OCCURRENCE AND TESTING FOR DELETERIOUS SALTS IN ROAD CONSTRUCTION MATERIALS WITH PARTICULAR REFERENCE TO CALCRETES

The types of soluble salts present in road construction materials are reviewed and it is concluded that sodium chloride, sodium sulfate, sodium carbonate, magnesium sulfate and calcium sulfate are likely to be the deliterious salts most commonly encountered. Simple conductivity methods are suggested for the routine checking of soils, crushed rocks and waters for use in road construction in arid and semi-arid areas. It is further concluded that calcretes should always be tested for soluble salts before use as a base course, binder, sub-base, premix filler or surfacing chips. A procedure combining a simple conductivity measurement and simple qualitative test for sulfate is probably adequate for the routine field and central laboratory checking of soils, waters and crushed rocks for road construction. Lastly, limits on the salt content of a completed base must allow for the upward migration and concentration of salts below the surfacing.

  • Supplemental Notes:
    • This report was reprinted from the Proceedings of the Symposium on Soils and Earth Structures in Arid Climates, Adelaide, Australia, May 21-22, 1970, pages 87-92.
  • Corporate Authors:

    National Institute for Transport & Rd Res S Af

    P.O. Box 395
    Pretoria 0001, Transvaal,   South Africa 
  • Authors:
    • NETTERBERG, F
  • Publication Date: 1970-5

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00167474
  • Record Type: Publication
  • Report/Paper Numbers: Res. Rpt. 114 Proceeding
  • Files: TRIS
  • Created Date: May 3 1978 12:00AM