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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.

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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) Steel

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This key question is from Fire Protection in section Fire Protection in Building, Carpentry and Joinery of Construction & Building Materials

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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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