Properties of Concrete Containing Nonground Ash and Slag as Fine Aggregate

The authors discuss experiments used to study the potential use of granulated blast-furnace slag (GBFS), furnace bottom ash (FBA), and combinations of the two as fine aggregates in concrete. Material use did not involve application of grinding, sieving, or any other preprocesses. Using a fixed water-cement ratio, concretes with natural sand replaced by GBFS, FBA, and GBFS plus FBA at 10, 20, 30, 40, and 50% were examined for compressive, flexural, and split tensile strengths. Evaluation was made on a weight dependent basis, and percentages represented the GBFS, FBA, and combinations thereof in fine aggregate. Concrete water absorption capacity and microstructure were also researched. Test results indicated that with respect to reference concrete, increasing replacement ratio showed decreasing concrete strength. Additionally, concrete strength decreased more with FBA than with GBFS. When the replacement ratio was beyond 40%, in particular, concrete strength was detrimentally affected. Depending on replacement material (either GBFS or FBA), different pore structures formed in the concrete, according to microstructure studies. The authors conclude that in new concrete, the formation of a porous concrete structure is the main reason for strength reduction. Moreover, for both replacement materials, the authors observe a water absorption capacity increase trend.

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  • English

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  • Accession Number: 01055374
  • Record Type: Publication
  • Report/Paper Numbers: 104-M44
  • Files: TRIS
  • Created Date: Aug 14 2007 10:02AM