THE USE OF BY-PRODUCTS IN CONCRETE

An outline is given of the approach to utilisation of waste materials in the construction industry, the problems involved and the prospects and trends envisaged. The construction industry which requires large quantities of low cost raw materials has for long provided potential outlets for industrial by-products and waste materials. Some materials in this category, for instance blast furnace slag, make a useful contribution to the supply of road-stone and aggregates for concrete. Other materials, available in large quantities both in spoil heaps and in annual production, are however little used. Examples are provided by colliery spoil and China clay waste. The problems involved in achieving utilisation lie not only in technical suitability but also in economics. Waste materials are often of variable composition and may contain minor components, such as sulphate, which are deleterious in concrete. Technical evaluation of the waste materials involves chemical and mineralogical analysis, identification of possible uses, and establishing of standards to protect the user. Durability of concrete containing the by-product must be assessed. The waste material may be used as it occurs or may be heat-treated to obtain a product of preselected properties. Correlation or microstructure with properties of practical importance may lead to special products. The solution of technical problems alone will not, however, achieve utilisation. To be used, the waste material needs to be competitive in price, and available in those areas of the country where there is a need to supplement existing cement or aggregate materials. Since concentrations of spoil heaps often occur in areas distant from those where construction activity is greatest, the cost of transport plays a large part in the prospects for utilisation. These issues are discussed in the context of materials for concrete.(a) this paper was presented at the conference on the conservation of materials, harwell, March 26 and 27th, 1974. (TRRL)

  • Corporate Authors:

    Building Research Establishment

    Building Research Station, Garston
    Watford WD2 7JR, Hertsford,   England 
  • Authors:
    • Gutt, W
  • Publication Date: 1974-5

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 19 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00334842
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: CP 53/74 Monograph
  • Files: ITRD, TRIS
  • Created Date: Sep 16 1981 12:00AM