Development of an Improved Overlay Design Procedure for the State of Alaska. Volume II: Final Report

Yapp, M.; Hicks, R. G.; Connor, Billy; Alaska. Dept. of Transportation and Public Facilities

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Development of an Improved Overlay Design Procedure for the State of Alaska. Volume II: Final Report

1987-10-01
By Yapp, M. ; Hicks, R. G. ; Connor, Billy

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English

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Creators:

Yapp, M. ; Hicks, R. G. ; Connor, Billy

Yapp, M. ; Hicks, R. G. ; Connor, Billy Less -
Corporate Creators:

Alaska. Dept. of Transportation and Public Facilities
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Backcalculation Data And Information Technology Design Design Methods Equations Flexible Pavements Frigid Regions Highways I22: Design Of Pavements, Railways And Guideways Overlays (Pavements) Pavements
Publication/ Report Number:

FHWA-AK-RD-88-06 ,TRR 87-15
Resource Type:

Research Paper
Geographical Coverage:

Alaska ; United States

Alaska ; United States Less -
TRIS Online Accession Number:

00488295
Edition:

Final Report
Corporate Publisher:

Alaska. Dept. of Transportation and Public Facilities
Abstract:

The state of Alaska is currently developing a pavement management system for their road system. An important input to the system is the determination of flexible overlays based on the structural adequacy of the existing pavement. The current overlay procedure (the Asphalt Institute method) does not always show a need for overlays, despite the poor surface condition of the pavement and high traffic volumes. Therefore, an improved procedure that would consider not only traffic but also surface distress, the structural properties of the pavement, and, most importantly, the effects of a freezing and thawing of the base, subbase, and subgrade layers are needed. This report recommends two such methods for further consideration: a simplified mechanistic method using equations developed in Pennsylvania, and a mechanistic procedure employing a backcalculation computer program known as ELSDEF. The results of these analyses are compared with those of the Alphalt Institute procedure. It was determined that the Asphalt Institute procedure was inappropriate and underdesigned the overlay for the road sections. The Pennsylvania equations tended to be slightly more conservative than the mechanistic method using ELSDEF except for cases where the pavement fatigue life had been utilized completely by past traffic loads. It is recommended that Alaska utilize the mechanistic approach to design overlays and ELSDEF as the backcalculation procedure. The Pennsylvania equations can be used in those cases not requiring considerable accuracy.
Format:

PDF
Collection(s):

US Transportation Collection
Main Document Checksum:

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urn:sha256:8fa8051247000510cb35651d500db7aa03506f540d9fbd3f7be1b25e8889cfd0
Download URL:

https://rosap.ntl.bts.gov/view/dot/40628/dot_40628_DS1.pdf
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Development of an Improved Overlay Design Procedure for the State of Alaska. Volume II: Final Report

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