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Title:

Development of a Tool for Determining Optimal Material Blends for Unpaved Road Wearing Courses

Accession Number:

01874084

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

Experience over more than 100 years has shown that the appropriate choice of materials used on unpaved road wearing courses is critical for ensuring good and safe performance. Despite the availability of internationally developed performance-based specifications for unpaved road wearing course materials that will meet most requirements, many road agencies continue to use empirical specifications comprising grading envelopes and plasticity index ranges that do not provide an indication of expected performance. This complicates choosing the optimal blends of more than one material to obtain a better performing unpaved road wearing course, or determining the quantities of supplemental materials and the recycling depth when converting distressed, low-volume, paved roads to an engineered unpaved road standard. This paper introduces a performance-based approach to selecting unpaved road wearing course materials and a tool for optimizing blends of materials to meet specifications. The tool can be used in manual calculations, but rapid results can be obtained by using a web-based tool. The tool can be used for new unpaved road construction, regraveling existing unpaved roads, or for converting distressed paved roads to an engineered unpaved road standard. The tool is a companion to another tool that can be used for selecting chemical treatments for unpaved roads. It should be noted that the results from the tool are dependent on accurate input values for materials and road layer thickness, and consequently project investigations and materials testing are encouraged. Estimated values are likely to give misleading outputs.

Supplemental Notes:

Stephanus Johannes Hofmeyr Louw https://orcid.org/0000-0002-1021-7110© National Academy of Sciences: Transportation Research Board 2023.

Language:

English

Authors:

Louw, Stephanus Johannes Hofmeyr

ORCID 0000-0002-1021-7110

Jones, David

ORCID 0000-0002-2938-076X

Publication Date:

2023

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Publisher: Sage Publications, Incorporated
ISSN: 0361-1981
EISSN: 2169-4052
Serial URL: http://journals.sagepub.com/home/trr

Media Type:

Web

Features:

References (14)

Subject Areas:

Highways; Maintenance and Preservation; Materials; Pavements

Files:

TRIS, TRB, ATRI

Created Date:

Feb 19 2023 3:01PM