New technology-based approach to advance higher volume fly ash concrete with acceptable performance

The use of fly ash in concrete has received significant attention over recent years due to environmental concerns regarding its disposal and potential for use as a cementitious material with its ability to provide significant benefits to concrete. While fly ash content less than 25 per cent of total cementitious content is routinely used in concrete, high-volume fly ash (HVFA) concrete is not common due to perceived lower early-age strengths. The objective of this study was to demonstrate using maturity based techniques that the beneficial effects of high in-place temperature may be able to compensate for the slower rate of strength gain in HVFA concrete that is typically observed when tested under standard laboratory temperature conditions. In addition, different methods (match-cured cylinders, pullout testing) were used to estimate the early-age in-place strength of HVFA concrete to confirm the maturity predicted strengths. The results have shown that the standard and field-cured cylinder strengths underestimate the in-place concrete strength. Higher in-place temperatures due to the mass characteristics of structural elements resulted in increased early age in-place strengths, adequate for construction scheduling, as measured by match-cured cylinders, pullout testing, and the maturity approach.

Language

  • English

Media Info

  • Pagination: 218p
  • Serial:
    • Issue Number: 07-09

Subject/Index Terms

Filing Info

  • Accession Number: 01385981
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 22 2012 7:26PM