FRP rebar or fiber reinforced polymer rebar does not corrode in concrete and so it is an important alternative to steel rebar. This rebar can be made with glass, basalt, or carbon fibers surrounded by a plastic matrix.
This video talks about the benefits and challenges with FRP. However, FRP is not widely used for several reasons. The biggest challenges are the decreased stiffness and lack of strain before fracture. There are also concerns with fire and long term deflections. The video gives solutions on how to overcome many of these issues but it will require an increase in the cost of the concrete. Finally, the video talks about carbon FRP and the significant potential that it has once the price decreases.
The calculations for basalt rebar are based on properties given here: https://www.build-on-prince.com/basal...

The cost of carbon FRP is based on prices from Alibaba in comparison to costs of steel rebar in the US for an equivalent concrete slab. This number will be different for other members but the point is that carbon FRP is a lot more expensive. I am sure it will come down in the future.

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A huge thanks to Hailey Goodale, my director of awesome, for editing this video.