A PCC pavement is designed with a base layer of 100,000 psi modulus and loss of support factor 1.0. If the effective modulus of subgrade reaction is determined 300 (pci). What is the effective modulus of subgrade reaction after correction for potential loss of support?

A PCC pavement is designed with a base layer of 100,000 psi modulus and loss of support factor 1.0. If the effective modulus of subgrade reaction is determined 300 (pci). What is the effective modulus of subgrade reaction after correction for potential loss of support?

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 22P

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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.
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.
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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)
Given ESAL = 5 x 10 6, Pe = 2.5%, PP = 0.02%, PSI = 1 .7, and MR = 5000 psi, deter -mine the structural number SN of the mainline and shoulder pavement required for a reliabilityof 50% .
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
A rigid pavement is designed with a 10-inch slab,an Ec of 6 million lb/in^2, a concrete modulus of rupture of 432 lb/in^2, a load transfer coefficient of 3.0, an initial PSI of 4.7, and a terminal serviceability index of 2.5.The overall standard deviation is 0.35, the modulus of subgrade reaction is 190 lb/in^3, and a reliability of 90%is used along with a drainage coefficient of 0.8. The pavement is designed assuming traffic is composed entirely of trucks (100 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 structural number of 4 and is expected to last the same number of years as the rigid pavement. What is the assumed soil resilient modulus? (Assume all other factors are the same as for the rigid pavement.)
Show complete solution and clear explanation thank you A flexible pavement having a thickness of 46mm carries a static wheel load of W. The circular contact has an equivalent radius of 150mm. If the load W is assumed to be transmitted across a wide are of subgrade at an angle of 45 degrees compute the value of the wheel load W if the bearing stress of the base is 0.42 MPa
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.
A rigid pavement is designed with an 11-inch slab thickness, 90% Rellability (ZR = -1.282), Es = 4 million psi, modulus of rupture of 600 psi, modulus of subgrade reaction of 150 lb/in?, a 2.8 load transfer coefficient, initial PSI = 4.8, final PSI of 2.5, overall standard deviation of 0.35, and a drainage coefficient of 0.80. The pavement has a 20-year design life. The pavement has three lanes in one direction (PDL = 0.80) and is conservatively designed for trucks that have one 20,000-lb single axle load (1.58), one 26,000-lb tandem axle (0.619), and one 34,000-b triple axle (0.593). What is the daily estimated truck traffic on the three lanes? logia (APSI) S,C¢(D@7% – 1.132) 3.0 [1.62410x10 |(D + 1)*46 | log10 (W) = Zg5, + 7.35 (log,0( D + 1)) – 0.06 +: +(4.22 - 0.327SI) log10 1+ 18.42 215.63/ De75 - 0.25
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.
Flexible pavement in rural interstate highway. Design ESAL 3000000 Subbase exposed to moisture saturation 5% of time & drainage quality is fair. Base saturation level 10% of time (Fair drainage quality). Mr (HMA) 420,000 psi Mr (base) 24,000 psi Mr (subbase) 10,000 psi CBR (Subgrade) = 1.0 Reliability Level R = 85% So 0.45 APSI = 2 Required: 1) Design the pavement by the AASHTO method 2) If the total traffic reaches double, what is the percent of the slab thickness increased