Characterization of Portland Cement Concrete with Carbon Material Admixtures

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Title: Characterization of Portland Cement Concrete with Carbon Material Admixtures

Author(s): P. Garces, L.G. Andion, G. Catala, I. De la Varga, and E. Zornoza

Publication: Special Publication

Volume: 234

Issue:

Appears on pages(s): 87-98

Keywords: carbon material; cement; reinforcing corrosion; strength

Date: 3/22/2006

Abstract:
Different types of carbonaceous materials have been added to concrete mixes and their effect on the mechanical properties and the corrosion of embedded steel have been studied. Using a constant water/cement ratio of 0.42 the flexural and compression strengths of concrete with different amounts of carbonaceous materials and different curing periods have been determined. Also, the effect of adding some amount of silica fume to the mix formulation has been considered. The addition of small quantities of carbonaceous materials to the mix produces an increase of mechanical strengths and a reduction of the concrete permeability. Due to this smaller permeability the corrosion levels of embedded steel are lower as compared to the ones in an admixture-free mix, in spite of the higher electrical conductivity of the composite.