STP599

    Scalping and Replacement Effects on the Compaction Characteristics of Earth-Rock Mixtures

    Published: Jan 1976


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    Abstract

    This investigation examines the validity of a scalping and replacement procedure used by many laboratories to determine compaction characteristics of earth-rock mixtures containing oversized particles. Two commonly used methods of computing densities of full-sized specimens, based upon results from tests performed on minus No. 4 fractions of the actual total sample, were examined. Compaction tests were performed on full-scale and scalped and replaced specimens, in which both gravel and fines content were varied. The test results indicate that the scalping and replacement procedure results in significantly lower maximum dry unit weights and higher optimum water content than are obtained for full-scale specimens. The use of the theoretical methods provided better approximations of experimental results on full-scale specimens having gravel contents up to 70 percent than did the relationships developed using the scalping and replacement procedure. For gravel contents above 70 percent, better approximations were obtained using the scalping and replacement procedure.

    Keywords:

    soils, compaction, density, moisture content, earth-rock mixtures


    Author Information:

    Donaghe, RT
    U.S. Army civil engineering technician and research engineer, Soils Research Facility, Waterways Experiment Station, Vicksburg, Miss.

    Townsend, FC
    U.S. Army civil engineering technician and research engineer, Soils Research Facility, Waterways Experiment Station, Vicksburg, Miss.


    Paper ID: STP39087S

    Committee/Subcommittee: D18.20

    DOI: 10.1520/STP39087S


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