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______________ is a non combustible building material, but it is a good conductor of heat and hence, it is rapidly heated in case of a fire.(a) Glass(b) Brick(c) Limestone(d) SteelThis question was addressed to me in quiz.This key question is from Fire Protection in section Fire Protection in Building, Carpentry and Joinery of Construction & Building Materials

Answer»

The CORRECT CHOICE is (d) STEEL

Easy explanation: It is found that the Steel loses its tensile strength with the increase in the heat and yield stress of mild steel at 600°C is about ONE third of its value at normal temperature. Hence, under intense fire, the unprotected steel BEAMS sag, unprotected Steel column buckle and structure collapse.



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