Question: A long concrete beam with a rectangular cross-section measuring 8 12 in. is exposed to a temperature of 1,500F in a fire. Using Newmans

A long concrete beam with a rectangular cross-section measuring 8

× 12 in. is exposed to a temperature of 1,500°F in a fire. Using Newman’s rule, determine the time of exposure needed for the temperature at the center of the beam to reach 700°F if the beam is at an initial temperature of 70°F. The thermal diffusivity of the concrete beam is 0.018 ft²/h.

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