In this closure to the discussion of the paper, the authors comment on durability tests, and state that the selection of the aggregates (0.5 min - 0.375 min) for testing was such that the influencing factors would be limited and the significance of the properties of the aggregate to durability may be assessed. The work tried to relate the formation conditions of laterite with performance. The deposition at lower slopes is described of a mixture of pisolitic gravel, pieces of free quartz particles and quartz particles as nucleus with a coating of sesquioxide. Short silicate analysis of the aggregate of this mixture, excluding the free quartz, will give variations in the silica/alumina ratio because free quartz and silica have the same chemical formula. Definitions based on the different properties of laterite are reviewed. Concerning the field performance of pavements, the author agrees that there are other factors such as subgrade strength, drainage conditions, and construction techniques which influence the strength of the pavement. Of such factors the strength of the aggregates has a significant influence on pavement performance. Field compaction in developing countries is discussed. The analogy of compression strength of concrete is used to explain why aggregates (0.5 in to 0.375 in) were isolated and mechanical strength conducted on them.

  • Availability:
  • Supplemental Notes:
    • Closure of Proc Paper 9375, published November 1972.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Discussers:
    • de Graft-Johnson, JWS
    • BHATIA, H S
    • Hammond, A A
  • Publication Date: 1974-8

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Filing Info

  • Accession Number: 00264688
  • Record Type: Publication
  • Report/Paper Numbers: Proc Paper 10695
  • Files: TRIS
  • Created Date: Jan 9 1975 12:00AM