United States Department of Transportation
i
Life cycle, cost, and loading characteristics of AASHO designed rigid and flexible pavements in Louisiana : final report.
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1989-02-01
[PDF-81.33 KB]
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Abstract:This report represents a study undertaken to determine the life cycle, load characteristics, and associated costs of a representative sample of the oldest rigid and flexible pavements designed in Louisiana (1963-1967) using the AASHO Guide for Design of Pavement Structures. Project selection resulted in a sampling of two classes of roads designed and constructed during this period--Interstate route jointed concrete pavements and secondary route asphaltic concrete pavements.
An index, termed the Load Rate Index, was developed to compare actual and designed rate of equivalent single-axle loading (EAL) at any point in the life of a pavement. The total EAL accumulated versus designed EAL were also compared.
The typical jointed concrete pavement (Interstate route) had not reached end of life by its 20th year (1989), having carried its design EAL. The effect of factors of safety used in the original design were removed for this analysis by relating design EAL to actual section thickness.
The typical flexible pavement (secondary route) in the sample reached end of life at 14 years. The performance of these pavements is characteristic of cracking and settlement within the cement treated bases.
Total project costs (construction plus maintenance) prior to end of life were expressed in terms of cost per mile, per EAL ($/EAL - mile) to represent pavement value or return on investment for each route class. It is concluded that expressions of pavement value to be incorporated into Louisiana's Pavement Management System should include the rate and quantity of designed load actually carried prior to end of life.
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