C. With a 12-year design life, a flexible pavement was developed for the following daily traffic: 1300 single axles weighing 8,000 pounds each, 900 tandem axles weighing 15,000 pounds each, 20 single axles weighing 40,000 pounds each, and 200 tandem axles weighing 40,000 pounds each. 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase were used to construct the roadway. All drainage coefficients were 1.0, the total standard deviation was 0.5, the APSI was 2.0 (with a TSI of 2.5), and the reliability was 70%. What was the subgrade's soil resilient modulus when it was designed? (

C. With a 12-year design life, a flexible pavement was developed for the following daily traffic: 1300 single axles weighing 8,000 pounds each, 900 tandem axles weighing 15,000 pounds each, 20 single axles weighing 40,000 pounds each, and 200 tandem axles weighing 40,000 pounds each. 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase were used to construct the roadway. All drainage coefficients were 1.0, the total standard deviation was 0.5, the APSI was 2.0 (with a TSI of 2.5), and the reliability was 70%. What was the subgrade's soil resilient modulus when it was designed? (

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter19: Design Of Flexible Highway Pavements

Section: Chapter Questions

Problem 16P

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C. With a 12-year design life, a flexible pavement was developed for the following daily traffic: 1300 single axles weighing 8,000 pounds each, 900 tandem axles weighing 15,000 pounds each, 20 single axles weighing 40,000 pounds each, and 200 tandem axles weighing 40,000 pounds each. 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphaltic base, and 8 inches of crushed stone subbase were used to construct the roadway. All drainage coefficients were 1.0, the total standard deviation was 0.5, the APSI was 2.0 (with a TSI of 2.5), and the reliability was 70%. What was the subgrade's soil resilient modulus when it was designed?
Show transcribed image text 1. Truck A has two single axles. One axle weighs 12,000 Ib and the other weighs 23,000 lb. Truck B has an 8000-lb single axle and a 43,000-lb tandem axle. On a flexible pavement with a 3-inch hot-mix asphalt (HMA) wearing surface, a 6-inch soil-cement base, and an 8-inch crushed stone sub base, which truck will cause more pavement damage? (Assume drainage coefficient are 1.0.) Hints: use linear interpolation if SN is not integer. 2. A highway has the following pavement design daily traffic: 300 single axles at 10,000 lb each, 120 single axles at 18,000 lb each, 100 single axles at 23,000 Ib each, 100 tandem axles at 32,000 lb each, 30 single axles at 32,000 lb each, and 100 triple axles at 40,000 lb each. A flexible pavement is designed to have 4 inches of sand-mix asphalt wearing surface, 6 inches of soil- cement base, and 7 inches of crushed stone sub base. The pavement has a 10-year design life, a reliability of 85%, an overall standard deviation of 0.30,…
Give 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 elasticity
Q2: The traffic on the design lane of a proposed four-lane rural interstate highway consists of 40% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1150, pi = 4.5, and pt = 2.5 . Growth rate = 3% Design life = 20 years Reliability level = 95% Standard deviation = 0.45 The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 and 22, respectively, and Mr for the asphalt mixture, 3102 MPa (450,000 lb/in2).
Problem No. 1A flexible pavement for an urban interstate highway is to be designed using the AASHTO method to carry a design ESAL of 3 x 106. It is estimated that it takes about a week for water to be drained from within the pavement and the pavement structure will be exposed to moisture levels approaching saturation for 30% of the time. The following additional information is available: Elastic modulus of asphalt concrete = 450,000 psiResilient modulus of base material = 35,000 psiResilient modulus of subbase material = 15,000 psiCBR of subgrade material = 8
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.
Q, Discuss the following terms briefly: a, Emulsion breaking and Cutback curing, b, Water bound and aggregate base, c, Flexible pavement and Rigid pavements,
11. The range of typical terminal serviceability indices (pt) used in design of highway pavements is:a. -1.0 and 0.0b. 0.0 and 1.0c. 2.0 and 2.5d. 10.0 and 20.0 14. In the AASHTO 1986 and 1993 design guide, the following modification(s) was(were) incorporated in the design procedure:a. Reliabilityb. Changes in modulus of elasticity subgrade materials due to climatec. Drainage layersd. All of the above15. Interstate highways should be designed for a lower level of reliability as compared to secondary roads.a. Trueb. False 17. In the Asphalt Institute flexible pavement design approach, Where are the critical stress and strain locations checked?a. Top of the asphalt concrete layerb. Middle of the asphalt concrete layerc. Bottom of the asphalt concrete layerd. Bottom of the asphalt concrete layer and top of the subgrade 19. In the Portland Cement Association (PCA) design of rigid highway pavements, the design approach is based on:a. Fatigue Damageb. Erosion Damagec. Both Fatigue Damage and…
The traffic on the design lane of a proposed four-lane rural interstate highway consists of 40 percent trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement if the Average Annual Daily Traffic (AADT) on the design lane during the first year of operation is 1000, initial serviceability (Po) = 4.4, and terminal serviceability (Pt) = 2.5. Growth rate = 4 percent Design life = 20 years Reliability level = 95 percent The pavement structure will be exposed to moisture levels approaching saturation 20 percent of the time, and will take about one week for drainage of water. California Bearing Ratio (CBR) of the subgrade material is 7. CBR of the base and subbase are 70 and 22 respectively, and Resilient Modulus (Mr) for asphalt concrete is 450,000 lb/in2.
A dual wheel having a load per tire of 5000 Ib, 70 psi pressure and μ = 0.5. Calculate thetotal pavement deflections due to the dual wheel by one-layer theory at the followingradial distances from the centerline of one tire: r=0, 3.5,10.5. (Use Pavement Thickness= 8in).
A highway has the following pavement design daily traffic: 300 single axles at 10,000 lb each, 120 single axles at 18,000 lb each, 100 single axles at 23,000 lb each, 100 tandem axles at 32,000 lb each, 30 single axles at 32,000 lb each, and 100 triple axles at 40,000 lb each. A flexible pavement is designed to have 4 inches of sand-mix asphalt wearing surface, 6 inches of soil cement base, and 7 inches of crushed stone sub base. The pavement has a 10-year design life, a reliability of 85%, an overall standard deviation of 0.30, drainage coefficients of 1.0, an initial PSI of 4.7, and a TSI of 2.5. What is the minimum acceptable soil resilient modulus?
Discuss the following terms briefly: I. Emulsion breaking and Cutback curing, III. Flexible pavement and Rigid pavements, VII. Breast wall and retaining wall.