Overlay Design Using Deflections
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Design of Overlays Based on Pavement Condition, Roughness, and Deflections
Author | : Nari K. Vaswani |
Publisher | : |
Total Pages | : 25 |
Release | : 1978 |
Genre | : Pavements |
ISBN | : |
Data collected on 111 interstate highway projects in Virginia were analyzed by multi-regression analysis and the rating coefficient for each type of distress determined. By this means, the total pavement distress and, hence, the maintenance rating of each pavement was obtained. The types of distress that were found to influence the maintenance rating were longitudinal cracking, alligator cracking, rutting pushing, raveling, and patching. Then, a method for designing the required thickness of an overlay was developed based on taking the thickness equivalency of an asphaltic concrete overlay in Virginia as equal to 0.5 (the thickness equivalency of an asphaltic concrete for new construction is 1.0) and the overlay thickness as a function of the ratio of the traffic, in terms of 18-kip (8,160 kg) equivalents, carried by the pavement before the overlay to the traffic it would carry after the overlay, depending on the durability of the asphaltic mix. This design method does not require the use of a deflection measuring device.
Flexible Pavement Overlay Design by Dynamic Deflections
Author | : Harry E. Stewart |
Publisher | : |
Total Pages | : 160 |
Release | : 1985 |
Genre | : Pavements |
ISBN | : |
This report reviews and evaluates nondestructive testing equipment currently available and used for the dynamic evaluation of pavements and the design of flexible pavement overlays. The equipment described includes Dynaflect and Road Rater steady-state deflection devices and Dynatest and Phoenix falling weight deflectometers. Information presented includes basic equipment descriptions, operational characteristics, and current prices quoted by the manufacturer or distributor. The overall goal of the study described in this report was to provide a rational means by which a specific piece of equipment could be selected for use in the development of an overlay design method in South Carolina.
Design of Overlays Based on Pavement Condition, Roughness, and Deflections
Author | : Kenneth H. McGhee |
Publisher | : |
Total Pages | : 54 |
Release | : 1982 |
Genre | : Pavements |
ISBN | : |
Changing economic conditions have led to a need for more objective means of prioritizing pavement resurfacing needs and for determining the required thickness of resurfacings. Both of these issues have been addressed in the study for which this document constitutes the final report. Earlier reports on the study were directed at the development of a pavement maintenance rating system and a tentative method for designing the thickness of overlays. The present report is divided into two parts. The first deals with field trials and verification of the pavement rating system and the second with further development of thickness design procedures. Among the major findings of the study are : 1. An objective rating system can be used to provide a common basis of comparison of pavements between various raters. 2. Methods for designing the thickness of overlays based on the volume of traffic and the existing pavement structure, or on a combination of the two, appear to be practical. Material developed in the study is being used in an inventory of Virginia interstate pavements.
Deflection Method for Designing Asphalt Concrete Overlays for Asphalt Pavements
Author | : R. Ian Kingham |
Publisher | : |
Total Pages | : 19 |
Release | : 1990 |
Genre | : Pavements, Asphalt |
ISBN | : |
Structural Overlays for Pavement Rehabilitation
Author | : California. Office of Transportation Laboratory |
Publisher | : |
Total Pages | : 32 |
Release | : 1974 |
Genre | : Pavements |
ISBN | : |