HPC OVERLAYS ON ROUTE 60 OVER LYNNHAVEN INLET IN VIRGINIA September 25-27,2000

摘要

Sixteen high performance concrete overlays were placed on two 28-span bridges on Route 60 over Lynnhaven Inlet, Virginia Beach, Virginia, in the spring of 1996. The construction was funded with 20 percent Virginia Department of Transportation maintenance funds and 80 percent special ISTEA Section 6005 federal funds specifically allocated to demonstrate overlay technologies. ISTEA funds were also used to evaluate the installation and condition of the overlays and to prepare an interim report and this final report. The installation included 13 different concrete mixtures, an overlay with a thickness of only 19 mm (0.75 in), and spans with and without topical treatments of two corrosion inhibitors, for a total of 16 different overlays. The overlay types are 7% silica fume (SF), 5% SF and 35% slag (S), 5% SF and 15% class F fly ash (FA), 15% latex-modified concrete (LMC), 13% SF and 15% FA, 13% SF and 15% FA placed 19 mm thick, 7% SF and Rheocrete corrosion inhibiting admixture (CIA) (RCI), 7% SF and Armatec CIA (ACI) and ACI topical treatment (A), 7% SF and ACI, 7% SF and Darex CIA (DCI) and Postrite (P) topical treatment, 7% SF and DCI, 40% S, 7% SF and shrinkage reducing admixture (CQI), 7% SF and polyolefm fibers (POP), 7% SF and steel fibers (STF), and 7% SF and polypropylene fibers (PPF). With the exception of system F, overlays were required to have a minimum thickness of 32 mm (1.25 in). Also, system E had a variable thickness that ranged from 32 mm (1.25 in) to 19 mm (0.75 in) to provide good ride quality. Overlays have performed well with the exception of the areas adjacent to most joints. Many of these areas were replaced by the original contractor and have been replaced again by the city of Virginia Beach, Virginia.