TRAFFIC AND HIGHWAY ENG (LL) + WEBASSIG
5th Edition
ISBN: 9780357323878
Author: Garber
Publisher: CENGAGE L
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Chapter 20, Problem 14P
To determine
A suitable thickness of the concrete pavement if the working stress of the concrete is
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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%.
Determine the thickness of a rigid pavement with a wheel load capacity of 54 kN, if
the allowable tensile stress of the concrete is 1.6 MPa. Neglect the effect of
dowels.
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:
Chapter 20 Solutions
TRAFFIC AND HIGHWAY ENG (LL) + WEBASSIG
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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- 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%.arrow_forwardA rigid pavement is to be used to carry a wheel load of 58.77 kN. Enough dowels will be used across the joint. The allowable tensile strength of concrete is 1.45 MPa. Thus, what will be the difference in thickness (in mm) between the edge and the center of the pavement?arrow_forwardQ3/Choose the correct answer 1. In general PSI for flexible pavement depend on............ Va. Cracking, Patching and Rutting b. Cracking and Patching c. Patching and Rutting d. Rutting 2. The Maximum contraction joint spacing for plain jointed concrete pavement is C. 3.5 m b. 4.5 m c. 5.5 m d. Depends on traffic load 3. The relationship between A psi and age of pavement is...... a. A psi co age Apsi ∞ (1/age) c. A psi 02(1/age) d. Non of the above 4. The surface of the pavement should be a. Smooth b. Rough 5. Which type of aggregates gives good workability? a. Round b. Flaky c. Angular 6. Rutting may be avoided by a. Good compaction . Sufficient enough to resist skid b. Good drainage 7. Bleeding may be avoided by a. Water voids b. Air voids c. Asphalt type 12. Tie bars in cement concrete pavements are at a. Expansion joints d. All the above acceptable c. High filler percent All the above 8. The good drainage in pavement can La Increase the pavement life b. Decrease the pavement life…arrow_forward
- 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%.arrow_forwardAn undowelled rigid pavement in a subdivision roadway has thickness equivalent to 300mm. What should be the allowable tensile strength of concrete in MPa in order to support a wheel load equivalent to 9kN?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 used to carry a wheel load of 50.93 kN. Enough dowels will be used across the joint. What will be the difference in thickness (in mm) between the edge and the center of the pavement? The allowable tensile strength of concrete is 1.39 MPa.arrow_forwardAn undowelled rigid pavement in a subdivision roadway has thickness equivalent to 300 mm. What should be the allowable tensile strength of concrete in MPa in order to support a wheel load equivalent to 9 kN?arrow_forwardCharacteristics of concrete (rigid) pavement (Select two) Please select all applicable answers. Lower Initial cost Higher initial cost Easier to maintenance Easier to recycle Shorter life O Longer lifearrow_forward
- A flexible pavement having a thickness of 46 mm carries a static wheel load of "W". The circular contact are of time has an equivalent radius of 150 mm. If the load "W" is assumed to be transmitted across a wide area of subgrade at an angle of 45°, compute the value of wheel load "W" if the bearing stress of the base is 0.42 MPa.arrow_forwardWhat is the average pavement density if the pavement thickness is 300mm by expansion pressure method. The expansion pressure is 0.150kg/cm².arrow_forwardGive me right solution... Urgent please A 5 tonne wheel load is applied on a pavement and generates a surface deflection of 0.15 mm. A. If the pavement is 125 mm thick, what is the vertical stress at the top of the subgrade? B. If the equivalent radius of tyre contact is 100 mm and Poisson’s ratio is 0.3, what is the pavement’s modulus of elasticityarrow_forward
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