Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 20, Problem 22P
To determine
The minimum depth of concrete pavement required for the design period of
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A rigid pavement is to be used to carry a wheel load of 49KN, the allowable tensile stress of the concrete is 1.4MPa. Sufficient dowels are used across the joints. Design the center of the thickness of the pavement at the center and base
A flexible pavement has a structural number of 3.8(all drainage coefficients are equal to 1.0). The initialPSI is 4.7 and the terminal serviceability is 2.5. The soilhas a CBR of 9. The overall standard deviation is 0.40and the reliability is 95%. The pavement is currentlydesigned for 1800 equivalent 18-kip single-axle loadsper day. If the number of 18-kip single-axle loads wereto increase by 30%, by how many years would thepavement’s design life be reduced?
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Determine the thickness base and subgrade of flexible pavement if the wheel load is 90 kN and has wheel contact area of 88075 sq. mm.. Strength capacity of base is 0.35 MPa and 0.15 MPa for Subgrade.
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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- 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?arrow_forwardA 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 necessaryarrow_forwardA 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%.arrow_forward
- 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.)arrow_forwardDetermine the safe thickness of rigid pavement if the wheel load is 85 kN and f'c=32 MPa.arrow_forwardA 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?arrow_forward
- Show complete solution and clear explanation thanks A rigid pavement of the proposed provincial road is to be used to carry a maximum wheel load of 60KN. Neglect the effect of dowels f'c=20MPa. Allowable tensile stress of concrete pavement is 0.6f'c. Calculate the allowable tensile stress of the concrete pavement and thickness of the pavementarrow_forwardA six-lane concrete roadway is being designed for a metropolitan area. This roadwaywill be constructed on a subgrade with an effective modulus of subgrade reaction k of170 lb/in3. The ESAL used for the design period is 2.5 106. Using the AASHTOdesign method, determine a suitable thickness of the concrete pavement (to thenearest 1⁄2 inch), provided that the working stress of the concrete to be used is650 lb/in2 and the modulus of elasticity is 5 106 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 as1.15, and R as 95%.20-14 An existing rural four-lane highway is to be replaced by a six-lane divided expressway(three lanes in each direction). Traffic volume data on the highway indicate that theAADT (both directions) during the first year of operation is 24,000 with the followingvehicle mix and axle loads.Passenger cars…arrow_forwardA 33 mm thick flexible pavement carrles a static wheel load having a circular contact area of the tire ls 75 476 m㎡, the transmitted load is distributed across the wider area of the sub grade at an angle of 45°. The subgrade bearing value Is 180.0 Kpa, while that of the base is 450,0 Kpa.Sketch &Design the thickness of the base.arrow_forward
- A flexible pavement has a structural number of 3.8 (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 design life be reduced?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_forwardFor the following temperature conditions, calculate the proper PG grade for both 50% and 98% reliabilities (show your calculation).Seven-day maximum pavement temperature of 48°C with a standarddeviation of 2.5°C. Minimum pavement temperature of -21°C with a standard deviation of 3°C.arrow_forward
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