HDG Reinf in contact with Black Reinf
HDG Reinf in contact with Black Reinf
(OP)
Does anyone have any information on the use of HDG reinforcing in contact with non-coated bars?
This is related to bridge deck bottom reinforcing.
Dik
This is related to bridge deck bottom reinforcing.
Dik






RE: HDG Reinf in contact with Black Reinf
This reference is applicable. Read what it says in about the 8th paragraph.
htt
RE: HDG Reinf in contact with Black Reinf
The issue is non galv bars in a precast girder having galvanised bottom rfg in contact... lots of concrete cover and the bridge deck would likely work in the event the bottom rfg disappeared at the support.
Dik
RE: HDG Reinf in contact with Black Reinf
RE: HDG Reinf in contact with Black Reinf
It is generally preferred to use the same materials throughout to reduce corrosion where there may be differential alkalinity and chloride ion concentrations between the top and bottom bar locations. One of the reasons top bars can corrode faster is the grounding of electrons through the bottom bars, allowing the top bars to corrode by way of a macrocell. NEVER use epoxy bars in combination with uncoated bars for this reason.
RE: HDG Reinf in contact with Black Reinf
ACI Chapter 12 gives coating factor for uncoated reinforcement and epoxy-coated bars. What coating factor would you use to determine the development and splice lengths of HDG bars?
RE: HDG Reinf in contact with Black Reinf
RE: HDG Reinf in contact with Black Reinf
RE: HDG Reinf in contact with Black Reinf
The rebar located on the bottom is less likely to experience carbonation and the chloride intrusion will be minimal. I wasn't concerned about it, but some others were.
Dik