Evaluation of fly ash in lean Portland Cement Concrete base "Econocrete".
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Evaluation of fly ash in lean Portland Cement Concrete base "Econocrete".

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  • English

  • Details:

    • Alternative Title:
      Evaluation of fly ash in lean Portland Cement Concrete base Econocrete
    • Resource Type:
    • Geographical Coverage:
    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ; NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance ;
    • Abstract:
      Fly ash was used in this evaluation study to replace 30, 50 and 70

      percent of the 400 1bs. of cement currently used in each cu. yd. of

      portland cement econocrete base paving mix.

      Two Class "c" ashes and one Class "F" ash from Iowa approved sources

      were examined in each mix. When Class "c" ashes were used, they were

      substituted on the basis of 1.0 pound for each pound of cement removed.

      When Class "F" ash was used, it was substituted on the basis

      of 1.25 pounds of ash for each pound of cement removed.

      Compressive strengths with and without fly ash were determined at 7,

      28 and 56 days of age. In most cases, strengths were adequate.

      The freeze/thaw durability of the econocrete mixes studied was not adversely

      affected by the presence of fly ash.

      The tests along with erodibility and absorption tests have demonstrated

      the feasibility of producing econocrete with satisfactory mechanical

      properties even when relatively low quality and/or locally

      available aggregate is being used at no sacrifice to strength and/or

      durability.

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