The stabilizing of a subgrade with lime is described in which the in-place material was scarified and lime water slurry (30 percent mixture of lime and water to produce a 4 percent by weight treatment) delivered in a tank truck, was deposited on the roadbed by spraybar. It was road mixed into the clay at 6 in. depth. The application was controlled by measuring gallons used per road station. In order to avoid a slick produced by the slurry, a self-propelled stabilizer pumped the slurry directly from the tanker through the machine itself to be mixed directly with the clay in one operation. This latter feature also kept the mixing operation on top of the spreading so that the slurry had no time to oxidze or carbonize. The one pass operation, however, slightly slowed production. There was no metering of the slurry and the original mixture was prepared by adding pounds of lime per gallon tank capacity. Two passes of stabilizer were required to mix in the lime and to bring mixture up to optimum moisture content. The road was then sealed in for 48 hours for a cure. A plasticity index of 12 was achieved. The road was then opened for remixing and a return to optimum moisture. About three passes of the stabilizer brought the soil to a 60 percent passing the number 4 screen. A 95 percent of Proctor density was achieved. On top of the stabilized subbase a 6 in. base lift of sand and shell was placed and compacted before asphalt hot-mix surface was added.

  • Corporate Authors:

    Dun Donnelley Publishing Corporation

    222 South Riverside Plaza
    Chicago, IL  United States  60606
  • Publication Date: 1965-12

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Filing Info

  • Accession Number: 00083784
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 29 1975 12:00AM