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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Influence of Residual Carbon in Fly Ash on Microstructure and Strength Development of Mortars and Concretes
Author(s): H. Hornain, F. L. Miersman, and J. Marchand
Publication: Special Publication
Appears on pages(s): 21-36
Keywords: carbon; compressive strength; flexural strength; fly ash; microstructure; porosity; scanning electron microscope; strength; Materials Research
Abstract:Effect of residual carbon content in fly ash on the hardened cement paste properties was investigated. Mortars and concretes were prepared with three different aluminosilicate-type fly ashes of the same mineralogical composition but containing, respectively, 5, 7, and 12 percent of residual carbon. Mixtures containing 15 and 30 percent of fly ash, as replacement of cement, were studied. The microstructure was studied by means of SEM observations and EDS analysis. Pore-size distributions were determined by mercury intrusion porosimetry. Compressive and flexural strengths were measured after 2, 7, 28, and 90 days. Results indicate that the residual carbon content in fly ash does not have any detrimental influence on the microstructure and on the mechanical strength development even at the highest carbon content.
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