Evaluation of Procedure to Assign Structural Layer Coefficients for Use in Flexible Pavement Design

Evaluation of Procedure to Assign Structural Layer Coefficients for Use in Flexible Pavement Design
Author: Harold L. Von Quintus
Publisher:
Total Pages: 38
Release: 2007
Genre: Pavements, Asphalt
ISBN:
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The Kansas Department of Transportation (DOT) uses the 1993 DARWin version of the 1986 AASHTO Guide to design flexible pavements and rehabilitation strategies of flexible pavements. One of the inputs needed for the flexible pavement design procedure is the structural layer coefficient for each pavement layer. The Kansas DOT procedure to assign structural layer coefficients was developed years ago and based on an analysis of flexible pavement performance data and layer properties. It has been recently suggested that the Kansas DOT increase the structural layer coefficients because of changes in material and construction specifications. Different procedures can be used to estimate the structural layer coefficients for flexible pavement design. As part of the study entitled Determination of the Appropriate Use of Pavement Surface History in the KDOT Life-Cycle Cost Analysis Process an evaluation of the procedure that Kansas DOT uses to assign structural layer coefficients to different pavement materials was completed. This report provides the results of that evaluation.

Design Pamphlet for the Determination of Layered Elastic Moduli for Flexible Pavement Design in Support of the 1993 AASHTO Guide for the Design of Pavement Structures

Design Pamphlet for the Determination of Layered Elastic Moduli for Flexible Pavement Design in Support of the 1993 AASHTO Guide for the Design of Pavement Structures
Author: Harold L. Von Quintus
Publisher:
Total Pages: 34
Release: 1997
Genre: Pavements
ISBN:
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This design pamphlet details suggested procedures to determine the design resilient modulus of different pavement materials in support of the 1993 American Association of State Highway and Transportation Officials (AASHTO) Guide for the Design of Pavement Structures. These suggested procedures do consider the seasonal variation of resilient moduli to estimate structural layer coefficients for flexible pavement design.

AASHTO Guide for Design of Pavement Structures, 1993

AASHTO Guide for Design of Pavement Structures, 1993
Author: American Association of State Highway and Transportation Officials
Publisher: AASHTO
Total Pages: 622
Release: 1993
Genre: Pavements
ISBN: 1560510552
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Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.

A Structural Material Model for Granular Bases

A Structural Material Model for Granular Bases
Author:
Publisher:
Total Pages:
Release: 1997
Genre:
ISBN:
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Techniques typically used in mechanistic analyses to characterize the behavior of unbound granular materials in a flexible pavement often predict stress conditions exceeding the material's static strength. Some pavement analysis tools such as ILLI-PAVE attempt to adjust predicted stresses in unbound layers so that they do not violate the Mohr-Coulomb failure envelope. However, the adjusted stresses are used only to calculate the resilient modulus to be used in the next iteration of the model, resulting in final stresses that are questionable and that frequently exceed the material's strength. Laboratory resilient modulus tests were conducted on granular at stress states exceeding the material's static shear strengths. Based on the data obtained, a material model for unbound granular material was developed that is a modification of the commonly used k-theta-n model for unbound granular materials. In addition, an advantage of the modified model is the ability to analyze the structural effects of granular materials having different shear strength characteristics. For the covering abstract of this conference see IRRD number 872978.