FROST SUSCEPTIBILITY OF RECYCLED AGGREGATE

This paper discusses frost heave experiments carried out on crushed concrete, demolition debris, and limestone as aggregate for use in subbase and capping layers. This was part of research carried out to examine the ability of recycled aggregates to match the performance of natural aggregates with respect to the requirements of unbound aggregates for use in subbase and capping layers. The experiments involved placing compacted specimens of aggregate in a chamber with the lower ends of the specimens in indirect contact with water by means of a porous disc. Test conditions are discussed for all three materials focussing on moisture content and density values. Test results showed a strong relationship between moisture content and frost heave for the crushed concrete samples. It was therefore classed as highly susceptible to frost. Limestone was classed as not frost susceptible, whereas demolition debris needed further testing at other laboratories to confirm its frost susceptibility. Although the frost heave of crushed concrete appeared to be directly influenced by the initial moisture content of the specimens, the increase in volume of the material due to the expansion of this water on freezing was found to be relatively insignificant. For the covering abstract of the conference see IRRD 869363.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 889-96

Subject/Index Terms

Filing Info

  • Accession Number: 00675816
  • Record Type: Publication
  • Source Agency: DIENST WEG- EN WATERBOUWKUNDE (DWW)
  • ISBN: 0-444-81853-7
  • Files: ITRD
  • Created Date: Apr 12 1995 12:00AM