Sample sites of 22,404 highway engineering soil test samples, representing more than 20 years of highway soil testing throughout South Dakota, were precisely located on soil maps of the National Cooperative Soil Survey, and the test data for each sample site were identified by soil series name. Mapping was sufficiently accurate and most soil series were sufficiently unique to encompass a relatively narrow range of values for any engineering characteristic. The engineering test data include gradation, liquid limit, plasticity index, maximum density, and optimum moisture. The data were placed on computer tape, and a statistical program was written to compute minimum, maximum, mean, and standard deviation of test data, Unified Soil Classification System, old and new AASHO Soil Classification Systems, and mean and maximum California bearing ratio for each horizon of each soil series. Both the unprocessed and the statistical data have been sorted and printed out in several forms for maximum usefulness. The correlated data enable engineers to use pedological soil survey maps to accurately predict the engineering characteristics of soils along proposed highway routes, assist engineers in planning a much abbreviated and economical yet more effective drilling and testing program, indicate specific locations of possible sources of granular and select borrow materials, make possible the compilation of large-scale engineering soil maps or profiles based on any engineering characteristic, aid in route selection, right-of-way appraisal, and location of selected soil series, and give soil scientists and engineers reliable characterizations of soil series based on statistically significant sample size.

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    • Sponsored by Committee on Exploration and Classification of Earth Materials. 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:
    • Crawford, Robert A
    • Thomas, Jordan B
    • Stout Jr, Maurice
  • Conference:
  • Publication Date: 1973

Media Info

  • Media Type: Digital/other
  • Features: Figures; Tables;
  • Pagination: pp 7-13
  • Monograph Title: Soil classification
  • Serial:

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Filing Info

  • Accession Number: 00046326
  • Record Type: Publication
  • ISBN: 0309021553
  • Files: TRIS, TRB
  • Created Date: Sep 4 1974 12:00AM