Silica fume latex modified concrete bridge deck overlay : Tualatin River Bridge #1417N : final report.

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.

US Transportation Collection