The Pennsylvania Department of Transportation awarded the Neville Island Bridge located 2 miles from Sewickley Pennsylvania. The project required replacement of all the existing expansion dams and the entire 60,000 square yard deck surface to be preserved with Type I and VES LMC. The first latex pour on the main line was on August 8, 2009 and finished fall of 2010. Neville Island Bridge was opened in 1976 and has a total length of 5300 Feet with the longest main span on this bridge of 725 feet. On a daily basis this structure carries 28,627 vehicles on average traveling at 50 miles per hour. This bridge is separated into two bridges and seven ramps combined into one, the Ohio main channel bridge and the Ohio back channel bridge.
The Fast-Track Hydrodemolition method was implemented as the perfect tool and material for this situation. The Fast-Track method combines mechanical milling with hydrodemolition and finished off with a Latex Modified Concrete Overlay. This process removes any bad or deteriorated concrete and leaves a rough surface for the new LMC overlay material to bond too.
A Very Early Strength Latex Concrete product was utilized on the weekends due to traffic constraints in thinner width areas. This product is high early strength cement which allows 3000 psi strength in 3 hours. On wider sections a Type 1 cement was utilized since two lane traffic could be maintained for extended closure periods. This rehabilitation process has been used on many bridges in the past with a great success rate and Neville Island Bridge will prove this once more.
