Question It is required to design a collector road pavement in an urban area composed of 3 layers with different material and resilient modulus values as shown in Figure 1. Given, ESAL=1.0*106, drainage quality is good. Less than 25% of the time the pavement will be exposed to moisture levels approaching saturation. Determine the thickness of the pavement courses layers. Assume So=0.35 and APSI=2.0. HMA surface Untreated base course Sand gravel subbase E1-500000 psi D1 E2= 20000 psi D2 E3=15000 psi D3 MR=5500 psi

Question It is required to design a collector road pavement in an urban area composed of 3 layers with different material and resilient modulus values as shown in Figure 1. Given, ESAL=1.0*106, drainage quality is good. Less than 25% of the time the pavement will be exposed to moisture levels approaching saturation. Determine the thickness of the pavement courses layers. Assume So=0.35 and APSI=2.0. HMA surface Untreated base course Sand gravel subbase E1-500000 psi D1 E2= 20000 psi D2 E3=15000 psi D3 MR=5500 psi

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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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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By the Asphalt Institute method, determine the allowable ESAL for a 3.5-inch overlay on an asphalt pavement with a representative rebound deflection of 0.075 inches. E2 = (1.5x70x6.4)/0.062 = 10840 psi Deflection = 0.04621 ESAL = 347000
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