0.40, and a drainage
coefficient of 1.0. The pavement has 20 years design life. The pavement has three
lanes, with PDL = 0.6 for trucks that have three axles: one 25,000 single axle, one
32,000 lb tandem axle and one 50,000 lb triple axle. What is the daily estimated
truck traffic on the three lanes? Solve using AASHTO design Nomographs.
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
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 six-lane concrete roadway is being designed for a metropolitan area. This roadway will be constructed on a subgrade with an effective modulus of subgrade reactionk of 170 Ib/in^3. The ESAL used for the design period is 6.9* 10^6. Using the AASHTO design method, determine a suitable thickness of the concrete pavement (to the nearest 12 inch). provided that the working stress of the concrete to be used is 650 lb/in2 and the modulus of elasticity is 5 *10^6 Ib/in^2. Assume the initial serviceability is 4.75 and the terminal serviceability is 2,5. Assume the overall standard deviation, So, as 0.35, the load transfer coefficient J as 3.2. the drainage coefficient. Cd as 1.15. and R as 95%. Answer:arrow_forwardQ3: Evaluate whether Sin of slab thickness for rigid pavement will be adequate on a rural expressway for 20-year analysis period if design criteria are as follows: (30 Marks) Pi = 4.5, Pi=2.5, ESAL over design period = 10* 10, Concrete Elastic modulus, E, 6.5*10 Ib/in', Mean Concrete modulus of Rupture 800 Ib/in', Drainage Coefficient C= 1.0, R=0.95, S. = 0.3, K = 100 Ib/in', Load transfer coefficient 3.2arrow_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
- 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. Determine the number of daily trucks traveling in the peak direction.arrow_forwardB. A rigid pavement with a 10-inch slab thickness, 90 percent reliability, E. = 4 million lb/in², 600 lb/in² modulus of rupture, 150 lb/in³ modulus of subgrade reaction, a 2.8 load transfer coefficient, initial PSI of 4.8, final PSI of 2.5, overall standard deviation of 0.35, and a drainage coefficient of 0.8 is designed. The pavement's design life is 20 years. The three-lane road is built for vehicles with one 20,000-pound single axle, one 26,000-pound tandem axle, and one 34,000-pound triple axle. Calculate the projected daily truck traffic on the three lanes.arrow_forward3. A six-lane concrete roadway is being designed for a metropolitan area. This roadway will be constructed on a subgrade with an effective modulus of subgrade reaction k of 170 b/in3. The ESAL used for the design period is 2.5x106. Using the AASHTO design method, determine a suitable thickness of the concrete pavement (to the nearest 12 nch), provided that the working stress of the concrete to be used is 650 Ib/in? and the modulus of elasticity is 5x106 Ib/in?. Assume the initial serviceability is 4.75 and the terminal serviceability is 2.5. Assume the overall standard deviation, So, as 0.35, the load transfer coefficient J as 3.2, the drainage coefficient, Cd as 1.15, and R as 95%. You may use either the design equation or the graphical method.arrow_forward
- B. A rigid pavement with a 10-inch slab thickness, 90 percent reliability, E. = 4 million Ib/in?, 600 lb/in? modulus of rupture, 150 lb/in³ modulus of subgrade reaction, a 2.8 load transfer coefficient, initial PSI of 4.8, final PSI of 2.5, overall standard deviation of 0.35, and a drainage coefficient of 0.8 is designed. The pavement's design life is 20 years. The three-lane road is built for vehicles with one 20,000-pound single axle, one 26,000-pound tandem axle, and one 34,000-pound triple axle. Calculate the projected daily truck traffic on the three lanesarrow_forwardProblem 1: A flexible pavement section is designed using a CBR of 20 for the subgrade. During construction it is found that the subgrade is softer with a CBR of 7. The contractor proposes to place a layer of select fill on top of the subgrade to compensate for this condition. How thick should the select fill layer be if the original pavement section is 8 inches HMA over 12 inches crushed aggregate base over subgrade. Assume a resilient modulus of 15,000 psi for the select fill and clearly describe the design method used to solve this problem as well as any assumptions and results PROBLEM 2: Design a rigid pavement that will last as long as the flexible structure from problem 1arrow_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. 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.).arrow_forward
- 50 KPa is equivalent to: O A) 5x 10^6 N/m^2 O B) 5 x 10^5 N/m^2 O0 5 x 10^3 N/m^2 O D) 5 x 10^4 N/m^2 Concrete is required for a plain concrete pavement to be constructed in Southern Alberta. The pavement will be exposed to freezing, thawing, and deicers. If aggregates with a nominal maximum size of 20 mm are used, what is the minimum cement content per cubic meter of concrete as per the CSA Standard? OA) 320 kg O B) 335 kg OO 390 kg OD) 420 kg During Lab 5, the relative density of a coarse aggregate sample was determined. The sample of coarse aggregate was towel dryed to represent this moisture state: O A) OD B) Wet OC SSD O D) Air Dry When performing the slump test, each layer of concrete is rodded times as per CSA specifications: OA) 20 O B) 25 OO 30 O D) 12arrow_forwardUsing 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…arrow_forwardQ6: Designing a Rigid Pavement Using the AASHTO Method (Find D) Effective modulus of subgrade reaction, k = 480 lb/in³ Mean concrete modulus of rupture, Sc = 725 lb/in² Load transfer coefficient, J = 3.9 Ec = 4500000 Drainage coefficient, Ca = 1.0 Design serviceability loss, APSI = 1.5 ZR (Standard normal deviation) = -1.282 Overall standard deviation, So = 0.4 Cumulative 18 kip ESAL = (37900000)arrow_forward
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