This research project forms part of a continuing line of activity investigating the rheological, constructional and structural characteristics of lightweight concrete. The immediate object was a feasibility study into the use of waste polystyrene chips alone, or in conjunction with another waste material which had been commercially processed, or in conjunction with natural sand, as a lightweight concrete for structural units, precast blocks, or infill material. The behaviour of these three sets of mixes was compared with a reference mix using natural materials for both the fine and coarse aggregate fractions. A wide range of aggregate concentrations was considered using a constant workability throughout determined by visual examination. The influence of type of aggregate and aggregate concentration on the fresh, stiffening and set concrete was then examined. The limitations of the standard workability tests when applied to lightweight mixes were illustrated. A newly developed vane test was used to study the stiffening characteristics of the different sets of mixes via internal resistance. This was coupled with a recording of the rate of early strength development of crushing strength. The physical properties of the hardened concrete were examined and compared using standard testing procedures for cube crushing strength, elastic modulus initial shrinkage and moisture movement. An indication of durability was also determined using an ad hoc freezing and thawing test. The investigation illustrated the problems and potential of waste material utilisation in general and polystyrene chips in particular either alone or in conjunction with lightweight or natural fines.(a) the number of the covering abstract of the conference is IRRD abstract no. 213776 /TRRL/

  • Supplemental Notes:
    • Presented at the First Australian Conference on Engineering Materials.
  • Corporate Authors:

    University of New South Wales

    School of Civil Engineering, Anzac Parade
    Kensington, New South Wales  Australia  2033
  • Authors:
    • Ritchie, AGB
    • Tingari, M B
  • Publication Date: 0


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 9 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00129549
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: ITRD, TRIS
  • Created Date: May 14 1976 12:00AM