NDOR is planning 2” overlays on Bridge structures & your concurrence is requested:
NDOR has existing concrete bridge railings at 29” across the deck of approx. 1000 bridges, these raise at the end of the bridge railing to 32” for the guardrail to attach at 31”. We plan to overlay these with a thin water proof membrane and a 2” asphalt overlay across the bridge.
The FHWA has a list of acceptable bridge railings
http://safety.fhwa.dot.gov/roadway_dept/policy_guide/road_hardware/barriers/bridgerailings/
Under Vertical Concrete Parapet (Open or Closed) / General [PDF 1.08 MB]; the Concrete 27” railing similar to NDORs is here. Do you concur with the below statements?
Hello Phil,
MwRSF has examined the proposed resurfacing you identified. As we understand it, the roadway will be resurfaced with a water-repelling membrane and an additional 2" of asphalt overlay. The pavement overlay would reduce the effective heights of:
In reviewing relevant research, MwRSF researchers felt that the flared distance over which the effective rail height changes is acceptable, and the 31-in. tall W-beam (e.g., MGS) end treatments are acceptable. We have some concerns with other aspects of the proposed resurfacing project. Please note below.
These concerns may be resolved using one of the following approaches, in order of recommendation.
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