Galvanized pipe to concrete riser

Question

Galvanized pipe to concrete riser

dsspe (Civil/Environmental)

(OP)

11 Nov 21 16:27

I seem to remember an advisory against connecting galvanized pipe to a concrete riser citing something about zinc reacting with portland cement. At my age the memory can be nearly useless but does anyone have any advice on this?

bridgebuster (Civil) · Answer 1 · 2021-11-15 16:14:22

we connect galvanized riser pipes to concrete bridge piers and abutments on a regular basis. Also, we use galvanized rebars in bridge decks.

BenMacier (Mechanical) · Answer 2 · 2021-11-18 04:12:15

Bridgebuster forgot to mention that these pipes and rebars are electrically connected to be at same potential and often connected to a cathodic protection system to monitor and prevent their corrosion.

Note: you are referring to a cold service zinc pipe, not hot one?

* Finding a solution is great * Knowing how to implement it is fantastic * Believing it is the only one and best is naive ?

dsspe (Civil/Environmental) · Answer 3 · 2021-11-18 15:27:27

Thank you both. The pipe is a low flow drain in a stormwater management pond to be connected to a riser/outlet structure. Your replies are most helpful.

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Galvanized pipe to concrete riser