Concrete , fireproofing materials

In Japan, the lessons learned Irom the complete destruction of several eities by fire during World War II, led to a building standard law that was established in 1950 in which fireproofing of eities was mandated. Since then, fireproof materials such as concrete are the major building materials. However, with a fourth modification of the building standard law in 1963, eonstruction of skyscrapers became possible. Buildings made of steel rather than concrete then dominated. 

Steel stmctures should be protected by approved fireproofing treatment, eg, concrete or insulating, ie, intumescent or ablative materials untreated steel should be protected by some method of cooling, eg, a water-spray system. 

Cementitious materials use a hydraulically setting cement such as Portland cement as a binder with a filler material of good insulation properties, e.g., verminculite, perlite, etc. Concrete us frequently used for fireproofing because it is easily installed, readily available, is quite durable and generally economical compared to other methods. It is heavy compared to other materials and requires more steel to support that other methods. 

Material should be stored only in masonry or fireproof sprinkled buildings on skids or pallets on concrete floors with at least 1 ft clearance from walls. 

FIGURE 19.1 Absorptivity of some materials as a function of temperature (1, fireproof clay, white 2, aluminum 3, wood 4, cork 5, asbestos 6, porcelain 7, concrete 8, graphite 9, roofing silvers). 

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