28. The PCA rigid pavement design chart for a B-777-300 aircraft is shown in Figure 7.7.3 attached. Whatwould be the required pavement thickness if the weight on the main landing gear is 627,700 lb, amodulus of subgrade reaction-300 psi/in, and a 28-concrete flexural strength=820 psi? The pavement isto be designed for a critical area and requires a safety factor-2.0.a. 6.0 inchesb. 8.0 inchesc. 14.0 inches17.0 inchesd. 50PAVEMENT THICKNESSG15(CENTIMETERS)3450KM41ISCHONIKA2NOTE: TIRES - 50 x 20 R22 32 PR AT 215 PSI (15.12 KG/CM SO)- MAX MJV POSSIBLE MAINGEAR LOAD AT MAXIMUMDESIGN TAXI WEIGHT AND[AFT C.G. (662,000 LB MTW)****WEIGHT ON MAINLANDING GEAR(SEE SEC 7,4)627,700 284,800550,000 249,550500,000 226,850450,000 204,150400,000350.000 158,800NOTE:THE VALUES OBTAINED BY USING THEMAXIMUM LOAD REFERENCE LINE ANDANY VALUE OF ARE EXACT.FOR LOADS LESS THAN MAXIMUM. THE CURVESARE EXACT FOR K = 500 BUT DEVIATESLIGHILT FOR OTHER VALUES OF K.Figure 7.7.3 Boeing 777-300 Aircraft800200REFERENCES:"DESIGN OF CONCRETE AIRPORTPAVEMENT" AND "COMPUTERPROGRAM FOR AIRPORT PAVEMENTDESIGN - PROGRAM POILE™PORTLAND CEMENT ASSOCIATION.900-6042in(OS NO/DX)ALLOWABLE WORKING STRESS

We have to find out the pavement thickness.

28. The PCA rigid pavement design chart for a B-777-300 aircraft is shown in Figure 7.7.3 attached. What would be the required pavement thickness if the weight on the main landing gear is 627,700 lb, a modulus of subgrade reaction=300 psi/in, and a 28-concrete flexural strength=820 psi? The pavement is to be designed for a critical area and requires a safety factor-2.0. a. 6.0 inches b. 8.0 inches c. 14.0 inches d. 17.0 inches

28. The PCA rigid pavement design chart for a B-777-300 aircraft is shown in Figure 7.7.3 attached. What would be the required pavement thickness if the weight on the main landing gear is 627,700 lb, a modulus of subgrade reaction=300 psi/in, and a 28-concrete flexural strength=820 psi? The pavement is to be designed for a critical area and requires a safety factor-2.0. a. 6.0 inches b. 8.0 inches c. 14.0 inches d. 17.0 inches

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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Repeat Problem 19-7 using two different depths of untreated aggregate bases of 6 in. and 12 in. Highway contractors in your area can furnish rates for providing and properly laying an asphalt concrete surface and untreated granular base. Assume a structural coefficient of 0.12 for the base course. If these rates are available, determine the cost for constructing the different pavement designs if the highway section is 5 miles long and the lane width is 12 ft. Which design will you select for construction?
answer with complete solution. Asap 1. determine the safe thickness of rigid pavement if the wheel load is 85 kN and f'c = 32 MPa
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.
A flexible pavement has a SN of 4 (all drainage coefficients are equal to 1.0). The initial PSI is 4.7 and the terminal serviceability is 2.5. The soil has a CBR of 9. The overall standard deviation is 0.40 and the reliability is 95%. The pavement is currently designed for 1800 equivalent 18-kip single-axle loads per day. If the number of 18-kip single-axle loads were to increase by 30%, by how many years would the pavement's design life be reduced? For SN, please round-off to the nearest whole number if necessary
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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%.
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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
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