Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 19, Problem 16P
To determine
The design of a flexible pavement using the California (Hveem) method.
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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
4- Describe the characteristics and functions of the top layer in a pavement system.
Characteristics 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 life
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- Comparing Rigid and Flexible Airport Pavement .arrow_forwardDesign a pavement for a rural interstate highway. The expected design ESAL is 13x106. The pavement structure is to consist of asphalt concrete with an elastic modulus of 400000psi, a granular base with an elastic modulus of 26000psi, and a granular subbase with an elastic modulus of 12000psi. The elastic modulus of the subgrade is 8000psi. It is estimated that it will take a week for water to drain from the pavement and that the pavement will be saturated about 15% of the time. Assume that a reliability level o about 90% is required and that the initial serviceability index is 4.2 and the final serviceability index is 2.5.arrow_forwardProblem 1: Make a diagram showing the comparison between Flexible and Rigid Pavement. Categorize the comparison based on the type and number of layers, materials used, design input data, suitability, durability etc. Note: For reference use AASHTOarrow_forward
- What is the purpose of pavement structure? Discuss various layers in structure of flexible pavement in detail.arrow_forwardPlease solve this question in step by step- It is transportation-2 Civil engineering My last digit of my registration number =2 Q6. Using the AASHTO flexible pavement design procedure, design (i.e. thicknesses of the different layers) a pavement for a rural interstate highway (i.e. it is a freeway). The expected design ESAL is 8x10 . The pavement structure is to consist of asphalt concrete with a resilient modulus of 400,000 psi (with a corresponding structural layer coefficient of 0.42), a granular base with a resilient modulus of 34,000 psi, and a granular subbase with a resilient modulus of (15,000+ last digit of your Registration No.) psi. The resilient modulus of the subgrade is 7,000 psi. A Structural Number SN, = 5.4 was obtained using a subgrade M, = 7000 psi using the AASHTO 1993 flexible pavement design method. Also, a Structural Number SN, = 4.3 was obtained using a Subbase M, =15000 psi . Finally, a Structural Number SN, = 3.2 was obtained using a Base M, = 34000 psi . It…arrow_forward17. 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 subgradearrow_forward
- Q#1 What is the primary function of the pavement structure? Why do we use high quality materials as we go from bottom to top of the pavement structure? Discuss various tests used for the quality of bitumen used in flexible pavements. Discuss various tests used for the quality of aggregate used in flexible pavements.arrow_forwardWhat is the purpose of pavement structure? Discuss various layers in structure of flexible pavement in detail. Subject: transportation engineeringarrow_forward(6) Two AC-20 asphalt concrete core samples are taken from an existing flexible pavement. Each sample has a diameter of 4 inches and a thickness of 2.5 inches. (a) If the first sample, tested in the indirect tensile apparatus, failed under a maximum load of 2,500 lbs, calculate the tensile strength of the AC-20 asphalt concrete mixture. (b) Under a dynamic load of 50 lbs, applied on the second specimen in the transducer arrangement for the diametral modulus test, a horizontal recoverable deformation of 0.076*10 inches is measured at 70° F. What is the resilient modulus of the asphalt concrete (AC) layer in the field (use the equation on page 283)?arrow_forward
- Traffic loading in the flexible pavement design equation is equal to the number of vehicles that use the roadway over its lifetime. True Falsearrow_forwardThe design equations for flexible pavements were determined as a result of laboratory experiments. True Falsearrow_forwardA pavement consists of 5 inches of asphalt underlain by a crushed stone based course. There is no sub base. The asphalt has an elastic modulus of 350,000 psi at room temperature and the base course has a CBR of 70. Determine the thickness of the crushed stone base needed to reach an SN of 2.85. Assume the base course is saturated 5% of the time and drains within a day.arrow_forward
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