The chemical nature of lime is explained, the chemical reactions it produces with natural highway construction materials are described, and its used are examined. The lime stabilization of soils, the formation of subbase material from clayey soils, and use of hydrated lime in subbase, base course aggregates and asphalt and asphalt paving mixtures are reviewed. The need for an additive to asphalt may be determined by the Immersion-Compression test results. Various means are listed whereby the water resistance of compacted asphalt mixtures may be improved when tests show that the Wet/Dry Stability Ratio criteria has not been met. Laboratory test data are presented from actual construction projects. In the first project, the desired improvement in stripping resistance was obtained by adding hydrated lime to the aggregate and heating it immediately to mixing temperature. No curing period was required. Test results showed a marked increase in Wet/Dry Stability Ratio with the addition of 1 percent hydrated lime and the increase of 0.5 percent in asphalt content. Similar results were obtained in further projects. The addition of 1 percent hydrated lime adds about 30 cents to the cost of a ton of asphalt mix, and is equivalent to the cost of hauling a ton of aggregate 4 miles.

  • Corporate Authors:

    Colorado Department of Highways

    4201 East Arkansas Avenue
    Denver, CO  United States  80222
  • Authors:
    • Lowrie, C R
  • Publication Date: 1964-2-20

Media Info

  • Pagination: p. 1-13

Subject/Index Terms

Filing Info

  • Accession Number: 00083792
  • Record Type: Publication
  • Created Date: May 29 1975 12:00AM