(June 26, 2021 at 10:36 pm)Fireball Wrote:(June 26, 2021 at 9:46 pm)Neo-Scholastic Wrote: My guess for the miami condo collapse...the original mix contained alkali add mixtures and secondary repairs were missing either epoxy coated rebar or did not embed diodes.
There is a lot of wrong to unpack here. I'd like for you to expand on the epoxy coated rebar and "embed" diodes. What the actual fuck are "embed diodes"?
In the 1970s it was very common to add chemicals to concrete mixes in order to improve cure times. But if the surface of the concrete is compromosed allowing moisture to reach the steel reinforcing those latent chemicals become corrosive. When a repair is made you cut out the spalled part and replace with new. The new rebar must be epoxy coated to protect the new steel. Also there is a very slight electrical charge between the old and the new so in large areas we install what we call hockey pucks. They are small sacraficial diodes that counteract the charge.
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