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State Takes a Concrete Approach to Repairing I89 Bridge. A new technique will be used on the I-89 bridge to lay down the concrete decking that will save both installation and maintance costs.
On Tuesday, construction crews poured a 10-inch slab of "high performance" concrete over a 170,000-pound web of reinforced steel on a northbound bridge on Interstate 89. Concrete decks are nothing new. But the 450-foot Montpelier span will be the first "bare deck" on a Vermont's interstate system, and state construction engineer David Hoyne says the strategy could mitigate maintenance costs over the long haul.
"The idea here is that if you can develop a concrete that holds up to Vermont's harsh conditions, then you can lower your initial costs and also the costs of longer-term maintenance," Hoyne said.
The bare-deck approach means that the Montpelier bridge won't get either a membrane or pavement sealant — two expensive components on every other bridge deck on Interstate 89.
Very cool if it works as promised.
