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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