Stainless Steel Rebar Re-bending at the same location
Stainless Steel Rebar Re-bending at the same location
(OP)
Will the stainless steel rebars used for bridge deck weaken when it is bent at a location? The second part of the question is what will happen if the bent stainless steel rebar bent again at the same location? I have a situation where the contractor wants to bend the SS rebar 90 degrees in a stage construction of the bridge due to limited space between the existing portion of existing structure and want to bend it back to a straight line in the next stage when the existing structure is demolished, so that he can use this portion of rebar for lapping in a closure pour. Any answers will be appreciated.






RE: Stainless Steel Rebar Re-bending at the same location
RE: Stainless Steel Rebar Re-bending at the same location
RE: Stainless Steel Rebar Re-bending at the same location
Field bending should be avoided, and the preferred method would be couplers. That said, #3, #4, and #5 can be field bent if absolutely necessary. As with all rebar, they may be bent and straightened in the same length one time only. Stainless bar does have a very high ductility as rebar goes, but the high yield strength also means it is very difficult to bend by hand or using hand tools. Do not use carbon steel tools to bend of straighten stainless, as doing so embeds small particles of carbon, resulting in focal points for corrosion. It may also be necessary for the surface to be passivated with pickling paste after bending/straightening, depending on the type of stainless.
Do not allow both the bending and straightening to be done in the field by hand. Field bending typically results in too-tight of bend radius and this is the mechanism where the bar is weakened or fractured outright. Place shop-fabricated bar, then straighten as the staging permits, avoiding kinks and tight radius re-bends. The loss of strength should be nil to minimal.
CRSI has a free tech note on stainless reinforcement on the website at crsi.org
RE: Stainless Steel Rebar Re-bending at the same location
Our staging doesn't allow for closure pours,not enough room, all transverse bars will be coupled.
I wasn't aware of the restriction on carbon tools. We anticipate quite a bit of field fabrication due to the construction staging and bridge geometry.
Thanks again.
RE: Stainless Steel Rebar Re-bending at the same location
John Turner CSP PE
CRSI Greater Southwestern Regional Manager
RE: Stainless Steel Rebar Re-bending at the same location
RE: Stainless Steel Rebar Re-bending at the same location