I know that a special type of fiberglass is needed for GFRC, due to the acidity in cement, and it will eat away the glass.
What about carbon fiber? Being a bit more inert than glass I think, would one still have the same issues? This is my main question, so discard the issues of wetout, etc.
I have patch jobs, and I have tons of carbon scrap.
There is a concrete repair company here in Phoenix that uses carbon fiber in cement repairs.