This is a study of the effect of condensed silica fume (CSF) on the mechanical behavior of the steel-concrete bond, and on the microstructure of the steel-cement paste transition zone. The mechanical behavior of the steel-cement was studied by using the pullout test on concrete of varying compressive strength, and varying contents of CSF. Increased additions of CSF up to 16 % by weight of cement showed an improving effect on the pullout strength, especially in the high compressive strength range of the concrete. The presence of CSF affected the morpohology and microstructure of the steel-cement paste transition zone. Thus, both porosity and thicknes of the transition zone were reduced. The observed effect of CSF maybe explained by several mechanisms: reduced accumulation of free water at the interface during castng of the specimens; reduced preferential orientation of the CH crystals at the steel-paste transition zone; and densification of the transition zone due to pozzolanic reaction between CH and CSF.

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  • Accession Number: 00602976
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 31 1990 12:00AM