EFFECT OF MOISTURE ON THE STRUCTURAL PERFORMANCE OF A CRUSHED-LIMESTONE ROAD BASE

A series of repeated load triaxial tests on a crushed-rock aggregate is described, including variations in grading and degree of compaction as well as moisture content. The effects of these variables are discussed and it is found that elastic stiffness tends to decrease slightly with increased moisture content for broadly graded materials. The influence of density is negligible, and that of grading minor, which results in some stiffness reduction as the fines content increases. The accumulation of permanent strain under multicycle loading is found to be strongly dependent on density; denser material performs better. Grading has a minor effect. Increased moisture content results in substantially increased straining. The value of suction, which could exist in a granular material, is then explored indirectly by means of unconfined compression tests, and its effect on drainage is noted. Permeability measurements are given and their possible effect on drainage considered. Finally, computations are presented that illustrate the influence of partial and full saturation of a base layer of a pavement structure.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1987/1121/1121-008.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=EFFECT+OF+MOISTURE+ON+THE+STRUCTURAL+PERFORMANCE+OF+A+CRUSHED-LIMESTONE+ROAD+BASE&author=N.+Thom&author=S.+BROWN&publication_year=1987
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309045010
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Strength and Deformation Characteristics of Pavement Sections. 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:
  • Thom, N H
  • BROWN, S F
• Conference:
  • 66th Annual Meeting of the Transportation Board
  • Location: Washington District of Columbia, United States
  • Date: 1987-1-12 to 1987-1-15
• Publication Date: 1987

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 50-56
• Monograph Title: Effects of temperature and water on pavement performance
• Serial:
  • Transportation Research Record
  • Issue Number: 1121
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Accelerated tests; Aggregate gradation; Base course (Pavements); Calculation; Compaction; Crushed limestone; Density; Drainage; Fines (Materials); Moisture content; Percent saturation; Permeability; Repeated loads; Soil suction; Stiffness; Strain (Mechanics); Triaxial shear tests
• Uncontrolled Terms: Computation; Suction
• Old TRIS Terms: Strains; Unconfined compression tests
• Subject Areas: Design; Highways; Hydraulics and Hydrology; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00468688
• Record Type: Publication
• ISBN: 0309045010
• Files: TRIS, TRB, ATRI
• Created Date: May 31 1988 12:00AM