The shininess goes away, it gets dull and/or even whitish. The zinc coating (galvanize coating) is there to prevent rust, but yes it will eventually oxidize enough that it no longer protects the steel. The ideal exposure time would of course vary with your weather conditions.
at last, something i can leave out in the rain with a benefit! does it look different when it oxidizes? presumeably it would be counter productive if it goes all the way to rust?
On Mon, Feb 11, 2013 at 6:46 AM, spaceman <Spaceman@starship-enterprises.net> wrote:
The people using ferrocement say that if you leave your galvanized wire/mesh sitting out in the weather for a while then the zinc oxidizes and that coating prevents the reaction between the cement and the zinc.
I used weathered galvanized stucco mesh as one side of slip forms for papercrete. After several years there is no visible reaction. YMMV
spaceman
On 2/11/2013 4:39 AM, eo greensticks wrote:
it is my understanding that 'galvanic currents' between the galv and Something in the portland cement result in the
structure inevitably being weakened over time. not good.
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