CALIFORNIA BEARING RATIO IMPROVEMENT OF REMOLDED SOILS BY THE ADDITION OF POLYPROPYLENE FIBER REINFORCEMENT

The California bearing ratio (CBR) of a micaceous silt, common to the Piedmont in the southeastern United States, was significantly enhanced by the addition of discrete polypropylene fiber reinforcement. Dosages of fiber ranging from 0.09 to 1.5% of the soil's dry unit weight were used in soil compacted to 100% of its standard Proctor maximum dry density. Fiber configurations consisted of monofilament fiber of 0.38- and 0.76-mm diameter as well as an equivalent fibrillated fiber of 0.38-mm diameter, a lattice-work comprising smaller-diameter webs and stems. Fiber lengths were 19 and 25 mm. The addition of fiber increased the CBR values 65 to 133% over unreinforced specimens, depending on fiber configuration and dosage. CBR values using 25-mm-long, 0.76-mm monofilament fiber reinforcement increased significantly up to a dosage of 1%, then began to decrease. The test results indicated that there is an optimum fiber dosage as well as an optimum configuration for improving a compacted soil's CBR value.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1991/1295/1295-010.pdf
• Record URL:
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• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1295, Soil Stabilization 1991. 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:
  • Fletcher, C Scott
  • Humphries, W Kenneth
• Publication Date: 1991

Media Info

• Features: References; Tables;
• Pagination: p. 80-86
• Monograph Title: Soil stabilization, 1991
• Serial:
  • Transportation Research Record
  • Issue Number: 1295
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: California bearing ratio; Fibers; Laboratory tests; Material reinforcement; Micaceous soils; Optimization; Polypropylene; Remolded soils; Silts
• Old TRIS Terms: Remolded soil samples
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00611903
• Record Type: Publication
• ISBN: 030905074X
• Files: TRIS, TRB
• Created Date: Aug 31 1991 12:00AM