subject: highway engineeringm complete solution Daily traffic amount and axle weightsDaily amountVehicle groupAxle typeAxle weightof passesLight vehicles|15,000Two identical single axles2,000 lbSteering, single axle14,000 lbSingle unit trucks|1,000Drive, tandem axle22,000 lbSteering, single axle10,000 lbTractor semi-trailertrucks350Drive, tandem axle20,000 lbTractor, triple axle46,000 lb Question 1.) You've been tasked to design a flexible pavement. The pavementserviceability index once operational must be 4.2, and is projected to decline to 2.5 inten years. The reliability for design is 95% with an overall standard deviation of 0.45.Determine the thickness of subbase required in inches (whole numbSubgrade and Pavement layer propertiesDrainageCoefficient, M;LayerThickness, D;MaterialWearing Surface4 inHot mix asphaltNot applicableBase6 inSoil cement0.94SubbaseTo be determinedCrushed stone1.0SubgradeSoil resilient modulus: 15,000 psi

Given: Thickness of the asphalt wearing surface D1 = 4 In Wearing surface layer coefficient, a1 =…

Answered: pav ndex once operational must be 4.2,…

pav ndex once operational must be 4.2, and is projected to reliability for design is 95% with an overall standard de thickness of subbase required in inches (whole numb

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The following figure shows concrete pavement with the layer thickness and elastic modulus as indicated. Assume modulus of rupture of 650 psi, load transfer coefficient of 3.2, serviceability loss from 4.5 to 2.5, and drainage coefficient of 0.9. The bedrock depth and loss of support is not considered for the subgrade. Use the design equation or monograph with 50% reliability to solve the following: 1) Determine the number of ESAL that the pavement can carry before failure. 2) If the daily traffic has 1080 single axles (20-kip), 400 single axles (24-kip), and 680 tandem axles (40-kip), and the annul traffic is the same over the design period, how many years would the concrete pavement last before failure? 8-inch Portland Cement Concrete Ec=4×106 psi 8-inch Granular Subbase Ec=30,000 psi Subgrade Mr = 5000 psi
Problem No. 1A flexible pavement for an urban interstate highway is to be designed using the AASHTOmethod to carry a design ESAL of 3 x 106. It is estimated that it takes about a week for water tobe drained from within the pavement and the pavement structure will be exposed to moisturelevels 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(a) Consider designing the same pavement with only asphalt concrete and base layer (excluding subbase layer). Use the information provided in Problem 1. (b) Compare strengths and weaknesses of each design.
Plz, solve this proboem. Transportation Engineering-2 Estimate what standard PG asphalt binder grade should be selected if the seven-day maximum pavement temperature has a mean of 680 C and a standard deviation of 2.50 C. The minimum pavement temperature has a mean of -220 C and a standard deviation of 30 C. Use a Reliability level of 99 %. Note: seven-day maximum and minimum pavement temperatures are normally distributed (use cumulative standard normal distribution tables)
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A 7 inch Hot Mix Asphalt layer is placed directly on a subgrade soil which has a resilient modulus of 10,000 psi. The estimated future ESAL is 20 million. Use AASHTO and Asphalt Institute method to check the available thickness and the need for overlay. The resilient modulus of HMA is 450,000psi. Assume any missing data within the normal range
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Q:Discuss various tests used for the quality of aggregate used in flexible pavements.
What standard PG asphalt binder grade should be selected under the following conditions:a. The seven-day maximum pavement temperature has a mean of 62°C and a minimum pavement temperature of -15°C. (table9.2) b. According to part a, what is your recommendation for 20 million ESALs and 50 km/h speed? (table ESALs) c. For 50 million ESALs and 80 km/h speed. (table ESALs)
an interstate highway pavement composed of a hma surface course, a cement treated base course, and a sand–gravel subbase is to be designed for an esal of 1.2*10^6.the quality of drainage is considered fair because water can be removed from the subbase within a week. however, there is a large amount of precipitation, so more than 25% of the time the pavement will be exposed to moisture levels approaching saturation. the material properties are as follows: effective roadbed soil resilient modulus = 5,500 psi, resilient modulus of subbase = 15,000 psi, unconfined compressive strength of cement-treated base at 7 days = 500 psi, and resilient modulus of hma = 4.3*10^5 psi. assuming a minimum thickness for hma, determine the thicknesses of the surface, base,and subbase courses required. Assuming a minimum thickness for HMA, determine the thicknesses of the surface, base,and subbase courses required.