Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 20, Problem 21P
To determine
The minimum depth of concrete pavement by using the PCA design method.
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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.
How sensitive are the critical pavement
responses to (a) increased tire pressure, (b)
increased subgrade strength, (c) Poisson's
ratio changes, (d) lime stabilization of top 6
in. of subgrade, (e) asphalt or cement
stabilization of base layer, etc.?
Find the quantity of cement, sand and gravel of the concrete pavement 4" thick
as shown in Figure 1-10 using class "B" concrete.
Chapter 20 Solutions
Traffic and Highway Engineering
Ch. 20 - Portland cement concrete consists of what four...Ch. 20 - List and briefly describe the five main types of...Ch. 20 - What is the main requirement for the water used in...Ch. 20 - Prob. 4PCh. 20 - Prob. 5PCh. 20 - Prob. 6PCh. 20 - Prob. 7PCh. 20 - Prob. 8PCh. 20 - Prob. 9PCh. 20 - Prob. 10P
Ch. 20 - Prob. 11PCh. 20 - Prob. 12PCh. 20 - Repeat Problem 20-12, with the slab containing...Ch. 20 - Prob. 14PCh. 20 - Prob. 15PCh. 20 - Prob. 16PCh. 20 - Prob. 17PCh. 20 - Prob. 18PCh. 20 - An existing rural 4-lane highway is to be replaced...Ch. 20 - Prob. 20PCh. 20 - Prob. 21PCh. 20 - Prob. 22PCh. 20 - Prob. 23PCh. 20 - Prob. 24PCh. 20 - Prob. 25PCh. 20 - Prob. 26PCh. 20 - Prob. 27P
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- Q#3. Discuss root causes and remedial measures of the following distresses occurring in flexible pavements: Slippage failure, Potholes, Rutting and its types, Bitumen bleedingarrow_forwardComparing Rigid and Flexible Airport Pavement .arrow_forwardFind the safe static wheel load that a 360 mm thick rigid pavement could carry without any dowel across the joints if the allowable tensile stress of concrete is 1.5 MPa.arrow_forward
- A rigid pavement is to be designed for a wheel load of 53.5 kN. If the tensile strength of concrete is taken as 1.38, determine the required thickness assuming sufficient dowels and tie bars are provided.arrow_forwardDefine the importance of air void content in bituminous pavements?arrow_forwardDiscuss the following terms briefly: I. Emulsion breaking and Cutback curing, III. Flexible pavement and Rigid pavements, VII. Breast wall and retaining wall.arrow_forward
- 2- Describe six of the main differences between rigid and flexible pavements.arrow_forwardQuestion 13 A rigid pavement has a wheel load capacity of 59.92 kN. The allowable tensile stress of concrete is 1.29 MPa. Determine the thickness fcm) of the pavement if dowels are negligible Express your answer in 1 decimal place. A Moving to another question will save this response 8< Question 13 of 50 acer F11 F12 PrtSc Pause Del Home PgL F6 F7 F8 F9 F10 F4 F5 Scr Lk SysRq Break Ins DIO & Backspace 5 € 6. 7 8 9. R Yarrow_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
- 4- Describe the characteristics and functions of the top layer in a pavement system.arrow_forwardQuestion 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.arrow_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_forward
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