The author gives an outline of the sources and resources of synthetic (and other artificial) aggregates used in concrete in Great Britain. The article is primarily concerned with the production of synthetic aggregates. The author discusses the classification of aggregates and particularly the value of using density for primary classification. It is pointed out that whilst the loose bulk density is used for this purpose for light-weight aggregate classification, compacted density is used elsewhere. The need for testing a single size fraction is stressed. The next part of the article is concerned with synthetic aggregates produced as a by-product of other processes, and the production, nature and uses of furnace clinker, furnace bottom ash, air-cooled blast furnace slag, foamed slag, steel slag and incinerated refuse clinker are outlined. Details are given of the synthesis of aggregate by heat treatment and follows this by describing the raw materials that may be used for this purpose (colliery wastes, pulverised fuel ash, natural clays and slates), the processes used and the materials that are currently produced in this way (including leca and solite). Attention is drawn to the value of using a bulk density (loose) of 1000kg/cubic metre as a division between lightweight and denser aggregates; likely demand is discussed and colliery shale and pfa are quoted as being the likely sources of material to replace dwindling supplies of furnace clinker which is at present being augmented by the importation of about 0.3 million cubic metres of pumice annually. /TRRL/

  • Availability:
  • Corporate Authors:

    Cement and Concrete Association

    52 Grosvenor Gardens
    London SW1W 0AQ,   England 
  • Authors:
    • Harrison, W H
  • Publication Date: 1974-11

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 41-44
  • Serial:
    • Volume: 8
    • Issue Number: 11
    • ISSN: 0010-5317

Subject/Index Terms

Filing Info

  • Accession Number: 00096785
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 15 1975 12:00AM