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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: Bond of Lightweight Aggregate Concrete Incorporating Condensed Silica Fume
Author(s): P. J. Robins and S. A. Austin
Publication: Special Publication
Appears on pages(s): 941-958
Keywords: bond (concrete to reinforcement); bond stress; cement
content; deformed reinforcement; lateral pressure; lightweight
aggregate concrete; plasticizers; pullout tests; reinforcing
steels; silica; stresses.
Abstract:Condensed silica fume, at up to 30% by weight, was used as a partial cement replacement in lightweight aggregate concrete. The results of round and deformed bar cube pull-out tests, with and without applied lateral stress, show that condensed silica fume increases ultimate bond strength and affects the mechanism of failure. The influence of condensed silica fume on bond stress of round bars was similar at all lateral stresses, producing a 50% increase at 20% by weight replacement of cement. For deformed bars the increase in bond strength was more pronounced at higher levels of lateral stress, producing increases approaching 70% at 20% silica fume content. The improvements in ultimate bond strength with condensed silica fume are shown to only partly result from the associated increases in compressive strength, the greater part resulting from the modified properties of the concrete matrix.
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