TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

GRANULAR BASE FAILURES IN LOW-VOLUME ROADS IN ONTARIO, CANADA

Accession Number:

00680763

Record Type:

Component

Availability:

Find a library where document is available


Order URL: http://worldcat.org/isbn/0309060745

Abstract:

In 1990, 74% of the 196,773 km of Ontario roads was low-volume roads, and 68.5% of all roads was unpaved. For the same year in Canada, there were 825,743 km of roads, and 65% was unpaved and generally classed as low volume. This large percentage of low-volume roads is a reflection of the size of Canada and its sparse population. Gravel roads may fail due to a number of mechanisms. In this paper, only those cases are considered in which the road was constructed with aggregates that met or were predicted to meet the specifications but failed either because of unforeseen changes in the materials or because of unrecognized contaminants in the materials, which still met the specification. These cases can be divided into failures because of low permeability caused by the presence of plastic or micaceous fines, failures because of low permeability caused by the presence of bacteria and algae, and failures because of breakdown of the coarse aggregate to sand sizes. The Ministry of Transportation has recently changed the specifications for granular base course aggregate to introduce a Micro-Deval test in place of petrographic examination requirements and the Los Angeles abrasion and impact test. A maximum of 25% loss is permitted for granular base and 30% for granular subbase. In addition, there are strict grading requirements and a requirement that the materials be nonplastic and that there be less than 10% mica on the 75-micrometer sieve.

Supplemental Notes:

Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

Monograph Accession #:

00680715

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Rogers, C A
Szoke, S I
Gorman, R G

Pagination:

p. 23-32

Publication Date:

1995

Serial:

Transportation Research Board Conference Proceedings

Issue Number: 6
Publisher: Transportation Research Board
ISSN: 1073-1652

Conference:

Sixth International Conference on Low-Volume Roads

Location: Minneapolis, Minnesota
Date: 1995-6-25 to 1995-6-29
Sponsors: US Forest Service and Agricultural Marketing Service, US Department of Agriculture; Federal Highway Administration, Department of Transportation; US Bureau of Indian Affairs, Department of the Interior; and Kuwait Fund for Arab Economic Development.

ISBN:

0309060745

Media Type:

Digital/other

Features:

Figures (3) ; References (5) ; Tables (3)

Uncontrolled Terms:

Aggregate breakdown; Micro-Deval test

Geographic Terms:

Ontario (Province)

Old TRIS Terms:

Ontario (Province)

Subject Areas:

Geotechnology; Highways; I36: Aggregates

Files:

TRIS, TRB, ATRI

Created Date:

Jun 6 1995 12:00AM