Concrete is not inflammable. It cannot burn any more than a stone can burn. In fact, concrete is composed of cement (a derivative from stone), sand (which is a form of small stone) and aggregate (stones). If concrete is subjected to very high temperatures of many hundreds of degrees centigrade for a long time, it will decompose. However, such extreme temperatures are not reached in an average fire. In addition, it has been demonstrated that concrete walls are more resistant to the passage for fire from one side to the other, which is of special significance in high or joined buildings.

resistencia al fuego
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