CORRELATION BETWEEN RESILIENT MODULUS, MOISTURE VARIATION, AND SOIL SUCTION FOR SUBGRADE SOILS

In recent years, interest in determining the influence of moisture changes on the resilient modulus (M sub R) of subgrade soils beneath a pavement has increased. This is because the 1993 AASHTO "Guide for Design of Pavement Structures" recommends using a single M sub R value. The design M sub R is expected to account for the seasonal variation in subgrade moisture content. This study was undertaken to evaluate the variation of M sub R with postcompaction moisture content and suction of selected subgrade soils in Oklahoma. A sandy soil (S-Soil) and a clayey soil (C-Soil) were used for laboratory testing. The C-Soil specimens to be subjected to wetting were prepared by a modified compaction method. The proposed method was expected to enhance the flow of water in a specimen during the wetting process. New laboratory procedures for wetting and drying of specimens were also introduced and were used to establish correlations among M sub R, moisture variation, and suction. Results indicate that M sub R-moisture content relationships for C-Soil exhibit a hysteretic behavior due to wetting and drying. A similar behavior was observed for S-Soil. The C-Soil was more susceptible than the S-Soil to moisture variation, as expected. It was also observed that changes in M sub R values and suction were influenced by the initial (compaction) moisture content.

• Record URL:
  https://doi.org/10.3141/1874-11
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=CORRELATION+BETWEEN+RESILIENT+MODULUS%2c+MOISTURE+VARIATION%2c+AND+SOIL+SUCTION+FOR+SUBGRADE+SOILS&author=N.+Khoury&author=M.+Zaman&publication_year=2004
• Availability:
  • Find a library where document is available. Order URL: http://www.trb.org/Main/Public/Blurbs/155397.aspx
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1874, Geology and Properties of Earth Materials 2004.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Khoury, N N
  • Zaman, M M
• Publication Date: 2004

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 99-107
• Monograph Title: GEOLOGY AND PROPERTIES OF EARTH MATERIALS 2004
• Serial:
  • Transportation Research Record
  • Issue Number: 1874
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Clay soils; Compaction; Correlation analysis; Laboratory tests; Modulus of resilience; Moisture content; Sandy soils; Soil suction; Soils; Subgrade (Pavements); Wetting and drying tests
• Uncontrolled Terms: Seasonal variations
• Geographic Terms: Oklahoma
• Subject Areas: Data and Information Technology; Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00983227
• Record Type: Publication
• ISBN: 0309094690
• Files: TRIS, TRB, ATRI
• Created Date: Dec 6 2004 12:00AM