A concrete pavement is to be constructed for a 4-ane urban expressway on a subgrade with an effective modulus of subgrade reaction k of 100 Ibin The accumulated equivalent axle bad for the design period is 3.25 x 10. The initial and terminal serviceabilily indices are 4.5 and 2.5, respectively. Using the AASHTO design method determine a suitable thickness of the concrete pavement, ř the working stress of the concrete is 600 blin2 and the modulus of elasticity is 5 x 106 bin?. Take the overal standard deviation, SO , as 0.30, the bad transfer coefficient, J, as 3.2, the drainage coefficent as 0.9, and R-95%. Thíckness of the conarete pavement:

A concrete pavement is to be constructed for a 4-ane urban expressway on a subgrade with an effective modulus of subgrade reaction k of 100 Ibin The accumulated equivalent axle bad for the design period is 3.25 x 10. The initial and terminal serviceabilily indices are 4.5 and 2.5, respectively. Using the AASHTO design method determine a suitable thickness of the concrete pavement, ř the working stress of the concrete is 600 blin2 and the modulus of elasticity is 5 x 106 bin?. Take the overal standard deviation, SO , as 0.30, the bad transfer coefficient, J, as 3.2, the drainage coefficent as 0.9, and R-95%. Thíckness of the conarete pavement:

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter20: Design Of Rigid Pavements

Section: Chapter Questions

Problem 17P

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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.
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:
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 lb/in3. The ESAL used for the design period is 2.5 ? 106. Using the AASHTO design method, determine a suitable thickness of the concrete pavement (to the nearest 1⁄2 inch), provided that the working stress of the concrete to be used is 650 lb/in2 and the modulus of elasticity is 5 ? 106 lb/in2. Assume the initial service- ability is 4.75 and the terminal serviceability is 2.5. Assume the overall standard devi- ation, So, as 0.35, the load transfer coefficient J as 3.2, the drainage coefficient, Cd as 1.15, and R as 95%.
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.
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 lb/in3. The ESAL used for the design period is 2.5 x 106. Using the AASHTO design method, determine a suitable thickness of the concrete pavement (to the nearest 1⁄2 inch), provided that the working stress of the concrete to be used is 650 lb/in2 (i.e. S’c) and the modulus of elasticity is 5 x 106 lb/in2. 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, ZR as -1.645 and R as 95%.
A concrete pavement is to be constructed for a four-lane urban expressway on a subgrade with an effective modulus of subgrade reaction k of 100 lb/in3. The accumulated equivalent axle load for the design period is 3.25 x 106. The initial and terminal serviceability indices are 4.5 and 2.5, respectively. Using the AASHTO design method, determine a suitable thickness of the concrete pavement if the working stress of the concrete is 600 lb/in2 and the modulus of elasticity is 5 x 106lb/in2. Take the overall standard deviation So as 0.30, the load-transfer coefficient J as 3.2, the drainage coefficient as 0.9, and R = 95%.
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 lanes
Q: Evaluate whether 9in of slab thickness for rigid pavement will be adequate on a rural expressway for 20-year analysis period if design criteria are as follows: Pi = 4.5 Pt =2.5 ESAL over design period = 6* 10 Concrete Elastic modulus, Ee = 5*106 Ib/in? %3D Mean Concrete modulus of Rupture 700 Ib/in? Drainage Coefficient Ca = 1.0 R = 0.95 So = 0.3 K = 170 Ib/in %3D Load transfer coefficient = 3.2
Q6: 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)
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.
3- What is meant by JRCP in rigid pavements? Explain its characteristics.
B. 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.