https://www.youtube.com/watch?v=65vfMUP4-i8
12 minute video
steel rebar in concrete will rust when pH is below 10
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per YT commenter
Concrete can be easily protected from water and chloride intrusion
using specialty admixtures which significantly lower the porosity of
concrete. In fact concrete can be designed to have a permeability
reaching that of granite which is ultra low. Unfortunately code
officials, general contractors and owners won't spend the relatively
small amount of money to make highly durable concrete. Per your
examples, not all of the concrete in the building needs this level of
protection. It's only needed in areas directly exposed to these
corrosive environments. I've made concrete that's completely
impervious to gases like is required in mining applications. It only
added about $12 per yard on top of $115 per yard concrete. It's
unfortunate that it takes a tragedy to even start a conversation about
this. You're doing great work on this channel and keep it up.
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