ON THE MERITS OF FLY ASH ADDITIONS TO CONCRETE FOR REDUCING MICROSTRUCTURAL DETERIORATION DUE TO FATIGUE . PROTECTION OF CONCRETE. PROCEEDINGS OF THE INTERNATIONAL CONFERENCE HELD AT THE UNIVERSITY OF DUNDEE, SEPTEMBER 11-13, 1990

It is acknowledged that concrete exhibits fatigue in the form of microcracking degradation, however the understanding of the long term response of concrete to fatigue is still not fully developed. One of the techniques used to improve concrete performance, including durability, is the addition of fly ash as a partial cement replacement. However the effect of fly ash on the fatigue behaviour of concrete as well as the mechanisms of any such effects are not well understood. This paper reports on the results of a comparative research program aimed at evaluating the relative fatigue response of mortars containing varying amounts of fly ash. The approach has been to use the double torsion specimen to provide data for the plotting of fatigue crack velocity - stress intensity (V-K) curves. The results suggest that fly ash mortar is slightly worse than OPC mortars in resisting fatigue microcrack degradation, but there are some hydration age effects. Scanning electron microscope micrographs of a 25% fly ash mortar also suggest that the extent of hydration of fly ash particles after seven days is limited, and this may elucidate some of the observed fatigue effects of fly ash in concrete with time. (Author/TRRL)

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  • Corporate Authors:

    E and F Spon Limited

    2-6 Boundary Road
    London,   England 
  • Authors:
    • Taylor, P C
    • Tait, R B
  • Publication Date: 1990

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Filing Info

  • Accession Number: 00620038
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: O-419-15490-6
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1992 12:00AM