MEASUREMENT OF WEAR ON GRAVEL ROADS

THIS STUDY WAS MADE TO DETERMINE THE LOSS OF SURFACING MATERIAL FORM UNTREATED TRAFFIC-BOUND ROADS AND ROAD SURFACES THAT HAVE BEEN STABILIZED BY THE ADDITION OF BINDER-SOIL AND CALCIUM CHLORIDE. THE SCOPE OF THE WORK INVOLVED NOT ONLY THE MEASUREMENT OF WEAR BUT STUDIES OF SURFACE DENSITY, MOISTURE CONTENT, RECORD OF TREATMENT, CHEMICAL CONTENT AND GRADATION OF MATERIALS. TO GUARD AGAINST A GENERAL SHIFT OF FOUNDATION, LEVEL MEASUREMENTS WERE TAKEN TO PLATES BURIED BENEATH THE ROADWAY. IN TAKING THE LAST READINGS ON THE STABILIZED AND TREATED SURFACES, THEY WERE SWEPT AND THE WEIGHT OF LOOSE MATERIAL PER MILE DETERMINED. THESE SURFACES CARRIED NO LOOSE MATERIAL WHEN FIRST CONSTRUCTED. THE PROCEDURE IN TAKING WEAR MEASUREMENTS CONSISTED OF READING A LEVEL ROD TO AN ACCURACY OF 0.01 FT. ON EACH FOOT OF A CROSS SECTION OF THE MAINTAINED ROADWAY. APPROXIMATELY 100,000 LEVEL READINGS WERE MADE. THE AVERAGE DAILY TRAFFIC ON THE FIVE PROJECT STUDIED WAS 395 VEHICLES. THE ANNUAL MATERIAL LOSS FROM THE STABILIZED SECTIONS, TREATED WITH CALCIUM CHLORIDE, WAS 37 PER CENT OF THE AMOUNT LOST FROM THE UNTREATED UNSTABILIZED SECTIONS. THE SECTIONS TREATED WITH CALCIUM CHLORIDE WITHOUT PRELIMINARY STABILIZING WITH BINDER-SOIL LOST 49 PER CENT AS MUCH AS THE UNTREATED SECTIONS. THE RESULTS DO NOT INDICATE THAT THE LOSSES ARE PROPORTIONAL TO THE AMOUNT OF TRAFFIC. VARIABLES WHICH AFFECT THIS ARE CONSIDERED IN DETAIL IN THE REPORT. READINGS ON THE BURIED PLATES SHOWED THAT AS MUCH AS ONE-THIRD OF THE REDUCTION IN ROAD SURFACE ELEVATION CONSISTED OF AN APPARENT SINKING OF THE ENTIRE ROAD-BED, PROBABLY DUE TO DOWNWARD AND OUTWARD PLASTIC FLOW OF THE SUBGRADE. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/18/18Part1-029.pdf
• Supplemental Notes:
  • Vol 18, Pt 1, PP 323-328, 5 FIG, 1 TAB. 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.
• Authors:
  • Swinton, R S
• Publication Date: 1939

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Eighteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. November 28-December 2, 1938. Part I
• Serial:
  • Highway Research Board Proceedings
  • Volume: 18
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregate gradation; Chemical composition; Gravel roads; Measurement; Soil water; Subgrade (Pavements); Surfacing; Texture; Traffic; Wear
• Old TRIS Terms: Gradation; Subgrade surface
• Subject Areas: Highways; Operations and Traffic Management; Pavements;

Filing Info

• Accession Number: 00207181
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jun 1 1971 12:00AM