PROPERTIES AND POSSIBLE RECYCLING OF SOLID WASTE FROM READY-MIX CONCRETE

Due to more restrictive environmental legislation, many ready-mix concrete suppliers are often obligated to find adequate means of handling, recycling and marketing their waste solids. This paper discusses the nature, properties and possible uses of the fine fraction of the waste slurry. Chemical, physical and mechanical properties of the slurry solids are presented. The influence of addition of waste solids to mortar and concrete made with three brands of cements are examined. The effects of waste solids on compressive and tensile strength, setting time, shrinkage and sulfate expansion and workability were studied. Results indicate that the slurry waste solid has very little commentitious value, and thus it probably can not be used as a replacement for cement. This is because waste slurry solids were already substantially hydrated and they were more similar to low grade lime than portland cement. The slurry can be used at a maximum rate of about five percent by weight of cement as a replacement of sand in lower bag mixes. The use of surface active agents may eliminate many adverse effects of the slurry addition observed here.

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  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • Pistilli, M F
    • Peterson, C F
    • Shah, S P
  • Publication Date: 1975-5

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Filing Info

  • Accession Number: 00096227
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 15 1975 12:00AM