USE OF CEMENT-KILN DUST AND FLY ASH IN POZZOLANIC CONCRETE BASE COURSES

The results of a study to determine the usefulness, as stabilized base, of pozzolanic concrete that contains cement-kiln dust (CKD) and fly ash are reported. Test strips of six different mixes of pozzolanic concrete that contained CKD and fly ash as the cementitious ingredients and crushed limestone as the aggregate were constructed on a concrete plant drive at Silica, Ohio. Deflection measurements, monitoring of axle-load accumulations, and periodic compression tests of field samples were preformed. Laboratory test cylinders were also prepared and tested. After 25,820 equivalent 80-kN (18,000-lbf) single-axle loads over six months, no cracking or surface damage was visible except in a localized area. Deflection was found to decrease as curing time for the test strips increased. A set of regression equations was developed for predicting laboratory compressive strengths as a function of CKD content, curing temperature, and curing time in weeks. Application of these equations to field conditions resulted in reasonable predicted, as compared with observed, field strenghts in most cases. Pozzolanic concrete containing CKD and fly ash as cementitious ingredients was found to have the property of autogenous healing. Anomalies were found in mixes that contained admixtures of portland cement. More study of the behavior of such mixes is needed. It is concluded that pozzolanic concrete that contains CKD and fly ash is potentially useful as stabilized base and merits further development. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; Tables;
  • Pagination: pp 36-41
  • Monograph Title: Emulsion mix design, stabilization and compaction
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00323004
  • Record Type: Publication
  • ISBN: 0309030676
  • Files: TRIS, TRB
  • Created Date: Apr 15 1981 12:00AM