SOME FACTORS AFFECTING THE DURABILITY OF LIME-FLY ASH-AGGREGATE MIXTURES

Lime-fly ash-aggregate (LFA) mixtures have proved to be effective and economical paving materials. In certain instances, however, these materials show a tendency to deteriorate slowly with time under severe service conditions. The objective of this study was to evaluate some of the important factors believed to influence the durability of LFA mixtures and to determine whether control of these variables can produce a more durable product. Specifically, the effect of the following parameters on the durability of LFA mixes was studied: aggregate gradation, line plus fly ash content, and saturation. Strength and durability of the various mixes were evaluated by using standard procedures outlined in ASTM C593-69. Durability was determined by the weight loss exhibited by the specimens during 12 standard freeze-thaw cycles. Results indicate that (a) for maximum durability the mix should have sufficient fines (material passing No. 4 sieve) to float the coarser aggregate particles, (b) the ratio of lime plus fly ash to fine aggregate is optimum in the range of 1:4 to 1:7, (c) durability generally increase with increased curing, (d) most mixes used in current practice have insufficient fly ash for optimum mix proportions, and (e) the effect of saturation is dependent on the freezing rate and freezing conditions. The results provide background information for design of LFA mixes to give optimum performance.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 1-10
  • Monograph Title: Stabilization
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00133995
  • Record Type: Publication
  • ISBN: 0309024706
  • Files: TRIS, TRB
  • Created Date: Jul 22 1976 12:00AM