A glacial silty clay, previously studied in the laboratory, was compacted in a field test pad to determine what variables control density and strength and their variabilities. Correlation was attempted to provide a prediction process for the field result. Additionally, a procedure was identified by which quality assurance and design engineers can interpret and write compaction specifications that insure a desired field strength. Strength is controlled by water content, desity, and compactive effort. Dry density is controlled by water content, compactive effort, and the interaction between them. The quantitative influence of each constituent variable varied with type of equipment. Variabilities of both density and strength are significant. Predictions are possible if the magnitude and a range in magnitude of each constituent variable are known. Control of the compaction process and good soil homogeneity reduce the variabilities. A procedure is presented for this soil which developes a computer tabulation of the variables to allow an estimate of field compacted strength knowing inspection test results. Also developed is a procedure to allow the design engineer to directly determine his compaction specificaiton to insure a desired strenght and its variability. /FHWA/

  • Supplemental Notes:
    • Sponored by the Indiana State Highway Commission. Prepared in cooperation with the Department of Transportation, Federal Highway Administration. From research study entitled Improving Embankment Design and Performance.
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Price, J T
  • Publication Date: 1978-6-1

Media Info

  • Pagination: 151 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188976
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: JHRP-78-7 Intrm Rpt.
  • Contract Numbers: 1(15) Part II
  • Files: TRIS, ATRI, USDOT
  • Created Date: Apr 12 1979 12:00AM