Purdue University
School of Civil Engineering
CE 361 Introduction to Transportation Engineering
Fri. 2 November 2012
Class on Rigid Pavement Design and Pavement Management Systems
Instructional Objectives:
By the end of this lesson,
the student will be able to ...
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Show how Rigid Pavement design is accomplished using Design Charts.
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List the elements of a Pavement Management System:
- Pavement Performance Curves
- Pavement Failure modes
- Five major causes of distress
- Measuring pavement condition
- Life Cycle Cost Analysis
Prep:
Read FTE Chapter 9 Sections 4.1, 4.2, 4.4, 4.5, and 4.7, and Section 5.
Bring a photocopy of FTE Figures 9.26 and 9.27 to class,
along with a straightedge.
Theme music:
Outline of Likely Topics
Rigid Pavement Design
Input data:
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Expected total ESALs for the design period
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Modulus of subgrade reaction, k
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Concrete elastic modulus, E(c)
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Modulus of rupture, S'(c)
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Load transfer coefficient, J
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Drainage coefficient, C(d)
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Standard deviation, S(o)
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Reliability, R
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Initial and terminal PSI
Pavement Management Systems
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Pavement Performance Curves (FTE Figs 9.5 and 9.32)
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Measuring pavement roughness
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Pavement Serviceability Rating (PSR) -- experts rate pavement on 0-5 scale
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Pavement Serviceability Index (PSI) -- based on physical measurements of pavement
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International Roughness Index (IRI)
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Car-mounted Mays ride meter --> in/mi of cumulative deflections.
<165 in/mi is desirable; >256 in/mi is undesirable.
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Pavement condition indicators
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(1) Visual distresses (FTE Figs 9.33 and 9.34)
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(2) Roughness
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(3) Skid resistance
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(4) Structural capacity
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Life Cycle Cost Analysis -- Options:
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Cheap pavement, 4 cycles (failure + reconstruction)
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Expensive pavement, 1 cycle (to failure)
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Worst First startegy or
alternatives?
