Title: Concrete Bridge-Deck Overlays Containing Silica Fume
Author(s): Celik Ozyildirim
Publication: Symposium Paper
Appears on pages(s): 1287-1302
Keywords: bonding; chlorides; concretes; curing; permeability; silica fume; plastic shrinkage; resurfacing (overlays); Construction
Summarizes the work conducted by the Virginia Department of Transportation to evaluate the characteristics of concrete containing silica fume in the overlays as a protective system to prevent the penetration of chlorides into concrete. The first three field installations of silica fume concrete overlays in Virginia are described. The practices of other states in the USA for low-permeability silica fume concretes are also compared. The results indicate that silica fume concretes can be placed successfully in thin overlays on bridge decks. These concretes can provide the low permeabilities required to prevent the penetration of chlorides and other detrimental solutions into the concrete. Adherence to good construction practices is necessary, especially for the prevention of plastic shrinkage cracking.