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The Oregon Department of Transportation has used either Silica Fume or Latex Modified Concrete (LMC) to lower chloride permeability in bridge deck overlays. On this project a new project combining both silica fume and LMC was used. The overlay was completed in July of 1993. Three years later, only a few cracks had developed. Chloride permeability measurements were low but not as low as the suppliers claimed.
One unexpected result was lower friction numbers on the deck surfacing. At this time it is unclear if the reduced friction was due to the modified cement or the smaller aggregates used in the mix design. ODOT plans further testing to determine the main cause of the reduced friction.
This product was difficult to mix and place and has since been discontinued by the producer.
Oregon State Highway Division, Materials and Research Section
1990-11-01
Abstract:
Laboratory studies have shown that microsilica concrete (MC) has sufficient strength and impermeability to substitute for Latex modified concrete (LMC...
The final report presents information collected by ODOT personnel from bridge deck overlays constructed in Oregon between 1989 and 1995. Decks were pl...
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