HOW AGGREGATES AFFECT CONCRETE QUALITY

The article describes the effects of sand and gravel compositions on the quality of placed concrete. Types of reactive rock present in a gravel deposit can affect the performance of a concrete mix by causing expansion cracking or shrinkage. It has been suggested that this reactivity is not only related to composition but to the percentage of strained quartz in a rock. Sands are used in building applications to provide bulk for mortar and cement materials and to reduce the void space created by coarse aggregate. Sands should not contain significant amounts of silt and clay (less than 3% by weight) to reduce water absorption. It is emphasized that correct grading and blending of sand is an important influence on concrete quality. /TRRL/

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  • Corporate Authors:

    Morgan-Grampian (Professional Press) Limited

    Morgan-Grampian House, Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • BELL, F G
  • Publication Date: 1977-8

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00177371
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 27 1978 12:00AM