The first project to address this deterioration was a 2000 ft. long twin bridge on I-390. Removal and replacement of the concrete barrier was not considered a viable option, and spot repairs would have a questionable life-span.
Transpo's Visi-Barrier™ precast polymer concrete panels were specified by the DOT to retrofit the existing barrier. Because Visi-Barrier™ panels are impervious to liquids and salt, they will eliminate future deterioration due to reinforcing corrosion.
This project required 8100 linear feet of custom-made panels, manufactured in several lengths to match existing construction joints. The 2" thick 14,000 psi compressive strength panels were placed in front of existing barrier and secured with bolts thru the panel face.
Later, a flowable grout was poured between the panels and the concrete barrier. Sealand Contractors Corporation sucessfully installed up to 500 linear feet of Visi-Barrier™ per day.
Russ Guelli of Sealand said that Visi-Barrier™ "allowed them to correct large variances in the height and alignment of the old barrier structure." The result not only increases the esthetics of the bridge, but also increases night-time visibility. In addition, the bright-white surface of each new panel inhances driver visibility under inclement weather conditions.
Step-SafeÂ® in Hilton Head, SCa context sensitive application
Town of Hilton Head Island officials realized that ongoing efforts to upgrade existing pedestrian crossings to ensure compliance with the Americans with Disabilities Act's (ADA) left something to be desired. The Town maintains a 50 mile multi-use pathway system that is heavily used by the island's residents and visitors.
The bright yellow flexible surfaces being applied to the asphalt pathway approaches to road crossings were considered incompatible with the Town's efforts to emphasize natural earth-tone hues in its design practices. Since citizens and public officials complained about the intrusive "bath mats" that were being installed, the Town decided to investigate alternatives. Traffic Distributor Links (representing Transpo Industries) suggested Step-SafeÂ® Detectable Warning Tiles. The Town was impressed with the variety of colors, ease of installation, and durability afforded.
The Town's design professionals worked with a number of citizen committees to identify the chocolate brown color as preferred. In order to accommodate the ADA-required level of contrast and simplify the logistical problems associated with attempting to retrofit existing pedestrian crossings, the Town hired a contractor to replace existing asphalt on pathway approaches with pre-formed portland cement concrete to accept the inlaid Step-SafeÂ® tiles and grouting material. Coligny Circle, in the Town's most popular beach area for visitors, was identified as a suitable pilot project.
Three of the arterial streets had existing pathway crossings marked just outside the outer edge of the circle. The Town had recently designed and constructed raised median islands to serve as pedestrian refuges at the crossings, and offset the crossings by installing railings within the refuge areas in order to afford improved sight distance. The refuge islands were constructed with a light-colored oyster-shell aggregate concrete. Subsequently, existing concrete within the islands was removed and re-poured to accommodate the preferred Step-SafeÂ® tiles inlaid flush into the concrete surface.
The contractor successfully accomplished a total of twelve 4' x 8' installations in a single day to fully treat each of the three major arterial pathway crossings in both the medians and shoulders. Further, the installations were accomplished in a manner that avoided any obvious indication that the tiles had been retrofitted into previously existing concrete. Over a year later, all of the installations continue to provide the desired service, and have yet to require any maintenance. The Town is delighted with the finished product, with the ease with which the installations were made, and with the relatively low cost of the work.
It subsequently decided to identify the chocolate brown Step-SafeÂ® tiles as the preferred treatment method at pathway crossings, both for new projects and for retrofitting existing crossings. Numerous projects in upcoming months will incorporate Step-SafeÂ®. One project will widen and construct separate pathways along both sides of a portion of Matthews Drive, a heavily-traveled two-lane major collector route.
The project includes the construction of a new roundabout intersection that will afford the opportunity to construct median islands similar to those employed at Coligny Circle. Another project will be the construction of separated multi-use pathways on both sides of Pope Avenue, a multi-lane divided arterial that currently employs on-street contiguous bike lanes. The Town will install Step-SafeÂ® at each location where the new pathways will cross side streets, and for the existing arterial crossings within the project area. -Darin A. Shoemaker, P.E.
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