Hydraulic demolition preserves historic bridge

Article Abstract:

Oregon began a campaign to save the rest of its bridges from the ravages of rebar corrosion after the public outcry elicited from the demolition of the Alsea Bay Bridge. This comprehensive program of corrosion preventing the Yaquina Bay Bridge is also seen as good investment. Difficulties were encountered when the upper layer had to be stripped. Jackhammer drilling posed the threat of microcracking due to the vibration of the grinder. An effective alternative used is the process of hydrodemolition, wherein jets of water broke up concrete as it cleaned reinforcing bars to very precisely measured depths.

Public works, Oregon

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Short-span bridge solutions

Article Abstract:

Attention has always been focussed on long term bridges, but short span bridges, which are in a bad condition, are usually neglected. These small bridges, 25 feet long and found in rural county areas, need care according to a US Dot survey. They are marred by age, corrosion, increasing traffic and excess loads. Buried culverts are the most significant change among many suggested changes for short span bridges. These culverts are easier to design and construct, need less finance and resist bridge deck-icing and deterioration.

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Bridge repair on the fast track

Article Abstract:

The new approach adopted by Alabama DOT to repair its interstate-highway structures, wherein inspections and repair are performed simultaneously, has replaced the traditional approach to inspections, design and construction in a sequential order in bridge-repair work. This method is versatile in repairing concrete and difficult-access bridges by saving time through better engineer-contractor relations in performing emergency and various other forms of repairs.

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