what the best type of fiber that added to the concrete to improve the concrete performance at extreme temperature specially the spalling of the concrete cover ? and why ?,
Glass fiber concrete has a better fire resistant characteristics.
Polymer fiber concrete and steel fiber
Polymer fiber melting at high temperatures that provide open channel to water evaporation .
Steel fiber hold the crack that can be occur during heat.
thanks Rana Burhan Alshahwany
You can also try basalt fibers as it has high fire resistance coupled with being cheap and a green material
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