Burnt bricks are used so that the building remains intact in case of a fire; burnt bricks don't burn.
Burnt bricks are stronger and they are water-proof. Unburned bricks are just as fireproof (and may turn into burnt bricks after a serious fire)
Baked bricks are more durable. The organic materials are burnt out and the hydrated substances are de-hydrated. The silica becomes glassy at high enough temperatures.
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