Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Chapter 19, Problem 12P
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A 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.
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A flexible pavement is constructed with 4 inches of hot-mix asphalt (HMA) wearing surface, 8 inches of emulsion/aggregate-bituminous base, and 8 inches of crushed stone subbase. The subgrade has a soil resilient modulus of 10,000 lb/in^2, and M2 and M3 are equal to 1.0 for the materials in the pavement structure. The overall standard deviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kip single axles,400 24-kip single axles, and 680 40-kip tandem axles. How many years would you estimate this pavement would last (how long before its PSI drops below a TSI of 2.5) if you wanted to be 99%confident that your estimate was not too high
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- I need correct solutionarrow_forwardA flexible pavement is constructed with 4 in. (10.16 cm) of hot mix asphalt wearing surface, 8 in. (20.32 cm) of emulsion/aggregate- bituminous base, and 8 in. (20.32 cm) of crushed stone subbase. The subgrade has a soil resilient modulus of 10,000 psi (68.95 MPa), and M2 and M3 are equal to 1.0 for the materials in the pavement structure. The overall standard deviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kip (89.0-kN) single axles, 400 24-kip (106.8-kN) single axles, and 680 40-kip (177.9-kN) tandem axles. How many years would you estimate this pavement would last (i.e., how long before its PSI drops below a TSI of 2.5) if you wanted to be 99% confident that your estimate was not too high, and if you wanted to be 95% confident that your estimate was not too high? Use the editor to format your answerarrow_forwardNonearrow_forward
- A flexible pavement is constructed with 3 inches of hot-mix asphalt (HMA) wearingsurface, 6 inches of emulsion/aggregate-bituminous base, and 6 inches of crushedstone subbase. The subgrade has a soil resilient modulus of 8,000 lb/in2 , and M2 andM3 are equal to 1.0 for the materials in the pavement structure. The overall standarddeviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kipsingle axles, 400 24-kip single axles, and 680 40-kip tandem axles. How many yearswould you estimate this pavement would last (how long before its PSI drops below aTSI of 2.5) if you wanted to be 90% confident that your estimate was not too high,and if you wanted to be 99% confident that your estimate was not too high?arrow_forwardplease answer asap. thank you so much..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_forward
- If pavement and sub grade are considered as two layer system a stiff factor is to be introduced to take into account the different values of modulus of elasticity of the two layers. if the modulus of elasticity of the subgrade is 100 kg/cm2 and the modulus of elasticity of the pavement is 1000kg/cm2, what is the stiffness factor ?arrow_forwardCEarrow_forwardProblem 32: What is the stiffness factor of a pavement if the modulus of elasticity is 180 MPa and whose subgrade modulus is 40 MPa?arrow_forward
- Please show all of your work and give the correct answer.arrow_forwardComparing Rigid and Flexible Airport Pavement .arrow_forwardUsing the AASHTO rigid design procedure, design a pavement for a provincial road with an expected design ESAL of 20 x 106. The pavement structure is to consist of Portland cement concrete with an elastic modulus of 5.0 x 106 psi and a modulus of rupture of 550 psi, and a 12 in. thick unbounded granular material as subbase. The pavement is to be plain jointed and jointed reinforced concrete with tied P.C.C. shoulder and having load transfer devices. The climate consists of a wet season (November-April) and a dry season (May-October). Freezing of the subbase and subgrade is considered negligible. The elastic modulus of the subbase is 20,000 psi during the dry season and 15,000 psi during the wet season. The elastic modulus of the subgrade is 6,000 psi during the dry season and 3,500 psi during the wet season. The subgrade depth to the bedrock is 5ft. It is estimated that it will take a day for water to drain from the pavement and that the pavement will be saturated about 20 percent of…arrow_forward
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