Both basalt rebar and fiberglass rebar are varieties of composite reinforcement. Their manufacturing process is the same; the only difference is raw material: the first one is made of basalt fiber, the second one – glass fiber.
In terms of technical features, the only difference between basalt rebar and GFRP bars is the temperature limit, which a particular material is able to withstand. Fiberglass rebar and mesh does not lose its properties at temperatures up to 200 °C, while basalt reinforcement – up to 400 °C.
Basalt rebar is much more expensive. Therefore, taking into account the same technical features, basalt plastic reinforcement should be preferred only in cases when the temperature limit over 200 °C is essential for your facility.
It is believed that the difference between the thermal tolerance of materials is not importan since both types of fibers are coated with the same compound when producing. Thermal tolerance of this compound is more important than the fibef. Therefore, there is no difference between the use of fiberglass and basalt rebar.